15 Best 40V String Trimmers, Compared
As an Amazon Associate we earn from qualifying purchases. Links on this page are affiliate links.
Finding the best 40V string trimmers requires looking at the hard numbers. We compared 15 models based strictly on published specifications. The Greenworks 40V 12-Inch Trimmer and Blower Combo leads because it includes a 390 CFM blower in the same kit. This dual-function setup handles residential yard cleanup efficiently. Each tool here shares a 40V voltage rating, but cutting widths vary from 12 to 20 inches. You need to match the cutting path and weight to your yard size. This guide helps you decide which tool fits your maintenance needs.
Quick picks
The best fit for you
- You want the most compact trimmer on the list BLACK+DECKER 40V 13-Inch String Trimmer and Edger The BLACK+DECKER model weighs only 7.8 pounds, making it the lightest option.
- You need a wide 15-inch cutting path WORX 40V 15-Inch Trimmer and Blower Combo The WORX combo offers a 15-inch cutting width for faster clearing.
- You want the widest trimming coverage available RYOBI 40V 17-Inch Carbon Fiber String Trimmer The RYOBI carbon fiber shaft provides a broad 17-inch cutting path.
Our 15 picks
Greenworks 40V 12-Inch Trimmer and Blower Combo
Best for: combined trimming and blowing on residential yards
- Voltage
- 40V (what this guide is about)
- Cutting Swath
- 12 in
- Power Source
- battery
- Line Feed System
- auto-feed
- Battery Capacity
- 2.0Ah
- Cutting Width
- 12-Inch
View on Amazon: Greenworks 40V 12-Inch Trimmer and Blower Combo
This package pairs a 40V cordless string trimmer with a 390 CFM leaf blower and a 2.0 Ah battery. The trimmer provides a 12-inch cutting swath with an automatic line feed system utilizing 0.065-inch line. You also receive a matching blower delivering air speeds up to 110 MPH with cruise control. It suits you if you need a matching yard cleanup set to manage edges and blow debris on standard residential lots.
Pros
- Includes 12-inch trimmer and 390 CFM, 110 MPH leaf blower
- Includes 40V 2.0 Ah battery with 60-minute charge time
- Auto-feed line system uses 0.065-inch trimmer line
- Leaf blower includes built-in cruise control
Cons
- 12-inch cutting swath is narrower than 13-inch to 17-inch models
- 2.0 Ah battery offers less run capacity than 4.0 Ah alternatives
- Uses 0.065-inch line rather than heavier 0.095-inch line
Good fit if
- You want both a string trimmer and a blower that share one 40V battery.
- You prefer an automatic feed head using standard 0.065-inch line.
- You need a compact 12-inch cut width for tight spaces around walkways.
Skip if
- You need a wider cutting width than 12 inches for open spaces.
- You require heavy-duty 0.095-inch trimmer line for thick brush.
- You only need a dedicated trimmer without an extra leaf blower.
Verdict: Greenworks 40V 12-Inch Trimmer and Blower Combo delivers an all-in-one trimming and blowing setup powered by an interchangeable 40V 2.0 Ah battery. It provides a compact 12-inch cutting width and auto-feed line management for general yard cleanup.
WORX 40V 15-Inch Trimmer and Blower Combo
Best for: trimming and blowing medium to large yards
- Voltage
- 40V (what this guide is about)
- Cutting Swath
- 15 in
- Power Source
- battery
- Shaft Type
- carbon fiber
- Cutting Width
- 15-Inch
- Dimensions
- 12.4 × 8.62 × 38.4 inches
This 40V kit pairs a 15-inch cordless string trimmer with a 530 CFM leaf blower, running on two 20V PowerShare batteries. The trimmer features a lightweight carbon fiber shaft to help manage balance across medium to large yards. You get a complete cleanup setup with an included dual charger and extra spool, making it a practical match if you need both trimming width and yard-clearing airflow in one package.
Pros
- 15-inch cutting swath covers larger yard areas
- Carbon fiber shaft provides reduced weight and balance
- Includes 530 CFM leaf blower rated at 57 dB
- Ships with two batteries and a dual-port charger
Cons
- Total kit weight listed at 20 pounds
- Requires two 20V batteries simultaneously for 40V operation
Good fit if
- You need both a 15-inch string trimmer and a leaf blower in one system.
- You want a trimmer equipped with a carbon fiber shaft for improved control.
- You already use or plan to expand into the Worx PowerShare battery platform.
Skip if
- You only need a standalone string trimmer without an extra leaf blower.
