Best 21 Inch Lawn Mowers in 2026: 12 Picks Ranked by Specs
As an Amazon Associate we earn from qualifying purchases. Links on this page are affiliate links.
Finding the best 21 Inch lawn mowers requires looking at published specifications. We compared 12 models to help you choose based on data, not hype. The BILT HARD 21-Inch 201cc Gas Push Mower leads because its 201cc engine provides high torque for flat yards. All picks are ranked strictly by their listed specs. This guide helps you decide which mower fits your yard size and terrain. You will see how deck material, drive type, and power source affect performance. Use these facts to pick the right tool for your needs.
Quick picks
The best fit for you
- You need high torque for flat yards BILT HARD 21-Inch 201cc Gas Push Mower The 201cc engine provides substantial torque for steady cutting on flat terrain.
- You require self-propelled power for slopes AMERISUN 21-Inch 170cc Self-Propelled Gas Mower Self-propelled drive and a 170cc engine help manage uneven ground with ease.
- You want cordless convenience with 20V tools woRkologie 21-Inch 2x20V Push Mower Dual 20V batteries and brushless motor offer flexibility for yards under 45 minutes.
- You need durable steel deck construction PowerSmart 21-Inch 140cc Gas Push Mower A solid steel deck and 3-in-1 options provide dependable cutting for medium yards.
Our 12 picks
BILT HARD 21-Inch 201cc Gas Push Mower
Best for: flat yards needing high cutting torque
- Size
- 21 Inch (what this guide is about)
- Power Source
- 201cc 4-stroke gas
- Cutting Width
- 21 in
- Drive Type
- push
- Deck Material
- steel
- Cutting Height
- 1.2-3.75 in, 10 positions
This BILT HARD walk-behind mower pairs a 21-inch steel deck with a 201cc four-stroke engine delivering 9.0 foot-pounds of torque. You get three-in-one capability for bagging, mulching, or side discharge, alongside a single lever controlling ten cutting heights between 1.2 and 3.75 inches. Its manual push setup and 73.8-pound weight suit you if you want high engine displacement without self-propelled drive hardware.
Pros
- 201cc 4-stroke engine producing 9.0 ft.lb of torque
- 10-position single-lever height adjustment from 1.2 to 3.75 inches
- 3-in-1 functionality for mulching, bagging, and side discharge
- Double ball-bearing wheels measuring 9.5 inches rear and 8 inches front
Cons
- Push drive requires manual propulsion
- Total weight is 73.8 pounds without self-propelled assist
Good fit if
- You want a high-displacement 201cc gas engine for tough grass.
- You need 10 distinct cutting height settings controlled by a single lever.
- You use mulching, bagging, and side discharge interchangeably.
Skip if
- You need a self-propelled drive system to handle slopes.
- You prefer a battery-powered platform over gas.
Verdict: BILT HARD 21-Inch 201cc Gas Push Mower provides substantial engine torque and 10 cutting positions on a durable 21-inch steel deck.
AMERISUN 21-Inch 170cc Self-Propelled Gas Mower
Best for: sloped yards needing self-propelled gas power
- Size
- 21 Inch (what this guide is about)
- Power Source
- 170cc 4-stroke OHV gas
- Cutting Width
- 21 in
- Drive Type
- self-propelled
- Deck Material
- steel
- Cutting Height
- 1.5-3.9 in, 6 positions
View on Amazon: AMERISUN 21-Inch 170cc Self-Propelled Gas Mower
The AMERISUN 21-Inch 170cc Self-Propelled Gas Mower delivers walk-behind cutting power with a 170cc 4-stroke OHV engine and a durable steel deck. Its self-propelled system pairs with 10-inch rear wheels to assist you on slopes and uneven ground. You get 3-in-1 disposal options including mulching, side discharge, and a 1.4-bushel collection bag. It suits homeowners who want a self-propelled gas machine with flexible 1.5- to 3.9-inch height adjustment.
Pros
- 170cc 4-stroke OHV gas engine
- Self-propelled drive with 10-inch rear wheels
- 3-in-1 mowing functions: mulching, side discharge, and rear bagging
- 6 cutting height settings from 1.5 to 3.9 inches
- Heavy-duty 21-inch steel deck with foldable handle
Cons
- Gas engine requires fuel and oil maintenance
- Grass collection capacity is limited to 1.4 bushels
Good fit if
- You need self-propelled assistance on slopes and uneven terrain.
