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Specs are compiled from manufacturer listings and verified buyer reviews and can change over time — please confirm the key details on the product page before buying.
A 21-inch deck covers most suburban lots efficiently while still fitting through standard 36-inch gates. Your first choice is power source: gas offers unlimited runtime and torque, while battery delivers push-button starts and quiet operation. Each type gets this guide’s attention, then a note up front: some picks here offer 21 inches exactly, while a few matching models come in a near-identical size that does the same job, so you are never misled.
I’m Mo Maruf — the founder and writer behind The Tools Trunk. This guide is built by comparing the manufacturers’ published specifications and the patterns across verified customer reviews, so you get each pick’s real strengths and trade-offs instead of marketing spin.
The right mower for your yard depends on lot size and your tolerance for pull cords. This list of the best 21 inch lawn mower options separates premium self-propelled battery power from budget gas value, with the specs and owner-verdicts that decide the right one for you.
Our Picks at a Glance
How To Choose The Best 21 Inch Lawn Mower
A 21-inch deck is the ideal width for most suburban yards, balancing speed with maneuverability around beds and fences. Power source determines weight, maintenance, and how you start the mower each week.
Match power to your lawn’s demands
Battery mowers start with a button and eliminate oil changes, air filters, and gas cans. A 6.0Ah pack on a 56V system can run about 50 minutes per charge, which comfortably covers a quarter-acre. Gas models still win on unlimited runtime and raw torque for thick, neglected grass, but they ask you to pull and to winterize.
Decide if you need self-propelled
Self-propelled drive systems handle slopes and reduce physical effort, with variable speed dials for a comfortable pace. Many offer a variable speed dial so you can stroll at your own pace. On a perfectly flat, small lot, a push mower saves weight and money.
Check the cutting height range
A wide height range—from 1.25 inches for spring trims to 4 inches for summer heat—protects your lawn’s health. More positions mean finer control. The number of levers also matters: single-lever adjustments move all wheels at once, while dual levers ask for a little more fiddling.
Quick Comparison
| Model | Best For | Power Source | Height Range | Weight | Amazon |
|---|---|---|---|---|---|
| EGO 21″ Self-Propelled★ Best Overall | Quiet, powerful battery cutting | 56V Battery | 1.25–4 in (7 pos) | 50.9 lbs | Amazon |
| Greenworks 60V Self-PropelledLarge-Yard Pick | Large battery yards up to 3/4 acre | 60V Battery | 1–4 in | 65 lbs | Amazon |
| Greenworks 48V Self-PropelledTraction Pick | Self-propelled traction on slopes | 48V Battery | 1 in min | 77 lbs | Amazon |
| Worx WG760 Self-Propelled | Self-propelled with tool-share batteries | 40V Battery | 1.5–4 in (7 pos) | 63.1 lbs | Amazon |
| Worx WG752 Push | Flat yards and garage storage | 40V Battery | 1.5–4 in (7 pos) | 55.6 lbs | Amazon |
| PowerSmart EasyGlide Gas | Budget gas with a steel deck | 144cc Gas | 1.5–3.9 in (6 pos) | 61.6 lbs | Amazon |
| SENIX Self-Propelled Gas | 170cc gas muscle on slopes | 170cc Gas | 1.25–3.75 in (6 pos) | 61.7 lbs | Amazon |
| BILT HARD Gas | 8-position height versatility | 144cc Gas | 1.2–3.75 in (8 pos) | — | Amazon |
| SENIX 144cc Push Gas | Light entry-level gas pushing | 144cc Gas | 1.25–3.75 in (6 pos) | 50 lbs | Amazon |
In-Depth Reviews
1. EGO 21″ Self Propelled Mower With Dual Toggle Kit (6.0Ah)
Our pick — 4.5★ from 300+ verified ratings; the strongest balance of quality and price.
Battery power that out-pulls gas, and the press of a button to start.
The EGO earns its popularity by giving you up to 6.0 ft-lbs of cutting torque (a measure of twisting force that helps blades slice through dense grass) — the spec sheet claims this beats gas-powered performance — and it runs on a quiet brushless motor (an electric motor with no brushes to wear out) that needs little upkeep. Owners who switched from gas report it cuts through thick grass with surprising muscle, all while running smoothly instead of roaring.
You get up to 50 minutes of run time on the included 56V 6.0Ah ARC Lithium battery (a high-capacity rechargeable pack), and buyers confirm the claim: “Battery lasts for two mows, my yard is not large but have to maneuver around yard things.” The self-propel system (which drives the wheels forward so you don’t have to push) engages with a dual-toggle handleset you can grip with either hand, and the height range spans 1.25 to 4 inches across 7 positions — the lowest setting matches this guide’s floor for scalp-tight cuts.