- You prefer a dedicated single 40V battery rather than two combined 20V packs.
Verdict: Worx 40V 15-Inch Trimmer and Blower Combo delivers a wide cutting path and high-volume post-mow clearing using a shared dual-battery platform. It is a capable two-in-one yard maintenance solution for medium to large lawns.
Greenworks 40V 13-Inch Cordless String Trimmer
Best for: multi-angle trimming and lawn border edging
- Voltage
- 40V (what this guide is about)
- Cutting Swath
- 13 in
- Power Source
- battery
- Shaft Type
- telescoping
- Battery Capacity
- 2.0Ah
- Cutting Width
- 13-Inch
View on Amazon: Greenworks 40V 13-Inch Cordless String Trimmer
This Greenworks 40V string trimmer provides a 13-inch cutting swath and runs on an included 2.0 Ah battery. It features a telescoping shaft that adjusts between 40 and 52 inches, along with a seven-position pivoting head for quick conversion to an edger. If you need a versatile tool to detail borders, trim under low structures, and manage standard turf, this model serves you well.
Pros
- 7-position pivoting head with integrated steel edging guide
- Telescoping shaft adjusts from 40 to 52 inches
- Includes 40V 2.0 Ah battery and charger
- Operates at a rated 78 dB sound level
Cons
- 13-inch cutting swath is narrower than 15-inch alternatives
- Uses single 0.065-inch diameter trimmer line
Good fit if
- You want an adjustable shaft length between 40 and 52 inches.
- You need a pivoting head to edge borders and trim under obstacles.
- You prefer a quiet 78 dB operating noise rating.
Skip if
- You need a cutting width wider than 13 inches for large lots.
- You require line thicker than 0.065 inches for dense brush.
Verdict: Greenworks 40V 13-Inch Telescoping String Trimmer delivers versatile trimming and edging via its seven-position pivoting head. The adjustable shaft accommodates different user heights for balanced yard maintenance.
BLACK+DECKER 40V 13-Inch String Trimmer and Edger
Best for: trimming and edging with automatic line feed
- Voltage
- 40V (what this guide is about)
- Cutting Swath
- 13 in
- Power Source
- battery
- Line Feed System
- automatic
- Battery Capacity
- 2.0Ah
- Cutting Width
- 13-Inch
View on Amazon: BLACK+DECKER 40V 13-Inch String Trimmer and Edger
This cordless tool gives you a 13-inch cutting swath powered by a 40V 2.0Ah lithium-ion battery. You can switch between trimming and edging, adjust shaft length with the telescoping pole, and dial speed up to 8,500 RPM. Line feeds automatically without bumping. The 7.8-pound build and dual-mode functionality suit you if you maintain small to medium borders and want one tool for cutting grass and edging borders.
Pros
- Converts from string trimmer to edger in seconds
- Automatic Feed Spool advances line without bumping
- PowerCommand dial toggles between maximum power and extended runtime up to 8,500 RPM
- Included fast charger restores battery power in 2 hours or less
Cons
- 13-inch cutting swath is narrower than 15-inch or 16-inch alternatives
- 2.0Ah battery capacity provides less runtime than larger 4.0Ah packs
Good fit if
- You want a single tool that switches between string trimming and lawn edging
- You prefer an automatic line feed system over manual bump heads
- You need an adjustable telescoping shaft to match your height
Skip if
- You need a wider cutting swath of 15 inches or more for thick, open brush
- You require extended continuous runtime beyond what a 2.0Ah battery supplies
Verdict: BLACK+DECKER 40V 13-Inch String Trimmer and Edger combines trimming and edging functions with bump-free line feeding and a 2-hour recharge cycle. It gives you flexible yard maintenance in a 7.8-pound frame without requiring separate equipment.
WORX 15-Inch Brushless 40V String Trimmer
Best for: heavy clearing with thick dual line
- Voltage
- 40V (what this guide is about)
- Cutting Swath
- 15 in
- Motor Type
- brushless
- Line Feed System
- bump feed
- Battery Capacity
- 4.0Ah
- Cutting Width
- 15-Inch
The WORX 15-Inch Brushless 40V String Trimmer gives you a wide 15-inch cutting swath powered by a brushless motor. It runs on 4.0 Ah batteries and feeds 0.095-inch line through a dual-exit bump-feed head. Variable speed control lets you adjust cutting output based on grass thickness. At 9.42 pounds, it suits you if you need heavy-duty cutting capability and broad reach for dense lawn growth.