- You want 3-in-1 discharge versatility with a steel cutting deck.
- You prefer a 170cc 4-stroke gas engine over battery power.
Skip if
- You prefer an electric cordless mower without engine maintenance.
- You need a grass catcher larger than 1.4 bushels.
Verdict: AMERISUN 21-Inch 170cc Self-Propelled Gas Mower pairs a 170cc OHV engine with self-propelled drive and a 21-inch steel deck for steady cutting on uneven yards. It provides flexible 3-in-1 clipping management and 6 height settings.
PowerSmart 21-Inch 144cc Gas Push Mower
Best for: bag-free mowing on standard flat yards
- Size
- 21 Inch (what this guide is about)
- Power Source
- Gas, 144cc 4-cycle OHV
- Cutting Width
- 21 in
- Drive Type
- Push
- Deck Material
- Steel
- Cutting Height
- 1.5-3.9 in, 6 positions
This push mower gives you a 21-inch steel deck paired with a 144cc 4-cycle OHV gas engine. It operates as a 2-in-1 unit with mulching and side discharge setups, skipping a rear collection bag entirely. A single lever controls the six cut height options between 1.5 and 3.9 inches. At 59.4 pounds with folding handles, it suits you if you want basic gas-powered cutting without bagging.
Pros
- 144cc 4-cycle OHV gas engine with auto-choke
- 21-inch steel cutting deck
- Single-lever 6-position height adjustment from 1.5 to 3.9 inches
- 10-inch rear wheels and 7-inch front wheels
- Foldable handle design reduces storage space
Cons
- No grass bagger included (mulch and side discharge only)
- Manual push drive with no self-propulsion
Good fit if
- You prefer mulching or side-discharging grass over bagging clippings.
- You want a gas push mower with single-lever deck height control.
- You need a compact, folding handle to save garage floor space.
Skip if
- You need a collection bag to collect your clippings.
- You want a self-propelled drive system for uneven slopes.
Verdict: PowerSmart 21-Inch 2-in-1 Push Gas Mower provides straightforward steel-deck gas cutting with convenient single-lever height adjustment. It delivers dependable performance if you do not plan to bag your clippings.
woRkologie 21-Inch 2x20V Push Mower
Best for: medium yards needing 20V tool compatibility
- Size
- 21 Inch (what this guide is about)
- Power Source
- cordless battery (2x 20V 8.0Ah)
- Cutting Width
- 21 in
- Voltage
- 20V (2x)
- Drive Type
- push
- Battery Capacity
- 8.0Ah (2x 20V)
This woRkologie model is a cordless walk-behind push mower with a 21-inch cutting deck. It runs on two 20V 8.0Ah batteries powering a two-speed brushless motor, delivering up to 45 minutes of runtime per charge. The deck offers 3-in-1 discharge modes and an eight-position cutting height range from 1.2 to 4 inches. It suits you if you want cordless mowing on standard 20V packs.
Pros
- Dual 20V 8.0Ah battery setup with up to 45 minutes of runtime
- Two-speed brushless motor operating at 2700 or 3200 RPM
- 3-in-1 capability with mulching plug, side discharge chute, and 15.8-gallon bag
- Eight cutting height positions ranging from 1.2 to 4 inches
- Included batteries share compatibility with 20V DeWalt tools
Cons
- Push drive requires manual effort without self-propulsion
- Maximum 45-minute runtime limits coverage on larger lawns
Good fit if
- You want a 21-inch cordless push mower powered by dual 20V batteries.
- You already use compatible 20V power tools and want interchangeable battery packs.
- You need cutting heights up to 4 inches with bagging, mulching, and side discharge.
Skip if
- You need a self-propelled drive system to reduce pushing effort on hills.
- You require more than 45 minutes of mowing time without swapping batteries.
Verdict: woRkologie 21-Inch 2x20V Cordless Push Mower pairs dual-battery flexibility with a full 21-inch deck and 3-in-1 discharge options. It provides an eight-position height adjustment and brushless power for yards manageable within 45 minutes of runtime.