The headlights are genuinely useful for evening sessions, the deck is a full 21 inches, and the handle telescopes to fit taller operators without the backache. The fair warning: on larger lawns, the battery can barely finish one mow — a second pack is the common solution, and wet 6-inch grass can clog the deck even with the side chute open.
Instant-Start Wins
- Button push-button start replaces the pull cord entirely
- Quiet enough for early mornings without waking the block
- 70% of owner feedback centers on strong performance
Plan For Power
- Single battery barely covers one mow on bigger yards
- Tall, wet grass can clog even with side discharge open
Ideal if: you want gas-grade torque without gas — no oil, no pull cord, no fumes, and a deck that cuts below 2 inches.
Think twice if: your lot is well past a quarter-acre; budget for a second 6.0Ah battery to finish in one pass.
2. Greenworks 60V 21 in Self-Propelled Lawn Mower, (2) 4.0 Ah
The two-pack battery system that chases down three-quarters of an acre.
This Greenworks runs on a 60V brushless motor with two 4.0Ah batteries, and the maker claims up to 3/4 acre per charge — the longest reach in this lineup. Owner feedback backs the ambition: battery life is the single most-discussed strength, with one operator delighted that the “battery life as promised is about 50-60 minutes.”
Rear-wheel drive gives the self-propel real traction on slopes, and a variable-speed paddle lets you match pace to terrain on the fly. A turbo button for leaf pickup joins the 4-in-1 system — mulch, rear bag, side discharge, and that high-power leaf mode — while the one-lever height adjust glides from 1 to 4 inches.
The LED headlights push mowing past dusk, and it folds upright for tight garage storage. Two honest caveats: at 65 pounds it earns the “heavier with batteries” label from a 67-year-old owner who still praised it, and the auto-swap between batteries glitches occasionally, with the wheels locking on sharp turns for some.
Best for: the biggest battery-powered footprint here — two 4.0Ah packs that cover turf the 50-minute single-pack units can’t reach, backed by a 4-year tool and 4-year battery warranty.
Watch: the weight and a finicky auto battery-swap, the trade-offs for that extended range.
3. Greenworks 48V 21 in Self-Propelled Lawn Mower, (2) 5.0 Ah
Self-propelled rear-wheel grip that does the pushing so you don’t.
This one pairs two 24V batteries into a 48V system and adds a rear-wheel drive self-propel with variable speed — the combo that keeps it climbing slopes and pulling through rough patches without you straining. The brushless motor delivers its torque quietly, and a turbo button flips on maximum power for thicker going or leaf pickup.
The 4-in-1 system covers mulching, rear bagging, side discharge, and that turbo leaf mode, and the push-button start makes a first pull unnecessary. Owners confirm the setup is trivial — “takes 2 minutes to set up” — and the folding handle shrinks its storage footprint.
The honest math on battery: the advertised 45 minutes lands around 30 at a steady pace on a level lot, and a full charge can take over 2 hours. Buyers with a second pack report far better coverage, so treat the included dual-port charger as an invitation to add one.
Reach for it if: you’ve got a slope or a tired back — the adjustable-speed rear-drive self-propel is the standout feature owners praise most.
Look elsewhere if: your yard needs 45 minutes of hard cutting on one charge; budget for the second battery kit to make that real.
4. Worx Cordless Lawn Mower WG760, 40V Self-Propelled
A self-propelled 21-inch deck that shares batteries with 140+ tools.
The WG760 takes Worx’s Aerodeck vented design — which boosts air volume to stop clogs and clumping — and adds a self-propel drive with variable speed up to 3.7 MPH. The brushless motor 2.0 is claimed to deliver 40% more power and 10% longer runtime than the first generation, and the IntelliCut sensors automatically add cutting speed in thick grass, then pull it back to save battery.
That adaptive power is the defining trick here: buyers report a quarter-acre run uses about half the charge from two 5.0Ah PowerShare Pro batteries, with the self-propel earning special praise from seniors who find pushing easy. It folds upright for vertical storage and the single 7-position lever spans 1.5 to 4 inches.
What earns the caution flag is the same battery math. With self-propel engaged on a quarter-acre, some owners find the charge comes up short, and the included grass chute instructions are thin enough that buyers reach for YouTube. Full-size but stable at 63.1 pounds, it’s a heavier unit that carries its weight well.
