40V vs 20V String Trimmers in 2026: Key Differences
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Choosing between a 40V vs 20V string trimmer depends on your power needs and existing tool ecosystem. Both Greenworks and WORX offer battery-powered options that eliminate gas maintenance. They share a 12-inch cutting swath and blower capabilities. The main difference lies in the voltage system and included attachments. You will find distinct advantages in runtime, weight, and accessory variety depending on which platform you select. This comparison focuses on the published specifications to help you decide.
Key differences
| Aspect | Greenworks 40V 12-Inch Trimmer and Blower Combo | WORX WG931 20V 3-in-1 Kit |
|---|---|---|
| Voltage | 40V | 20V |
| Battery Capacity | 2.0Ah | not listed |
| Line Feed System | auto-feed | command feed |
| Additional Tool Included | 390 CFM Blower | 22-Inch Hedge Trimmer |
| Weight | 16.5 pounds | 17.7 pounds |
Which one should you choose?
Choose Greenworks 40V 12-Inch Trimmer and Blower Combo if
- You already own or plan to buy other 40V Greenworks tools for a unified power hub.
- You prefer an auto-feed line system that requires less manual intervention during trimming.
- You want a lighter unit that is easier to handle for extended periods around flower beds.
Choose WORX WG931 20V 3-in-1 Kit if
- You need a hedge trimmer attachment for maintaining shrubs and bushes.
- You are new to cordless outdoor tools and want a versatile 3-in-1 kit.
- You prefer a command feed button that allows you to extend line on demand.
Verdict: The Greenworks 40V model suits users already invested in the 40V ecosystem who want a lighter trimmer with auto-feed convenience. The WORX 20V kit is better for those needing a hedge trimmer attachment and a push-button line feed system. Your choice depends on whether you prioritize voltage power or additional tool variety.
40V vs 20V String Trimmers
Voltage and Power
The Greenworks 40V 12-Inch Trimmer and Blower Combo operates on a 40V system, while the WORX WG931 20V 3-in-1 Kit uses 20V. Higher voltage generally translates to more sustained power for tougher tasks. The 40V platform is designed to handle thicker brush and denser weeds with greater torque. The 20V system is lighter and often sufficient for standard lawn maintenance and light edging. Both are battery-powered, but the voltage difference affects how they perform under load during extended use sessions.
Cutting Width
Both trimmers feature a 12-inch cutting swath. This identical width means you will cover the same amount of ground per pass with either tool. The Greenworks model uses an auto-feed line system, which advances the trimmer line automatically as it wears down. The WORX kit uses a command feed system, requiring you to push a button to release more line. The physical cutting area is the same, so the difference lies in how you manage the trimmer line during operation.
Battery Capacity
The Greenworks combo includes a 2.0Ah battery, providing a specific runtime for the 40V system. The WORX kit specifications do not explicitly list the battery amp-hour capacity in the provided data, though it is part of the Power Share ecosystem. Generally, higher amp-hour ratings mean longer runtimes before needing a recharge. Since the Greenworks explicitly states 2.0Ah, you have a clear baseline for its endurance. For the WORX, you would need to check the specific battery included in your kit version to compare runtime accurately.
Line Feed System
Line management differs between the two brands. The Greenworks 40V trimmer utilizes an auto-feed mechanism. This system automatically pushes out new trimmer line as it is consumed, allowing for continuous cutting without interruption. The WORX 20V trimmer features a command feed system. This requires you to tap or push a button to manually advance the line. Auto-feed offers convenience for steady work, while command feed gives you control over line usage to prevent waste.
Weight and Balance
Weight impacts how fatiguing a tool is during extended use. The Greenworks 40V combo weighs 16.5 pounds. The WORX 20V kit weighs 17.7 pounds. The Greenworks unit is slightly lighter, which may reduce arm strain when trimming for long periods or reaching high areas. The WORX kit is marginally heavier, potentially offering more momentum for certain tasks, but the difference is small. Both are designed for handheld operation, so the lighter option is generally easier to maneuver for all-day projects.
Which 40V or 20V Trimmer Fits You
Users with existing 40V Greenworks tools
This Greenworks model runs on a 40V system with a 2.0Ah battery. It includes a 12-inch cutting swath and auto-feed line system. The 390 CFM blower handles wet leaves. If you already own other 40V Greenworks tools, this battery works with them. This compatibility saves you from buying new power sources for your existing ecosystem.
Those needing a hedge trimmer attachment
The WORX kit includes a 22-inch hedge trimmer alongside the trimmer and blower. It uses a 20V system with command feed line. The 360 CFM blower clears debris. The 12-inch cutting swath handles grass. If you want to trim hedges without switching tools, this 3-in-1 kit provides the necessary attachment in one bundle.
Buyers wanting a wheeled edger function
This WORX unit converts from a string trimmer to a wheeled edger. It operates on 20V power with a 12-inch cutting width. The command feed system advances line on demand. The 360 CFM blower assists in cleanup. If you frequently need to edge along sidewalks or driveways, this conversion feature eliminates the need for a separate edging tool.
Quick picks
| # | Product | Best for | Price |
|---|---|---|---|
| 1 | Greenworks 40V 12-Inch Trimmer and Blower Combo | Light-duty edge trimming and debris blowing | Check price of Greenworks 40V 12-Inch Trimmer and Blower Combo on Amazon |
| 2 | WORX WG931 20V 3-in-1 Kit | Users wanting a multi-tool bundle on one battery platform | Check price of WORX WG931 20V 3-in-1 Kit on Amazon |
The products compared
Greenworks 40V 12-Inch Trimmer and Blower Combo
Best for: Light-duty edge trimming and debris blowing
- Voltage
- 40V (what this guide is about)
- Cutting Swath
- 12 in
- Power Source
- battery
- Line Feed System
- auto-feed
- Battery Capacity
- 2.0 Ah
- Cutting Width
- 12-Inch
View on Amazon: Greenworks 40V 12-Inch Trimmer and Blower Combo Affiliate link
This Greenworks combo pairs a 40V 12-inch string trimmer with a 390 CFM blower. It uses a 2.0Ah battery that charges in 60 minutes. The trimmer features an auto-feed line system and a 12-inch cutting swath. The blower reaches 110 MPH. This kit weighs 16.5 pounds. It suits users who want to clear edges and blow debris with one tool system.