PowerSmart 21-Inch 140cc Gas Push Mower
Best for: medium yards needing durable steel construction
- Size
- 21 Inch (what this guide is about)
- Power Source
- Gas
- Cutting Width
- 21 in
- Drive Type
- Push
- Deck Material
- Steel
- Cutting Height
- 1.5-3.9 in, 6 positions
This PowerSmart mower pairs a 21-inch steel cutting deck with a 140cc OHV gas engine. You get 3-in-1 cutting versatility with rear bagging, mulching, and rear discharge options. Its single-lever height adjuster offers six positions ranging from 1.5 inches to 3.9 inches. Fitted with 10-inch rear wheels, this unit suits you if you maintain medium lawns and require a durable steel deck with multiple clipping choices.
Pros
- Durable 21-inch steel cutting deck
- Single-lever adjustment with 6 height settings from 1.5 to 3.9 inches
- 3-in-1 clipping options: rear bagging, mulching, and rear discharge
- 10-inch rear wheels for traction
Cons
- Requires gas and oil maintenance rather than battery power
- Does not include a side discharge option
- Smaller 140cc engine displacement than 144cc and 170cc alternatives
Good fit if
- You want a heavy-duty 21-inch steel deck for clean, even passes.
- You prefer single-lever height adjustments across six positions.
- You need mulching, rear bagging, and rear discharge capabilities.
Skip if
- You want a cordless battery-powered electric mower.
- You need side discharge functionality for tall grass.
- You require an engine larger than 140cc.
Verdict: PowerSmart 21-Inch Steel Deck Gas Lawn Mower delivers dependable cutting with a solid steel deck and flexible 3-in-1 clipping options. It provides straightforward single-lever height adjustments across six settings.
SENIX 21-Inch Self-Propelled Gas Mower
Best for: sloped yards up to 1/3 acre
- Size
- 21 Inch (what this guide is about)
- Power Source
- Gas
- Cutting Width
- 21 in
- Drive Type
- Self-propelled
- Deck Material
- Steel
- Cutting Height
- 1.25-3.75 in, 6 positions
This self-propelled gas mower combines a 21-inch steel cutting deck with a 170cc four-stroke engine delivering 6.5 foot-pounds of torque. You get front-wheel drive with 11-inch rear wheels for sloped terrain, plus three-in-one capability with a 16-gallon collection bag. It suits you if you maintain yards up to one-third of an acre and need assisted propulsion with dual-lever height adjustments across six cutting positions.
Pros
- 170cc 4-stroke engine producing 3.8 HP and 6.5 ft-lb of torque
- Self-propelled front-wheel drive system
- 3-in-1 capability supporting mulching, side discharge, and rear bagging
- Dual-lever height adjustment offering 6 cutting heights from 1.25 to 3.75 inches
- Large 11-inch rear wheels paired with 8-inch front wheels
Cons
- Dual-lever height system requires adjusting two separate levers instead of a single point
- Weighs 61.7 pounds, adding resistance when maneuvering manually without engine power
- Front-wheel drive provides less uphill traction than rear-wheel drive systems
Good fit if
- You manage a lawn up to 1/3 acre with uneven surfaces or gentle slopes.
- You want self-propelled front-wheel drive to minimize pushing effort.
- You need mulching, side discharge, and rear bagging options with an included 16-gallon bag.
Skip if
- You prefer a single-lever height adjustment mechanism for quick changes.
- You want a battery-powered cordless model without gas engine maintenance.
- You need a lightweight push mower under 60 pounds.
Verdict: SENIX 21-Inch Self-Propelled Gas Mower delivers dependable cutting power with its 170cc engine, steel deck, and self-propelled drive. It is a solid choice if you need three-in-one bagging and mulching flexibility for yards up to one-third of an acre.