Pros
- 15-inch cutting swath with 0.095-inch dual-exit line
- Brushless motor paired with variable speed control
- Easy-load bump-feed head avoids disassembly to spool line
- Runs on 4.0 Ah WORX Power Share battery system
Cons
- Tool weight is 9.42 pounds
- Shaft length of 68.3 inches requires substantial storage space
Good fit if
- You need a wide 15-inch cutting swath and thick 0.095-inch dual line for dense weeds.
- You want variable speed regulation to balance cutting power and runtime.
- You already own or plan to use WORX Power Share equipment.
Skip if
- You want a lighter tool under 9 pounds to minimize handling fatigue.
- You have limited storage space that cannot fit a 68.3-inch length.
Verdict: WORX 15-Inch Brushless 40V String Trimmer provides high-output yard clearing using heavy-gauge dual line and an efficient brushless motor. It is built for larger cutting jobs where a 15-inch path and adjustable speed settings are necessary.
Worx 13-Inch 40V Cordless String Trimmer
Best for: lightweight trimming on the Power Share system
- Voltage
- 40V (what this guide is about)
- Cutting Swath
- 13 in
- Power Source
- battery
- Line Feed System
- automatic
- Battery Capacity
- 2.0 Ah
- Cutting Width
- 13-Inch
This cordless grass trimmer runs on two 20V 2.0Ah batteries to deliver 40V power across a 13-inch cutting swath. At 6.4 pounds, it features a dual-exit head and an automatic line-feed spool system to maintain continuous cutting without manual tapping. An adjustable auxiliary handle helps you tailor the balance. It suits you if you need a lightweight 40V yard trimmer compatible with the Worx Power Share battery platform.
Pros
- Weighs 6.4 pounds for reduced fatigue
- Dual-exit head with automatic line-feed spool
- Includes two 20V 2.0Ah batteries and a dual-port charger
- Adjustable auxiliary handle for customized grip
Cons
- 13-inch cutting swath is narrower than 15-inch or 16-inch models
- Requires managing two 20V batteries simultaneously for 40V operation
Good fit if
- You want a lightweight 40V trimmer weighing under 7 pounds.
- You already use Worx Power Share tools sharing the 20V battery format.
- You prefer automatic line advancement over bump feeding.
Skip if
- You need a wider 15-inch or 16-inch cutting swath for faster coverage.
- You prefer a single dedicated 40V battery rather than two 20V packs.
Verdict: Worx 13-Inch 40V Cordless String Trimmer delivers 40V performance at an approachable 6.4-pound weight using two 20V batteries. Its dual-exit automatic line feed and adjustable handle provide straightforward yard maintenance.
Greenworks 40V 16-Inch String Trimmer
Best for: wide trimming coverage and multi-tool yard setups
- Voltage
- 40V (what this guide is about)
- Cutting Swath
- 16 in
- Power Source
- Battery
- Motor Type
- Brushless
- Battery Capacity
- 4.0 Ah
- Cutting Width
- 16-Inch
This 40V string trimmer gives you a wide 16-inch cutting swath paired with a brushless motor and an included 4.0 Ah battery. It features two speed settings with a variable-speed trigger to balance power and runtime across your yard. Because it accepts optional multi-tool attachments, you can expand its capabilities beyond trimming. It suits you if you need wide coverage and attachment capability in one 40V platform.
Pros
- Wide 16-inch cutting swath
- Brushless motor with 2-speed selection and variable-speed trigger
- Compatible with edger, hedge trimmer, polesaw, cultivator, and blower attachments
- Includes 4.0 Ah 40V battery
Cons
- Total weight is 15.2 pounds
- Additional tool attachments sold separately
Good fit if
- You need a wide 16-inch cutting path to clear larger areas quickly.
- You want a multi-tool base compatible with Greenworks PAC-series attachments.
- You want an included 4.0 Ah battery for your 40V yard gear.
Skip if
- You prefer an ultra-light trimmer under 15 pounds.
- You only need a dedicated trimmer without attachment compatibility.
Verdict: Greenworks 40V 16-Inch Brushless String Trimmer pairs broad cutting coverage with attachment capability and a 4.0 Ah pack. It is a solid choice when you want multi-tool flexibility on a 40V battery platform.
BLACK+DECKER 40V Trimmer and Sweeper Combo
Best for: bundled trimming and hard-surface sweeping tasks
- Voltage
- 40V (what this guide is about)
- Power Source
- battery
- Line Feed System
- automatic feed spool
- Included Battery
- Battery and Charger Included
- Dimensions
- 10.9 × 7.5 × 40.9 inches
- Weight
- 11 pounds
This BLACK+DECKER combo pairs a 40V cordless string trimmer and edger with a 130 MPH sweeper, battery, and charger. The trimmer uses an automatic feed spool system to advance line without bumping, while the high-torque transmission handles clean cuts. A built-in battery indicator shows remaining charge during yard work. You get two 40V tools in an 11-pound package for trimming lawn edges and clearing hard surfaces.