Pros
- 40V battery platform powers multiple tools
- 12-inch cutting swath for wider coverage
- 390 CFM blower airflow for debris removal
- Auto-feed line system reduces manual winding
- 60-minute battery charge time
Cons
- 2.0Ah battery capacity limits runtime
- 16.5-pound weight may feel heavy for extended use
- No remote control or smart app connectivity
Good fit if
- You need to trim edges and blow walkways
- You already own other 40V Greenworks tools
- You prefer auto-feed trimmer line systems
Skip if
- You require a 60V system for thick brush
- You want a larger 16-inch cutting swath
- You need a 4.0Ah battery for longer runtime
Verdict: Greenworks 40V String Trimmer & Blower Combo offers a balanced 40V solution for light to medium yard maintenance. It fits users who value tool ecosystem compatibility and quick charging over raw power or extended runtime.
WORX WG931 20V 3-in-1 Kit
Best for: Users wanting a multi-tool bundle on one battery platform
- Voltage
- 20V (what this guide is about)
- Cutting Swath
- 12"
- Power Source
- battery
- Line Feed System
- push-button
- Battery Capacity
- 2.0Ah
- Cutting Width
- 22-Inch
View on Amazon: WORX WG931 20V 3-in-1 Kit Affiliate link
This Worx kit combines a 20V string trimmer, a 22-inch hedge trimmer, and a 360 CFM blower into one bundle. It features a 12-inch cutting swath and command feed line system. The tools share the Power Share battery platform. This setup suits users who want multiple functions in one package without managing separate voltage systems. It is a practical option for general yard maintenance tasks.
Pros
- 20V Power Share battery compatibility
- 12-inch cutting swath with command feed
- 22-inch dual-action hedge trimmer blades
- 360 CFM turbine blower
Cons
- Lower 20V voltage compared to 40V competitors
- Heavier 17.7-pound total kit weight
- No dedicated display or smart connectivity
Good fit if
- You need a trimmer, edger, and blower in one bundle
- You already own Worx 20V or 40V batteries
- You prefer a 22-inch hedge trimmer for regular maintenance
Skip if
- You require maximum cutting power for thick brush
- You want a lighter single-purpose tool
- You need a 40V platform for longer runtime
Verdict: Worx 20V 3-in-1 Trimmer Kit offers a versatile bundle for users who value the convenience of a single battery platform across multiple tools. It is best for homeowners who want to trim, edge, and blow leaves without switching voltage systems.
Specifications side by side
| Spec | Greenworks 40V 12-Inch Trimmer and Blower Combo | WORX WG931 20V 3-in-1 Kit |
|---|---|---|
| Voltage | 40V | 20V |
| Cutting Swath | 12 in | 12" |
| Power Source | battery | battery |
| Line Feed System | auto-feed | push-button |
| Battery Capacity | 2.0 Ah | 2.0Ah |
| Cutting Width | 12-Inch | 22-Inch |
| Application | Lawn | not stated |
| Dimensions | 64.5 × 7.5 × 5 inches | 36.3 × 7.5 × 5.5 inches |
| Weight | 16.5 pounds | 17.7 pounds |
| Size | 40V 12" + 390CFM (2.0Ah) | 20V Trimmer + Hedge Trimmer + Turbine Blower |
| Color | Green/Black | Black and Orange |
| Model | STBA40B210 | WG931 |
Frequently asked questions
Does higher voltage mean more power in string trimmers?
Yes, higher voltage generally provides more sustained power for demanding tasks. The Greenworks 40V model operates on a 40V system, while the WORX kit uses 20V. This difference allows the 40V unit to handle thicker vegetation with less strain. You get better performance for tough weeds with the higher voltage platform.
Which system is better for heavy-duty trimming?
The 40V system is better for heavy-duty trimming due to its higher power output. The Greenworks 40V 12-Inch Trimmer offers a robust solution for light to medium yard maintenance. It provides more torque than the 20V alternative. If you face dense weeds, the 40V platform delivers the necessary cutting force.
Can I use one battery for both 20V and 40V tools?
No, you cannot use one battery for both voltage systems. The Greenworks 40V and WORX 20V kits use different battery platforms. You must buy batteries specific to each voltage. This means you need separate charging solutions for each tool system. Check your existing tool ecosystem before choosing a voltage.
What cutting width do these string trimmers offer?
The Greenworks 40V model features a 12-inch cutting width. The WORX 20V 3-in-1 Kit offers a 22-inch cutting width. A wider swath covers more ground per pass. You can choose based on whether you prioritize power or coverage area. Both options suit residential yard maintenance needs.
Do these kits include a blower function?
Yes, both kits include a blower function. The Greenworks 40V combo includes a 390 CFM blower. The WORX 20V kit also features a turbine blower. This allows you to clear debris after trimming. You get multiple tools in one package, which saves space and simplifies your garden cleanup routine.
How much do these string trimmers weigh?
The Greenworks 40V Trimmer and Blower Combo weighs 16.5 pounds. The WORX 20V 3-in-1 Kit weighs 17.7 pounds. Both weights are manageable for typical homeowners. The 40V unit is slightly lighter. You should consider how long you plan to hold the tool. Lighter weight reduces fatigue during extended use.