AMERISUN 21-Inch 144cc Gas Push Mower
Best for: small to medium lawns needing simple mulching
- Size
- 21 Inch (what this guide is about)
- Power Source
- Gas, 144cc 4-cycle OHV
- Cutting Width
- 21 in
- Drive Type
- Push
- Deck Material
- Steel
- Cutting Height
- 1.5-3.9 in, 6 positions
The AMERISUN 21-Inch 144cc Gas Push Mower is a walk-behind mower designed for routine lawn maintenance on small to medium-sized yards. It pairs a 144cc 4-cycle OHV engine with a durable 21-inch steel deck. You get a 2-in-1 cutting system supporting side discharge and mulching across six cutting heights from 1.5 to 3.9 inches. At 63 pounds, it provides a lightweight push design if you prefer manual maneuverability.
Pros
- 21-inch steel cutting deck
- 144cc 4-cycle OHV gas engine with pull start
- 6-position height adjustment ranging from 1.5 to 3.9 inches
- Lightweight 63-pound build with 10-inch rear wheels
Cons
- Manual push drive with no self-propulsion mechanism
- 2-in-1 system lacks a rear bagger attachment
Good fit if
- You want a manual push mower with a sturdy steel cutting deck.
- You prefer mulching clippings or using side discharge rather than bagging.
- You need a foldable handle for compact shed or garage storage.
Skip if
- You need a self-propelled drive system to reduce pushing effort.
- You want to collect clippings in a rear grass catcher.
Verdict: AMERISUN 21-Inch 144cc Gas Push Mower delivers straightforward cutting power with a steel deck and a lightweight 63-pound frame. It is a solid match for flat lawns where you want mulching or side discharge without extra drive mechanisms.
SENIX X6 21-Inch 60V Self-Propelled Mower
Best for: medium lawns needing high-voltage self-propelled cordless mowing
- Size
- 21 Inch (what this guide is about)
- Power Source
- Cordless battery, 60V
- Cutting Width
- 21 in
- Voltage
- 60V
- Drive Type
- Self-propelled
- Battery Capacity
- 8.0Ah
The SENIX X6 21-Inch 60V Self-Propelled Mower gives you cordless operation powered by a high-capacity 60V 8.0Ah battery and a brushless motor. It features a durable 21-inch steel deck with 3-in-1 capability for mulching, bagging, or side discharge. With single-lever 7-position height adjustment and self-propelled drive, it helps you manage medium-sized lawns easily without pushing the full 61-pound weight or handling gas and engine maintenance.
Pros
- Self-propelled drive system paired with a brushless motor
- High-capacity 60V 8.0Ah battery included with charger
- Durable 21-inch steel deck supporting mulching, bagging, and side discharge
- Single-point adjustment lever with 7 cutting height positions
- Integrated LED headlights and on-board digital status display
Cons
- Overall weight is relatively heavy at 61 pounds
- Comes with only one battery pack included in the kit
Good fit if
- You want a self-propelled cordless mower built around a durable steel deck.
- You need high run capacity from a single 60V 8.0Ah battery pack.
- You prefer full 3-in-1 versatility for bagging, mulching, and side discharge.
Skip if
- You want an ultra-lightweight push mower that weighs under 50 pounds.
- You prefer a multi-battery bay design for swapping packs on the fly.
Verdict: SENIX X6 21-Inch 60V Self-Propelled Mower delivers solid cordless power and a sturdy steel deck for medium yards. Its self-propelled drive and included 8.0Ah pack make it a capable alternative to walk-behind gas mowers.
AMERISUN 21-Inch Gas Push Mower
Best for: mulching and side discharging on flat lawns
- Size
- 21 Inch (what this guide is about)
- Power Source
- Gas, 144cc 4-stroke OHV
- Cutting Width
- 21 in
- Drive Type
- Push
- Deck Material
- Steel
- Cutting Height
- 1.5-3.9 in, 6 positions
This gas push mower pairs a 21-inch steel deck with a 144cc 4-stroke OHV engine. You get a 6-position single-lever height adjustment spanning 1.5 to 3.9 inches and a 63-pound build with a foldable handle. It operates as a 2-in-1 machine for mulching and side discharge, making it suitable if you want a wide cutting path for small to medium yards without the weight of self-propelled hardware.
Pros
- 21-inch steel cutting deck
- Single-lever 6-position height adjustment from 1.5 to 3.9 inches
- Lightweight 63-pound frame with foldable handle
- 144cc 4-stroke OHV engine with recoil start
Cons
- 2-in-1 system lacks a rear collection bag
- Push drive requires manual effort on hills
Good fit if
- You want a wide 21-inch steel deck under 65 pounds.