Smart Power
- IntelliCut auto-tunes blade speed to grass density and saves runtime on thin spots
- A third of owners call out the clean cutting performance
- PowerShare batteries run 140+ Worx tools, trimmers, and blowers
Runtime Check
- Self-propel drains the pack faster — a second battery set is common advice
- Assembly instructions on the chute frustrate first-timers
Choose it if: you’re already in the Worx PowerShare ecosystem, or you want self-propelled pushing without buying into a brand-new battery platform.
Plan for: the fact that a half-acre run will fully drain the included pair — grab a second set for comfort.
5. Worx Cordless Lawn Mower WG752, 40V Push
The push-mower purest in the battery world — light, quiet, and upright-storing.
Skip the self-propel weight and this Worx trims 63.1 pounds down to 55.6 while keeping the same Aerodeck ventilated deck and the same brushless motor 2.0 with 40% more power than the first generation. For a flat, manageable yard, owners call it “very easy to push” and praise how it “stores upright so it doesn’t take up a lot of space in my garage.”
The 7-position single lever spans 1.5 to 4 inches, and the IntelliCut sensors still auto-tune blade speed to grass thickness. It runs on two 20V 5.0Ah PowerShare Pro batteries — the same cells that power 140+ Worx tools — and a 4.0Ah dual charger comes in the box. A 21-inch deck on a small yard “handles it on 1 bar” of battery, per one owner.
Battery life is the genuinely divided topic here: some call it better than their old Ryobi, others find it underwhelming, and the maneuverability split mirrors that — easy for some, a push for others. The instruction manual with tiny diagrams earns consistent criticism, though the unit itself arrives 95% assembled.
Strongest for: flat-lot owners who hate pull cords and value a garage that still fits the car — the upright fold is the trick owners love most.
Note the split: battery verdicts vary by turf, so match the 50-minute claim to your real lot size before committing.
6. PowerSmart EasyGlide 21-Inch Gas Lawn Mower, 144cc
The budget gas workhorse with a steel deck and a first-pull reputation.
This is the most-reviewed mower in the lineup, and the verdict is remarkably consistent: it starts right up on the first pull, cuts evenly, and shrugs off thick grass without complaint. The 144cc 4-stroke OHV engine pairs with an auto choke and primer system to make cold starts genuinely simple — “Starts on the first pull!” is the chorus across owner feedback.
The 21-inch steel deck is built to last through tough yard tasks, and the 3-in-1 system switches between mulching, bagging, and side discharge. A single-lever height adjustment moves all wheels through 6 positions from 1.5 to 3.9 inches — the tallest setting beats the SENIX’s 3.75-inch cap for summer heat protection.
At 61.6 pounds it’s a touch heavier than the competing SENIX push mower’s 50 pounds, and the small fuel tank plus a sometimes-damaged handle foam grip are the minor gripes in an otherwise glowing set of reviews. For a small-to-medium yard on a budget, this is the value king — the most-recommended mower in the whole guide.
Why It Wins Fans
- Reliable first-pull starts with auto choke and primer
- About 10-minute assembly from the start
- Steel deck holds up while the lighter plastic rivals flex
Small Trade-Offs
- Fuel tank is small, so fill-ups come more often
- At 61.6 lbs, it’s heavier than some same-size gas rivals
Pick it if: budget is the bottom line and you want the best-reviewed cheap gas mower, not the cheapest one.
skip it if: you need self-propelled — this is a pure push model for flat-ish ground.
7. SENIX 21” Self Propelled Gas Lawn Mower, 170cc
A 170cc engine with 6.5 ft-lb of torque — gas grunt for the tough stuff.
If you need torque that chews through 12-inch overgrowth without bogging, this SENIX delivers: a 170cc 4-cycle OHV engine (a four-stroke engine with overhead valves for efficient fuel use) producing 3.8 HP and 6.5 ft-lb of torque, with oil pre-filled so you’re mowing within seconds. Starting performance is the most-discussed strength, with one owner reporting a first-pull start even in 92°F heat.
The front-wheel self-propel drives the mower forward while you simply guide it — easy to lift the front and pivot around trees and flower beds. A 1.7-bushel bagger, 3-in-1 mulching, side discharge, and rear bagging cover every mode, and the vortex tunnel design keeps grass buildup off the deck. The 6-position dual-lever height runs 1.25 to 3.75 inches with 8-inch front and 11-inch rear wheels for rough ground.
Two honest concerns bubble up. The tallest 3.75-inch setting still cuts like a fairway — too short for lawns that need summer shade on the roots. And durability has real question marks: bolts loosening and falling out within weeks is a recurring complaint, so thread-locker on assembly is wise.
