10 Best Gas 21 Inch Lawn Mower of 2025

Tested and Reviewed: Top 10 Gas 21 Inch Lawn Mower deals with expert ratings from 8.1 to a perfect 10

July 2025 Edition

Editor's Choice

9.7

PowerSmart

PowerSmart 21" B&S Engine 140cc Self-Propelled Lawn Mower – Durable Steel Deck, 6-Height Adjustments, 3-in-1 Mulching Versatility

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Editor's bottom line:

“This gas 21 inch lawn mower is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

POWERFUL 140CC B&S ENGINEEquipped with the trusted B&S EX550 engine, this lawn mower delivers unmatched power and precision. With its easy-pull recoil and auto choke system, starting is effortless and stress-free.
3-IN-1 VERSATILITYSwitch effortlessly between mulching, rear bagging, and side discharge. This mower is designed to meet all your yard care needs with minimal effort, ensuring a neat and polished finish.
ROBUST STEEL DECKCrafted from heavy-duty alloy steel, the 21-inch cutting deck ensures long-lasting durability and efficient mowing. It covers large areas quickly, making lawn care less time-consuming and more effective.
CONVENIENT INSTANT STARTNo more heavy lifting or hard-to-pull cords! The push-button start ensures fast, hassle-free operation every time, letting you focus on perfecting your lawn.
ADJUSTABLE CUTTING HEIGHTSFeaturing 6 height settings, this mower adapts to your lawn's needs. Whether you prefer a clean, low trim or a lush, higher cut, it's easy to customize for every season.

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Picked by 154 people today

9.5

PowerSmart

PowerSmart Self Propelled Gas Lawn Mower, 21-Inch 170cc OHV Engine RWD Single-Speed 3-in-1 with Bagging

Main Highlights

Self-Propelled RWD System: A rear-wheel-drive system provides great traction on inclined slopes and is suitable for uneven terrain. With single speed 3.9-4.2 km/h.
170cc OHV 4-Cycle Engine: Equipped with a recoil starter and auto choke, this gas engine is designed to deliver more power for improved cutting efficiency and easy start.
21-Inch Steel Deck: Rugged all-steel deck is built to last, and 21 in. superior mulching blade helps you finish mowing faster.
3-In-1: Mulch, side discharge or rear bag options for you choose, and the 1.4-bushel capacity grass mower bag is easy to empty, saving you time and effort.
Adjustable Mowing Height: Adjust cutting height quickly and easily with 6-position, 2-wheel height adjustment from 1.5" to 3.9".
Easy to Mow: Foldable design saves 70% storage space, making it more convenient to unfold and use.

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9.5

BILT HARD

BILT HARD 201cc Push Lawn Mower, 3-in-1 Gas Lawnmower 21 Inch with 4-Cycle Engine, Bagging, Mulching and Side Discharge, Adjustable 10-Positions Cutting Height, Easy Start

Main Highlights

Efficient & Versatile Mowing - Our 21-inch lawn mower features 3-in-1 steel deck with mulching, side discharge and rear bagging and provides an extensive mowing path for efficiency. No choke, no primer design make it easy to start.
Reliable Performance - Featuring a robust 201cc 4-stroke OHV engine that delivers 9.0 ft.lb of torque, this gas powered lawn mower ensures efficient and reliable performance every time.
10-Positions Cutting Height - Offering a single lever four-wheel synchronized height adjustment from 1.2" to 3.75", this lawn mower lets you customize the mowing height to perfectly match your lawn requirements.
Easy Yard Maintenance - Equipped with 9.5" rear and 8" front double ball-bearing wheels for smooth and effortless movement, as well as a comfortable foam-wrapped angled grip that eliminates hand fatigue, making your lawn maintenance a breeze.
Warranty - BILT HARD is committed to providing our customers with high-quality products and exceptional customer service. We stand behind our lawn mower. If you have any questions or are not satisfied, please feel free to contact us. Our support team is ready to assist you.