- You only mulch or use side discharge for clippings.
- You prefer single-lever cutting height adjustment.
Skip if
- You need a mower that bags clippings.
- You require self-propelled drive for steep slopes.
Verdict: AMERISUN 21-Inch 144cc Gas Push Mower delivers a wide steel deck and easy height adjustment for flat yards. Its 2-in-1 design suits anyone who mulches or side-discharges without needing a collection bag.
NBKXDEL 21-Inch 40V Brushless Push Mower
Best for: Medium flat yards needing flexible 3-in-1 mowing
- Size
- 21 Inch (what this guide is about)
- Power Source
- Cordless battery
- Cutting Width
- 21 in
- Voltage
- 40V
- Drive Type
- Push
- Battery Capacity
- 8.0Ah
The NBKXDEL 21-inch cordless mower runs on a 40V brushless motor operating at 3200 RPM. Powered by two included 8.0Ah batteries, it provides up to 45 minutes of runtime for yards up to 10,000 square feet. You get push operation, an eight-position cutting height lever ranging from 1.2 to 4 inches, and 3-in-1 bagging, mulching, and side discharge. It suits small to medium yards.
Pros
- Includes two 8.0Ah batteries and a 100W PD charger
- Brushless motor delivers 3200 RPM
- 8-position single lever height adjustment from 1.2 to 4 inches
- 3-in-1 functionality with mulching, side discharge, and 15.9-gallon bag
- Comes with two replacement blades
Cons
- Manual push drive without self-propelled assist
- Maximum 45-minute runtime per charge
- Weighs 53.6 pounds to push manually
Good fit if
- You have a lawn up to 10,000 square feet.
- You want a 3-in-1 deck with bagging, mulching, and side discharge.
- You use Dewalt 20V tools and want compatible batteries.
Skip if
- You need a self-propelled drive system for sloped terrain.
- You require more than 45 minutes of continuous mowing.
Verdict: NBKXDEL 21-Inch 40V Brushless Push Mower delivers capable 3-in-1 mowing and generous 8.0Ah battery capacity for yards under 10,000 square feet. Its push design and 45-minute runtime suit flat, medium-sized properties.
PowerSmart 21-Inch 144cc Gas Push Mower
Best for: flat lawns needing 3-in-1 gas push mowing
- Size
- 21 Inch (what this guide is about)
- Power Source
- Gas
- Cutting Width
- 21 in
- Drive Type
- Push
- Deck Material
- Steel
- Cutting Height
- 1.5-3.9 in, 6 positions
This gas push mower features a 21-inch steel deck paired with a 144cc 4-stroke OHV engine. You get 3-in-1 capability for mulching, bagging, or side discharge, along with a single-lever height adjuster that spans 1.5 to 3.9 inches across 6 positions. It weighs 62 pounds and folds for compact storage. It suits you if you want a standard gas-powered push machine for straightforward yard maintenance.
Pros
- 144cc 4-stroke OHV gas engine with auto choke
- 3-in-1 mowing options: side discharge, rear bag, and mulch
- Single-lever adjustment with 6 cut heights from 1.5 to 3.9 inches
- Foldable design saves storage space
Cons
- Push drive without self-propelled assist
- 62-pound weight must be pushed manually
- Requires gas engine maintenance and fuel
Good fit if
- You want a 3-in-1 gas push mower with a 21-inch steel deck.
- You prefer single-lever height changes between 1.5 and 3.9 inches.
- You need a folding handle to minimize storage space.
Skip if
- You need a self-propelled drive system to reduce physical effort.
- You prefer a cordless electric motor over a gas engine.
Verdict: PowerSmart 21-Inch 144cc Gas Push Mower delivers straightforward gas cutting with a 21-inch steel deck and 3-in-1 discharge setup. It gives you single-lever height adjustments and a folding handle for compact storage.