Built for: sizeable flat-ish yards where gas power and self-propel speed matter more than battery range.
Respect the catch: the height ceiling is low and the assembly needs thread-locker to keep hardware tight.
8. BILT HARD 21 Inch Lawn Mower, 144cc Gas
The widest height range in the guide — 8 positions from 1.2 to 3.75 inches.
Most mowers give you six cutting positions; this BILT HARD gives you eight, from a 1.2-inch scalping trim up to a 3.75-inch summer-length cut, all moved by a single lever that adjusts all four wheels at once. The 144cc 4-cycle engine produces 3.4 HP and 5.75 ft-lb of torque, and the 27.1 fl.oz fuel tank stretches runtime between fill-ups.
Assembly earns praise too, with oil included in the box.
The handle doesn’t fold, so storage demands a full garage wall, and a handful of owners mention a recoil guide clip that pops open during mowing. One dramatic failure review — a bent drive shaft that vibrated the machine apart — is a rare extreme, not the pattern, but it argues for a once-over of the hardware before the first cut.
Grab it for: the widest height flexibility in this guide at a value price, plus the generous fuel tank for long sessions.
Weigh the trade: a non-folding handle eats storage space, and you’ll want to re-tighten hardware after break-in.
9. SENIX 21-Inch Gas Push Lawn Mower, 144cc 2-in-1
The lightest gas mower here at 50 pounds, with a first-pull promise.
At 50 pounds, this SENIX is the featherweight of the gas group — a full 23% lighter than the PowerSmart’s 61.6 pounds — which makes it the easy-push choice for smaller yards and gentler operators. The 144cc 4-cycle engine “starts fine on the first pull every time” according to the review pages, and buyers call it “lightweight and cuts great.”
The 2-in-1 system swaps between mulching and side discharge; the 11-inch high-rear wheels roll over roots and uneven ground with less effort, and the oversized design eases pushing on bumpy terrain. The dual-lever 6-position height adjust runs 1.25 to 3.75 inches with no tools required, covering spring, summer, and fall cuts.
Assembly is genuinely quick — under 30 minutes with the included tool kit and a 2-year warranty behind it. The caveats: no bagging option (this is strictly 2-in-1, not 3-in-1), and the handling of the oil dipstick markings in the manual drew one complaint about overfilling risk. There’s also a lone but stark warning about nonexistent brand support after a missing-part issue, so check your box thoroughly on arrival.
Best for: the budget buyer who wants the easiest-pushing gas mower on this list and doesn’t need a grass bag.
One real caution: verify every part, especially the dipstick, arrives in the box — support response has been inconsistent for some.
Understanding the Specs
Cutting Height Range
The band between your shortest and tallest cut — measured in inches — is your lawn’s seasonal survival tool. A low setting like 1.25 inches gives a sharp spring trim, while pushing up near 4 inches shields roots during summer heat and drought. More positions (6, 7, or 8) mean finer control over exactly how much grass you leave behind.
Deck Size and Material
Deck width sets how much ground you cover per pass — at 21 inches, you’re in the efficient balance for residential yards. Steel decks bend less and last longer under heavy use, while plastic and polypropylene decks cut weight for easier pushing. Material often trades durability for lightness, so match it to your turf’s toughness.
FAQ
Is a 21-inch mower too big for my yard?
Should I buy a gas or battery 21-inch mower?
How long does a battery mower run on one charge?
What does self-propelled mean on a lawn mower?
What is the best cutting height for summer?
Is a steel or plastic deck better?
How do I store a 21-inch mower in a small garage?
What is the difference between a 2-in-1 and 3-in-1 mower?
Final Thoughts: The Verdict
For most buyers, the 21 inch lawn mower winner is the EGO 21″ Self-Propelled because it pairs gas-beating 6.0 ft-lbs of torque with a push-button start and 50 minutes of quiet runtime. If you want the longest battery reach for a bigger property, grab the Greenworks 60V and its two 4.0Ah packs. And for the budget buyer who values a steel deck and first-pull starts, the PowerSmart EasyGlide is the one to reach for.
How We Picked
We do not accept paid placement. Every pick is matched to a real buyer and a real use-case; we do not hands-on test units.
Sources & Methodology
Specifications: manufacturer listings and product documentation. Review insights: verified customer reviews, as of August 2026. Pricing: not shown on this page (it changes often); check the current price via the retailer link.
As an Amazon Associate, The Tools Trunk earns from qualifying purchases. This does not affect which products we feature.