Pros
- Includes 40V battery, charger, string trimmer, and sweeper
- Automatic feed spool advances trimmer line without bumping
- Battery features an integrated state-of-charge indicator
- Sweeper delivers wind speeds up to 130 MPH
- Covered by a 2-year limited warranty
Cons
- Trimmer cutting swath diameter is not specified
- Sweeper air volume rating in CFM is not provided
Good fit if
- You want a matched 40V trimmer and sweeper setup with the battery and charger included.
- You prefer an automatic feed line mechanism over a manual bump system.
- You want an onboard battery gauge to check runtime while working.
Skip if
- You already have compatible 40V batteries and prefer buying a bare tool.
- You need verified cutting swath measurements before deciding.
Verdict: BLACK+DECKER 40V String Trimmer and Sweeper Combo supplies an automatic feed trimmer and a 130 MPH sweeper in one kit. It covers post-mowing trimming and hard-surface clearing with the included battery and charger.
BLACK+DECKER 40V 13-Inch String Trimmer and Edger
Best for: trimming and edging smaller suburban lawns
- Voltage
- 40V (what this guide is about)
- Cutting Swath
- 13 in
- Power Source
- battery
- Line Feed System
- automatic
- Cutting Width
- 13-Inch
- Application
- Lawn
View on Amazon: BLACK+DECKER 40V 13-Inch String Trimmer and Edger
This cordless tool runs on a 40V battery system and provides a 13-inch cutting swath. It converts between trimming and edging setups and features an automatic line feed system to eliminate manual spool tapping. At 6.4 pounds, it includes a battery status indicator and a wall-mountable charger. It suits you if you maintain small to medium lawns and prioritize lightweight handling with built-in power monitoring.
Pros
- Weighs 6.4 pounds for low-effort handling
- Automatic line feeding avoids manual spool bumping
- Battery includes an integrated state-of-charge indicator
- Converts quickly between trimming and edging modes
- Wall-mountable charging base saves storage space
Cons
- 13-inch cutting swath covers less area per pass than 15-inch options
- Fixed cutting width offers no wider swath adjustment
Good fit if
- You need a single tool that converts between trimming and edging.
- You want a lightweight 40V unit weighing under seven pounds.
- You prefer automatic line feed over bump feed systems.
Skip if
- You require a wide 15-inch or larger cutting path for rapid clearing.
- You already use a different brand's 40V battery platform.
Verdict: BLACK+DECKER 40V 13-Inch Trimmer and Edger delivers dual-function trimming and edging in a 6.4-pound package with automated line feeding. It provides dependable power monitoring and convenient wall storage for standard yard maintenance.
RYOBI 40V 15-Inch Attachment Capable String Trimmer
Best for: RYOBI 40V owners needing modular attachment versatility
- Voltage
- 40V (what this guide is about)
- Cutting Swath
- 15 in.
- Cutting Width
- 15-Inch
- Included Battery
- Tool Only
- Shaft Type
- Attachment Capable
- Dimensions
- 40 × 13 × 5 inches
View on Amazon: RYOBI 40V 15-Inch Attachment Capable String Trimmer
This RYOBI 40V cordless string trimmer features a 15-inch cutting swath and an EXPAND-IT attachment-capable shaft. It weighs 11 pounds and runs for up to 71 minutes when paired with a 40V 4Ah battery. Because this bare tool ships without a battery or charger, it suits you best if you already own compatible RYOBI 40V power equipment and want modular yard tool versatility.
Pros
- EXPAND-IT attachment-capable shaft accepts modular tool heads
- Wide 15-inch cutting swath
- Up to 71 minutes of runtime with a 40V 4Ah battery
- Power output rated above a 21cc gas engine
Cons
- Bare tool ships without a battery or charger
- Weighs 11 pounds before adding a battery
Good fit if
- You already own compatible RYOBI 40V batteries and a charger.
- You want an attachment-capable shaft to swap in other yard tools.
- You need a wide 15-inch cutting width for larger trimming jobs.
Skip if
- You need a bundled battery and charger out of the box.
- You want a bare tool that weighs less than 11 pounds.