PowerSmart 21-Inch 3-in-1 Gas Push Mower
Best for: flat yards needing versatile 3-in-1 grass handling
- Size
- 21 Inch (what this guide is about)
- Power Source
- gas
- Cutting Width
- 21 in
- Drive Type
- push
- Deck Material
- steel
- Cutting Height
- 1.5-3.9 in, 6 positions
This walk-behind push lawn mower features a 21-inch steel deck and a 144cc 4-stroke gas engine. You get 3-in-1 capability for mulching, bagging, or side discharge, along with a single lever to choose between 6 cutting heights from 1.5 to 3.9 inches. Weighing 61.6 pounds with 10-inch rear wheels, it suits you if you want a standard gas-powered cutting width without self-propelled drive mechanics.
Pros
- 21-inch steel cutting deck
- 3-in-1 capability: mulching, bagging, and side discharge
- Single-lever height adjustment with 6 positions from 1.5 to 3.9 inches
- 10-inch rear and 7-inch front wheels with double ball bearings
- 144cc 4-stroke OHV engine with auto choke and primer
Cons
- Manual push drive without self-propelled assistance
- 61.6-pound total weight requires physical pushing effort
Good fit if
- You want 3-in-1 options for bagging, mulching, and side discharging.
- You prefer single-lever cutting height adjustment across 6 settings.
- You want a 21-inch steel deck with larger 10-inch rear wheels.
Skip if
- You need a self-propelled drive system for uneven terrain.
- You prefer battery power over a gas engine.
Verdict: PowerSmart EasyGlide 21-Inch 3-in-1 Push Gas Mower delivers versatile discharge options and a durable steel deck powered by a 144cc engine. It provides straightforward cutting performance if you do not need self-propelled operation.
Specifications side by side
| Spec | BILT HARD 21-Inch 201cc Gas Push Mower | AMERISUN 21-Inch 170cc Self-Propelled Gas Mower | PowerSmart 21-Inch 144cc Gas Push Mower | woRkologie 21-Inch 2x20V Push Mower | PowerSmart 21-Inch 140cc Gas Push Mower | SENIX 21-Inch Self-Propelled Gas Mower | AMERISUN 21-Inch 144cc Gas Push Mower | SENIX X6 21-Inch 60V Self-Propelled Mower | AMERISUN 21-Inch Gas Push Mower | NBKXDEL 21-Inch 40V Brushless Push Mower | PowerSmart 21-Inch 144cc Gas Push Mower | PowerSmart 21-Inch 3-in-1 Gas Push Mower |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Power Source | 201cc 4-stroke gas | 170cc 4-stroke OHV gas | Gas, 144cc 4-cycle OHV | cordless battery (2x 20V 8.0Ah) | Gas | Gas | Gas, 144cc 4-cycle OHV | Cordless battery, 60V | Gas, 144cc 4-stroke OHV | Cordless battery | Gas | gas |
| Cutting Width | 21 in | 21 in | 21 in | 21 in | 21 in | 21 in | 21 in | 21 in | 21 in | 21 in | 21 in | 21 in |
| Voltage | not specified | not specified | not specified | 20V (2x) | not specified | not specified | not specified | 60V | not specified | 40V | not specified | not specified |
| Drive Type | push | self-propelled | Push | push | Push | Self-propelled | Push | Self-propelled | Push | Push | Push | push |
| Battery Capacity | not specified | not specified | not specified | 8.0Ah (2x 20V) | not specified | not specified | not specified | 8.0Ah | not specified | 8.0Ah | not specified | not specified |
| Runtime | not specified | not specified | not specified | max 45 min | not specified | not specified | not specified | not specified | not specified | 45 min | not specified | not specified |
| Deck Material | steel | steel | Steel | not specified | Steel | Steel | Steel | Steel | Steel | not specified | Steel | steel |
| Cutting Height | 1.2-3.75 in, 10 positions | 1.5-3.9 in, 6 positions | 1.5-3.9 in, 6 positions | 1.2-4 in, 8 positions | 1.5-3.9 in, 6 positions | 1.25-3.75 in, 6 positions | 1.5-3.9 in, 6 positions | 7 positions | 1.5-3.9 in, 6 positions | 1.2-4 in, 8 positions | 1.5-3.9 in, 6 positions | 1.5-3.9 in, 6 positions |
| Mowing Function | 3-in-1 mulch, bag, side discharge | 3-in-1 | 2-in-1: mulch, side discharge | 3-in-1 (mulch, bag, side discharge) | 3-in-1 | 3-in-1 | 2-in-1 mulching and side discharge | 3-in-1: mulch, bag, side discharge | 2-in-1 | 3-in-1 | 3-in-1 | 3-in-1 |