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9.2

Craftsman

CRAFTSMAN Gas Powered Lawn Mower, 21-inch Push Mower with Briggs & Stratton OHV Engine, 140cc (11A-B0BY793)

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Main Highlights

2-IN-1 PUSH LAWN MOWER: Capable of mulching and side discharge of grass clippings.
POWERFUL AND DEPENDABLE ENGINE: 140cc Briggs & Stratton OHV engine is as powerful and designed to lessen noise and vibration.
ADJUSTABLE: Dual-lever, 6 position height adjustment makes it easy to change cutting heights ranging from 1.25 inches to 3.75 inches high.
11" HIGH REAR WHEELS: Easy maneuverability on any terrain
INCLUDED: Side discharge chute, mulch plug and a limited 2-year warranty.

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9.0

BILT HARD

BILT HARD 21 Inch Lawn Mower Gas Powered, 4-Cycle 201cc Engine, 3-in-1 Push Lawnmower with Bagging, Mulching & Side Discharge, Adjustable 10-Positions Cutting Height, Easy Start

Main Highlights

Powerful Engine - Featuring a robust 201cc 4-stroke OHV engine that delivers 9.0 ft.lb of torque, this gas powered lawn mower ensures efficient and reliable performance every time.
Efficient & Versatile Mowing - Our 21-inch lawn mower features 3-in-1 steel deck with mulching, side discharge and rear bagging and provides an extensive mowing path for efficiency. No choke, no primer single-pull start design, easy to operate.
Adjustable Cutting Height - Offering a single lever four-wheel synchronized height adjustment from 1.2" to 3.75", this lawn mower lets you customize the mowing height to perfectly match your lawn requirements.
Comfortable Mowing Experience - Equipped with 8" rear and 7" front double ball-bearing wheels for smooth and effortless movement, as well as a comfortable foam-wrapped angled grip that eliminates hand fatigue, making your lawn maintenance a breeze.
Warranty - BILT HARD is committed to providing our customers with high-quality products and exceptional customer service. We stand behind our lawn mower. If you have any questions or are not satisfied, please feel free to contact us via Amazon email or our official website.

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8.8

PowerSmart

PowerSmart Gas Lawn Mower 21-Inch 144 cc OHV Engine 3-in-1 Push Mower with Bagging

Main Highlights

Gas Powered Engine: A 144cc 4-cycle OHV engine equipped with recoil starter and auto choke for easy start, delivers strong power.
3-in-1 Steel Deck: All-steel deck built to last, combine mulching, bagging, and side-discharging capabilities in 1.
21" Cutting Blade: The heavy-duty blade delivers better cutting effect, allowing you to mow more in less time.
Cutting Height Adjust: Dual-lever height adjustment with 6 cutting positions allows you to choose your cut from 1.5" to 3.9".
Easy to Mow: Foldable design saves 70% storage space, making it more convenient to unfold and use.

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8.6

PowerSmart

PowerSmart Gas Lawn Mower 21-inch, 144cc OHV Engine 3-in-1 Rear Bag, Mulch and Side Discharge, 6-Position Height Adjustment

Main Highlights

Powerful Engine: A gas powered 144cc 4-cycle OHV engine equipped with recoil starter and auto choke for easy starting.
3-in-1 Steel Deck: All-steel deck built to last, combine mulching, bagging, and side-discharging capabilities in 1.
21" Cutting Blade: The heavy-duty blade delivers better cutting effect, allowing you to mow more in less time.
Cutting Height Adjust: Dual-lever height adjustment with 6 cutting positions allows you to choose your cut from 1.5" to 3.9".
Easy to Mow: Foldable design saves 70% storage space.