Verdict: RYOBI 40V 15-Inch Attachment Capable String Trimmer provides solid gas-replacement cutting power and modular EXPAND-IT versatility for your yard. Its 11-pound bare weight requires existing 40V RYOBI batteries to get to work.
PowerSmart 40V 20-Inch Mower and 13-Inch Trimmer Combo
Best for: Lawn care bundles requiring mower and trimmer
- Voltage
- 40V (what this guide is about)
- Cutting Swath
- 13 in
- Power Source
- battery
- Motor Type
- brushless
- Line Feed System
- auto-feed
- Battery Capacity
- 4.0Ah
View on Amazon: PowerSmart 40V 20-Inch Mower and 13-Inch Trimmer Combo
This combo kit pairs a 13-inch string trimmer and edger with a 20-inch self-propelled lawn mower. Both tools run on the PowerSmart 40V platform and share two included 4.0Ah batteries and a charger. The trimmer features an auto-feed system, dual-speed control, and a 180-degree rotating head for edging. It suits you if you need to set up your primary mowing and trimming gear with matching power packs.
Pros
- Includes both a 20-inch self-propelled mower and a 13-inch trimmer
- Comes with two 4.0Ah batteries and one charger
- 180-degree rotating trimmer head with dual-speed control and auto-feed
- Includes three replacement spools and a grass bag
Cons
- Ships in two separate packages
- Trimmer cutting swath is limited to 13 inches
- Total kit weight reaches 60 pounds
Good fit if
- You want a matched 40V system covering both lawn mowing and trimming.
- You prefer an auto-feed trimmer head with 180-degree rotation for edging.
Skip if
- You only need a string trimmer and already own a mower.
- You require a trimming cutting swath wider than 13 inches.
Verdict: PowerSmart 40V 20-Inch Mower and 13-Inch Trimmer Combo delivers a complete yard care setup powered by shared 4.0Ah batteries. It equips you with a self-propelled mower alongside a dual-speed rotating trimmer.
Greenworks 40V 16-Inch Brushless String Trimmer
Best for: Greenworks 40V owners needing a wide trimmer
- Voltage
- 40V (what this guide is about)
- Cutting Swath
- 16 in
- Power Source
- Battery
- Motor Type
- Brushless
- Line Feed System
- Bump feed
- Cutting Width
- 16-Inch
View on Amazon: Greenworks 40V 16-Inch Brushless String Trimmer
This bare-tool Greenworks string trimmer runs on a 40V battery platform and features a 16-inch cutting swath. It uses a brushless motor, a two-speed selector with a variable-speed trigger, and dual 0.095-inch bump-feed line. It also connects to optional multi-tool attachments. Because it ships without a battery and charger, it suits you best if you already own compatible Greenworks 40V gear.
Pros
- Wide 16-inch cutting swath
- Brushless motor with two speed settings and variable-speed trigger
- Dual-line bump feed head using 0.095-inch line
- Attachment capable for compatible edger, blower, pole saw, and cultivator add-ons
Cons
- Battery and charger are not included
- Total tool weight is 11.3 pounds
Good fit if
- You already own a compatible Greenworks 40V battery and charger.
- You want a wide 16-inch cutting path with 0.095-inch trimmer line.
- You plan to use compatible multi-tool attachments.
Skip if
- You need a battery and charger included in the box.
- You prefer a lighter string trimmer than this 11.3-pound model.
Verdict: Greenworks 40V 16-Inch Brushless String Trimmer delivers a wide 16-inch cutting path and attachment versatility for yards on the Greenworks 40V platform. It is an efficient bare-tool upgrade if you already own compatible batteries.
RYOBI 40V 17-Inch Carbon Fiber String Trimmer
Best for: wide trimming passes with a carbon fiber shaft
- Voltage
- 40V (what this guide is about)
- Cutting Swath
- 17 in
- Power Source
- Battery
- Motor Type
- Brushless
- Shaft Type
- Carbon fiber
- Included Battery
- Tool Only
View on Amazon: RYOBI 40V 17-Inch Carbon Fiber String Trimmer
This cordless string trimmer runs on a 40V battery platform and features a brushless motor paired with a 17-inch cutting swath. It uses a carbon fiber shaft to balance its 12-pound weight and measures 36 inches in length. Sold as a bare tool without an included battery or charger, this trimmer suits you if you already own compatible 40V batteries and want a wide cutting path.
Pros
- Wide 17-inch cutting swath
- Lightweight carbon fiber shaft
- Brushless motor
- 40V battery-powered operation
Cons
- Battery and charger not included
- Tool weighs 12 pounds before adding a battery
Good fit if
- You already own compatible 40V batteries and chargers.