| Motor Type | not specified | not specified | not specified | brushless | not specified | not specified | not specified | Brushless | not specified | Brushless | not specified | not specified |
| Application | Lawn | Lawn | Lawn | Lawn | Lawn | Lawn | Lawn | not specified | Lawn | Lawn | Lawn | Lawn |
| Size | 21 Inch | 21 Inch | 21 Inch | 21 Inch | 21 Inch | 21 Inch | 21 Inch | 21 Inch | 21 Inch | 21 Inch | 21 Inch | 21 Inch |
| Dimensions | 62.5 × 26.3 × 41 inches | 32.9 × 16.5 × 22.6 inches | 56 × 22 × 42 inches | 35.6 × 16 × 22.2 inches | 32.9 × 16.5 × 22.6 inches | 61 × 22.8 × 41.5 inches | 32.9 × 16.5 × 22.6 inches | 51 × 23 × 15.5 inches | 32.9 × 16.5 × 22.6 inches | 35.6 × 16 × 22.2 inches | 57 × 22 × 43 inches | 56.5 × 22 × 42.5 inches |
| Weight | 73.8 pounds | not specified | 59.4 pounds | 53.6 pounds | not specified | 61.7 pounds | not specified | 61 pounds | not specified | 53.6 pounds | 62 pounds | 61.6 pounds |
| Color | Blue | Black+Red | Red | 8.0Ah×2 | Black+R | Blue | Black | Blue | Black | 8.0Ah×2 | Red | Red |
| Model | 773e7abd-ce4a-48e9-8545-2424d5e0183b | AV8621S1 | DV8621C | D20LM02-4A220-1 | B8721S2 | LSSG-M10-III | AV8621C1 | LPSX6-H | AV8621C1 | D20LM02-4A220-1 | DB8721P | DB8721P |
Is a 21-Inch Deck Worth It?
A 21-inch deck covers more ground per pass than narrower models. This reduces the total time you spend mowing. All listed options use this width, balancing maneuverability with efficiency. You get a wide cut without the bulk of commercial zero-turn mowers. The standard size fits most residential driveways and storage sheds. It offers a practical middle ground for medium lawns.
Worth it if
- You want to reduce mowing time on medium-sized yards
- You need a deck that fits standard garage storage
- You prefer a balance between cut width and maneuverability
Skip it if
- You have very narrow side gates that block wide decks
- You only need to trim tight spaces around obstacles
- You prefer the lighter weight of smaller 14-inch models
When planning storage space, you can check exterior dimensions among the best storage sheds for lawn mowers.
How We Selected 21 Inch Models
We identified these mowers by scanning Amazon listings for the 21-inch size specification in the title or feature list. We included only one variant per product family to keep the guide focused. You can trust that every model listed actually cuts a 21-inch swath.
We ordered the picks by availability first, then by Amazon’s overall rating weighted by review count, and finally by how many of our criteria the specs meet. All data comes from published listing specifications. We do not handle or test these units. Prices and stock status update daily on the page.
Key Specs to Compare Before Buying
-
Check Drive Type for Slopes
Your yard slope determines whether you need a push or self-propelled model. Push mowers like the BILT HARD 201cc suit flat lawns where you can provide all the forward motion. Self-propelled options such as the AMERISUN 170cc handle slopes up to one-third acre with ease. Check the drive type in the attributes list. If your yard has hills, self-propelled drive reduces physical effort significantly. For flat terrain, a push model is lighter and easier to store.
-
Evaluate Battery Capacity for Runtime
Battery capacity dictates how long you can mow before recharging. The woRkologie 20V and NBKXDEL 40V models both include 8.0 Ah batteries. This capacity supports up to 45 minutes of runtime. This duration suits medium yards under 10,000 square feet. Larger properties may require spare batteries or a gas alternative. Check the battery capacity in the attributes. Higher Ah values generally mean longer continuous cutting time. Ensure the runtime matches your yard size to avoid mid-mow interruptions.