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8.3

PowerSmart

PowerSmart 21 in. Gas Lawn Mower, 125cc Briggs and Stratton Engine 2-in-1 Mulching Side-Discharge Push Mower with 6-Positions Height Adjustment, High Rear Wheels

Main Highlights

Engine Made in the USA: A 125cc Briggs and Stratton E300 engine equipped with recoil starter and auto choke for easy starting, delivers strong power.
2-IN-1 Steel Deck: All-steel deck built to last, combine mulch and side-discharge capabilities.
21" Blade: The 21" heavy-duty cutting blade delivers better cutting effect, allowing you to mow more in less time.
Adjustable Cutting Height: 6-positions dual-lever height adjustment allows you to choose your cut from 1.5" to 3.9".
Easy to Store: Compact design saves 70% storage space, making it more convenient to unfold and use.
High Rear Wheels: Durable 10-inch rear wheels and 7-inch front wheels are designed for easy, smooth mowing with less efforts.

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8.1

YARDMAX

YARDMAX 21 in. 170cc 2-in-1 Gas Walk Behind Push Lawn Mower with High Rear Wheels

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Main Highlights

Single-lever deck adjustment for quickly setting your mow height
MAXFlow Deck Technology volute spiral deck design for better airflow and mulching
Heavy-duty, 16-gauge stamped steel deck
Durable, one-piece seamless steel deck reduces vibration
Seven cutting heights from 1.25 to 3.75
Double-ball-bearing wheels for easy, smooth mowing with less pushing effort
Adjustable, durable 3-position handle height
Folds for space-saving storage
7 in. front and 11 in. rear wheels for stability and control
Only minimal assembly is required

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Best Value

8.1

Save 10%

SENIX

SENIX LSPG-M3 21-Inch Gas Push Lawn Mower with 125 cc 4-Cycle Briggs & Stratton Engine, Mulching and Side Discharge, 6-Position Dual Lever Height Adjustment

10% Off

Main Highlights

EFFICIENT LAWN MOWING: The SENIX 21-inch gas push mower features a steel deck with a 21-inch cutting width, providing a large cutting area with high durability for small to medium size yards; The fold-down handle allows for easy storage and space-saving
EASY-TO-START QUIET ENGINE: Briggs & Stratton 125 cc 4-cycle E450 engine with Prime n Pull start delivers the power to tackle your job; The 4-stroke engine is eco-friendly with low emissions, low fuel consumption, no mixing of oil and gas, and low noise
VERSATILE CUTTING CAPABILITY: The 2-in-1 durable steel deck allows you to mulch or side discharge; The ergonomic handle maximizes user comfort during use
HEIGHT ADJUSTMENT AND MANEUVERABILITY: The 6-position dual-lever height adjustment lets you adjust from 1.25-inches to 3.75-inches to meet the needs and conditions of your lawn; The durable 8-inch wheels are designed for easy maneuvering
WHAT'S INCLUDED: The SENIX push lawn mower comes with engine oil for your convenience; Is it backed by our 2-year limited warranty, so you can purchase with confidence

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Our Best Overall Choice

Best Choice

9.7

PowerSmart

PowerSmart 21" B&S Engine 140cc Self-Propelled Lawn Mower – Durable Steel Deck, 6-Height Adjustments, 3-in-1 Mulching Versatility

Free Shipping

Editor's bottom line:

“This is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

POWERFUL 140CC B&S ENGINEEquipped with the trusted B&S EX550 engine, this lawn mower delivers unmatched power and precision. With its easy-pull recoil and auto choke system, starting is effortless and stress-free.
3-IN-1 VERSATILITYSwitch effortlessly between mulching, rear bagging, and side discharge. This mower is designed to meet all your yard care needs with minimal effort, ensuring a neat and polished finish.
ROBUST STEEL DECKCrafted from heavy-duty alloy steel, the 21-inch cutting deck ensures long-lasting durability and efficient mowing. It covers large areas quickly, making lawn care less time-consuming and more effective.
CONVENIENT INSTANT STARTNo more heavy lifting or hard-to-pull cords! The push-button start ensures fast, hassle-free operation every time, letting you focus on perfecting your lawn.
ADJUSTABLE CUTTING HEIGHTSFeaturing 6 height settings, this mower adapts to your lawn's needs. Whether you prefer a clean, low trim or a lush, higher cut, it's easy to customize for every season.

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