- You want a wide 17-inch cutting swath to cover more ground per pass.
- You prefer the rigidity of a carbon fiber shaft.
Skip if
- You need a bundled battery and charger out of the box.
- You want a tool that weighs less than 12 pounds.
Verdict: RYOBI 40V 17-Inch Carbon Fiber String Trimmer offers a broad 17-inch cut and a carbon fiber shaft for trimming dense growth. It serves as a direct bare-tool upgrade if you are already invested in the 40V lineup.
DongCheng 40V Brushless 15-Inch String Trimmer
Best for: Users with existing 20V DongCheng batteries
- Voltage
- 40V (what this guide is about)
- Cutting Swath
- 15 in
- Power Source
- battery
- Motor Type
- brushless
- Battery Capacity
- 4.0Ah
- Cutting Width
- 15-Inch
View on Amazon: DongCheng 40V Brushless 15-Inch String Trimmer
This DongCheng trimmer uses a dual-battery system to deliver 40V power from two 20V 4.0Ah packs. It features a brushless motor spinning at 6000 RPM and a 15-inch cutting swath. The tool weighs 7.3 pounds and includes an adjustable handle for ergonomic control. You get up to 45 minutes of runtime on low speed with a one-hour recharge. It is well-suited for users who already own 20V DongCheng tools or want high torque in a lightweight design.
Pros
- Brushless motor for efficient power delivery
- 15-inch cutting width for faster coverage
- Dual 20V 4.0Ah batteries provide 40V output
- Lightweight 7.3-pound design reduces fatigue
Cons
- Requires two separate batteries to operate
- Battery and charger are not included in the base kit
- Runtime is limited to 45 minutes on low speed
Good fit if
- You already use the 20V DongCheng battery platform
- You want a lightweight trimmer for extended use
- You prefer high RPM for tough weeds
Skip if
- You need a single integrated 40V battery system
- You want a tool-only purchase without needing extra batteries
- You require more than 45 minutes of continuous runtime
Verdict: DongCheng 40V Brushless 15-Inch Trimmer fits users who already own 20V DongCheng batteries and need a lightweight, high-RPM tool for efficient trimming.
Makita 40V max Brushless 15" String Trimmer
Best for: existing Makita 40V XGT system owners
- Voltage
- 40V (what this guide is about)
- Cutting Swath
- 15 in
- Power Source
- Battery
- Motor Type
- Brushless
- Battery Capacity
- 4.0Ah
- Cutting Width
- 15-Inch
This Makita cordless string trimmer runs on a 40V max platform and features a brushless outer rotor motor with a 15-inch cutting swath. It delivers variable operating speeds between 3,500 and 6,500 RPM using automatic torque drive technology to adjust power under load. Because it comes as a bare tool without a battery or charger, it suits you best if you already own compatible Makita 40V XGT gear.
Pros
- Outer rotor brushless motor delivers up to 6,500 RPM
- Wide 15-inch cutting swath
- Automatic torque drive shifts speed between 3,500 and 6,500 RPM
- Up to 1 hour run time with a 4.0Ah battery
Cons
- Sold as a bare tool without battery or charger included
- Incompatible with standard Makita 18V LXT batteries
Good fit if
- You already own Makita 40V max XGT batteries and chargers.
- You need a 15-inch cutting swath with automatic speed adjustment.
Skip if
- You need an all-in-one kit that includes a battery and charger.
- You want a trimmer compatible with 18V power tool systems.
Verdict: Makita 40V max Brushless 15" String Trimmer delivers strong cutting output with automatic speed regulation across a 15-inch path. It is a capable bare-tool option if you already use the 40V XGT battery platform.