-
Select Mowing Function for Debris
Mowing function defines how clippings are handled. The PowerSmart 144cc offers side discharge, which is ideal if you do not plan to bag clippings. The SENIX X6 60V provides 3-in-1 bagging, mulching, and side discharge options. Check the mowing function in the attributes. If you prefer a clean lawn without bags, side discharge or mulching works best. If you want to collect grass for compost, ensure the model includes a bagging kit. Your disposal preference should drive this specification choice.
-
Consider Deck Material for Durability
Deck material affects longevity and resistance to damage. Most listed models, like the BILT HARD and PowerSmart 140cc, use steel decks. Steel provides superior durability against rocks and roots compared to plastic. The PowerSmart 140cc badge highlights its steel construction specifically. Check the deck material in the attributes or verdict. Steel decks maintain sharpness and structural integrity over time. If you mow over uneven ground with hidden debris, a steel deck is the safer choice for long-term use.
-
Match Voltage to Tool Ecosystem
Voltage determines power output and tool compatibility. The woRkologie 20V and SENIX X6 60V offer different power levels. The 60V SENIX model provides higher voltage for tougher cuts. The 20V woRkologie suits users with existing 20V tool batteries. Check the voltage in the attributes. If you own other cordless tools, stick to that voltage family to share batteries. Higher voltage models like the 60V or 40V NBKXDEL may offer more consistent power for dense grass.
Frequently asked questions
Which 21-inch mower is best for flat lawns?
The BILT HARD 21-Inch 201cc Gas Push Mower is the top choice for flat terrain. Its 201cc engine provides substantial torque for steady cutting. The push drive type is ideal when you do not need assistance moving forward. It features a durable 21-inch steel deck and ten cutting positions for precise height control.
Do I need a self-propelled 21-inch mower?
You need a self-propelled model if your yard has slopes or is larger than a third of an acre. The AMERISUN 170cc and SENIX 170cc models offer this drive type to handle uneven ground. They pair engine power with automatic forward motion. This reduces physical effort compared to push mowers like the PowerSmart 144cc.
How do I choose between gas and cordless 21-inch mowers?
Choose gas for unlimited runtime and high torque on tough grass. The BILT HARD 201cc and AMERISUN 170cc are strong options. Choose cordless for quieter operation and zero emissions. The SENIX 60V and NBKXDEL 40V models use brushless motors and 8.0 Ah batteries. They suit medium flat yards and offer 3-in-1 clipping management.
Which 21-inch mower has the best battery runtime?
The woRkologie 21-Inch 2x20V Cordless Push Mower supports dual-battery flexibility for extended runtime. It pairs an 8.0 Ah capacity with a brushless motor. The NBKXDEL 40V model also includes an 8.0 Ah battery for yards under 10,000 square feet. These models provide up to 45 minutes of runtime for medium-sized properties.
Can I mulch with any of these 21-inch mowers?
Most listed models support mulching. The AMERISUN 170cc Self-Propelled and PowerSmart 140cc offer 3-in-1 functions including mulching. The AMERISUN 144cc and SENIX 170cc also provide this flexibility. The woRkologie 20V and NBKXDEL 40V cordless models include 3-in-1 discharge options. Check the mowing function attribute to confirm mulching capability for your specific needs.
What is the lightest 21-inch mower on this list?
The woRkologie 21-Inch 2x20V Cordless Push Mower is the lightest at 53.6 pounds. The NBKXDEL 40V model shares this weight. For gas models, the PowerSmart 144cc 3-in-1 weighs 61.6 pounds. The BILT HARD 201cc is heavier at 73.8 pounds due to its larger engine. Lighter models are easier to maneuver and store.
Which mower is best for bag-free mowing?
The PowerSmart 21-Inch 144cc Gas Push Mower is best for bag-free mowing. It features a 2-in-1 design with side discharge. The AMERISUN 144cc also suits this need with a 2-in-1 setup. These push mowers allow clippings to scatter or exit the side. They are simple to use and maintain for flat lawns where bagging is unnecessary.