Specifications side by side
| Spec | Greenworks 40V 12-Inch Trimmer and Blower Combo | WORX 40V 15-Inch Trimmer and Blower Combo | Greenworks 40V 13-Inch Cordless String Trimmer | BLACK+DECKER 40V 13-Inch String Trimmer and Edger | WORX 15-Inch Brushless 40V String Trimmer | Worx 13-Inch 40V Cordless String Trimmer | Greenworks 40V 16-Inch String Trimmer | BLACK+DECKER 40V Trimmer and Sweeper Combo | BLACK+DECKER 40V 13-Inch String Trimmer and Edger | RYOBI 40V 15-Inch Attachment Capable String Trimmer | PowerSmart 40V 20-Inch Mower and 13-Inch Trimmer Combo | Greenworks 40V 16-Inch Brushless String Trimmer | RYOBI 40V 17-Inch Carbon Fiber String Trimmer | DongCheng 40V Brushless 15-Inch String Trimmer | Makita 40V max Brushless 15" String Trimmer |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Voltage | 40V | 40V | 40V | 40V | 40V | 40V | 40V | 40V Max | 40V | 40V | 40V | 40V | 40V | 40V | 40V max |
| Cutting Swath | 12 in | 15 in | 13 in | 13 in | 15 in | 13 in | 16 in | not specified | 13 in | 15 in. | 13 in | 16 in | 17 in | 15 in | 15 in |
| Power Source | battery | battery | battery | battery | not specified | battery | Battery | battery | battery | not specified | battery | Battery | Battery | battery | Battery |
| Motor Type | not specified | not specified | not specified | not specified | brushless | not specified | Brushless | not specified | not specified | not specified | brushless | Brushless | Brushless | brushless | Brushless |
| Shaft Type | not specified | carbon fiber | telescoping | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | Carbon fiber | not specified | not specified |
| Line Feed System | auto-feed | not specified | not specified | automatic | bump feed | automatic | not specified | automatic feed spool | automatic | not specified | auto-feed | Bump feed | not specified | not specified | not specified |
| Battery Capacity | 2.0Ah | not specified | 2.0Ah | 2.0Ah | 4.0Ah | 2.0 Ah | 4.0 Ah | not specified | not specified | not specified | 4.0Ah | not specified | not specified | 4.0Ah | 4.0Ah |
| Cutting Width | 12-Inch | 15-Inch | 13-Inch | 13-Inch | 15-Inch | 13-Inch | 16-Inch | not specified | 13-Inch | 15-Inch | 20-Inch | 16-Inch | not specified | 15-Inch | 15-Inch |
| Drive Type | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | Self-Propelled | not specified | not specified | not specified | not specified |
| Mowing Function | not specified | not specified | 2-in-1 | 2-in-1 | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified |
| Application | not specified | not specified | not specified | Lawn | not specified | not specified | not specified | not specified | Lawn | not specified | not specified | not specified | not specified | not specified | not specified |
| Included Battery | not specified | not specified | not specified | not specified | not specified | not specified | not specified | Battery and Charger Included | not specified | Tool Only | not specified | Tool Only | Tool Only | not specified | Tool Only |
| Dimensions | 64.5 × 7.5 × 5 inches | 12.4 × 8.62 × 38.4 inches | 52.7 × 12.9 × 5 inches | 46.5 × 13.5 × 11 inches | 68.3 × 12.8 × 10.7 inches | 63 × 14.7 × 9.1 inches | 65.4 × 11.8 × 5 inches | 10.9 × 7.5 × 40.9 inches | 9 × 40 × 4 inches | 40 × 13 × 5 inches | 32.3 × 18.2 × 20.4 inches | 65.4 × 11.8 × 5 inches | 36 × 12 × 5 inches | 40 × 13.3 × 5 inches | 7.09 × 72.4 × 8.9 inches |
| Weight | 16.5 pounds | 20 pounds | 9.92 pounds | 7.8 pounds | 9.42 pounds | 6.4 pounds | 15.2 pounds | 11 pounds | 6.4 pounds | 11 pounds | 60 pounds | 11.3 pounds | 12 pounds | 7.3 pounds | not specified |
| Size | 40V 12" + 390CFM (2.0Ah) | not specified | New 13" Trimmer (2.0Ah) | 46.5"L x 13.5"W x 11"H | 15" | No Size | 16" Trimmer (4Ah) Gen 2 | One Size | One Size | RY40205 | not specified | 16" Trimmer (Tool Only) Gen 2 | not specified | 15" | 15" |
| Color | Green/Black | Black and Orange | Green Gen 2 (Battery Included) | Orange | Black and Orange | Black and Orange | Green | Orange, Black | Orange | GREEN | Black & Red | Green | LIME GREEN/ BLACK | Blue | Teal |
| Model | STBA40B210 | WP925 | STF314 | LST136 | WG185 | WG183 | ST40L414 | LCC340C | LST140C | RY40205 | MB2420SA-MB2462 | ST40L03 | RY402110VNM | DCPH401+DCST151(EA-04)-01 | GRU01Z |
If you also maintain indoor workspaces, you can compare specifications for the best paper trimmers for office use.
Check weight and shaft length
-
Prioritize lightweight frames
You should check the weight to ensure comfortable handling during extended use. The WORX 13-Inch model weighs just 6.4 pounds, making it the lightest option on the list. A lighter tool reduces fatigue when trimming edges or clearing debris. Heavier units like the PowerSmart combo weigh 60 pounds because they include a mower. For simple trimming tasks, you want the lowest weight to maintain control and balance while you work around your yard.
-
Consider shaft adjustability
You need a shaft that fits your height for proper posture. The Greenworks 13-Inch model features a telescoping shaft with seven positions. This allows you to adjust the length to match your reach. A properly adjusted shaft reduces back strain. You should look for adjustable or telescoping designs if you share the tool with others. Fixed-length shafts work for single users but offer less flexibility for different body types or trimming angles.
-
Look for brushless motors
You should check for brushless motor technology for better efficiency. The WORX 15-Inch Brushless model and the Greenworks 16-Inch Brushless model both use this technology. Brushless motors provide more power and longer runtime compared to brushed alternatives. They also require less maintenance because they have fewer wear parts. If you plan to use your trimmer frequently, choosing a brushless motor ensures consistent performance and extends the life of your tool.
-
Verify battery compatibility
You must ensure the battery fits your existing system. The RYOBI 15-Inch model is sold as a bare tool, meaning you need a separate 40V RYOBI battery. The WORX 13-Inch model uses two 20V batteries to create 40V power. You should check the included battery capacity, such as the 4.0 Ah pack in the Greenworks 16-Inch model. If you already own batteries from a specific brand, choose a trimmer that uses those same batteries to save money and reduce clutter.
-
Check cutting width needs
You should match the cutting width to your yard size. The Greenworks 16-Inch model offers a 16-inch path for faster coverage on larger lawns. The WORX 15-Inch model provides a 15-inch width for medium yards. Smaller yards may only need the 12-inch or 13-inch width found in other models. A wider path clears more grass per pass, reducing the time required to finish your trimming tasks. Choose the width that balances speed with maneuverability around obstacles.
Frequently asked questions
Which 40V string trimmer has the widest cutting path?
The PowerSmart 40V 20-Inch Mower and 13-Inch Trimmer Combo offers the widest 20-inch cutting width on this list. This broad path allows you to clear larger areas of grass and weeds more efficiently in fewer passes. It pairs this wide trimmer with a self-propelled mower for a complete yard care setup.
What is the lightest 40V string trimmer available?
The WORX 13-Inch 40V Cordless String Trimmer weighs just 6.4 pounds. This lightweight design reduces user fatigue during extended trimming sessions or when working on vertical surfaces. It delivers 40V performance while remaining easy to maneuver around tight garden borders and delicate landscaping features.
Does the Greenworks 40V 12-Inch Trimmer include a blower?
Yes, the Greenworks 40V 12-Inch Trimmer and Blower Combo includes a blower attachment. It provides a compact 12-inch cutting width and an auto-feed line management system for general yard cleanup. The included blower generates 390 CFM to clear debris from patios and walkways after trimming.
Are there brushless motor options in this 40V lineup?
Several models feature brushless motors for improved efficiency and durability. The WORX 15-Inch Brushless 40V String Trimmer uses a brushless motor with heavy-gauge dual line. The Greenworks 40V 16-Inch Brushless String Trimmer also utilizes this technology for long-lasting performance. These motors typically offer longer runtimes and require less maintenance.
Which trimmer is best for edging along sidewalks?
The BLACK+DECKER 40V 13-Inch String Trimmer and Edger is designed for dual-function trimming and edging. It features automatic line feeding and a compact 7.8-pound frame for precise control. This model allows you to switch between trimming grass and edging borders without needing separate equipment for each task.
Do I need to buy a battery for the RYOBI trimmer?
Yes, the RYOBI 40V 15-Inch Attachment Capable String Trimmer is sold as a bare tool. It requires existing 40V RYOBI batteries to operate. This setup is ideal for users who already own the RYOBI 40V battery platform and want to add modular attachment versatility to their yard maintenance routine.
Can I use 20V batteries with the WORX 13-Inch trimmer?
Yes, the WORX 13-Inch 40V Cordless String Trimmer operates using two 20V batteries. It utilizes the Power Share system to deliver 40V performance. This design allows you to use existing 20V batteries if you already own them, providing a cost-effective entry point into the WORX cordless ecosystem.
Is there a carbon fiber shaft option for heavy-duty trimming?
The RYOBI 40V 17-Inch Carbon Fiber String Trimmer features a carbon fiber shaft. This material provides a broad 17-inch cut while reducing overall weight. It serves as a direct upgrade for users who need to trim dense growth without the added fatigue of a heavier metal shaft.