Mowers
What Size Mower for a Half Acre? Deck Size and Mower Type
Quick answer
A half acre needs a 21 to 30 inch mower: a self-propelled walk-behind or a small rider. A 21 inch self-propelled mower takes about 1 hr 9 min on an open half acre, and a 30 inch rider about 32 minutes. The 25 inch Greenworks 80V 25 in. lands in between at about 58 minutes.
A half acre (21,780 square feet) is where people start asking about riding mowers. It is right on the line. A good self-propelled walk-behind still handles it, but an hour or more behind a mower every week adds up. The honest decision depends on how much you mind walking, how much storage you have and whether your gates fit a rider.
Most half-acre lots have about 15,000 to 18,000 square feet of actual grass once you subtract the house and hardscape. Check yours with the lawn size calculator before you decide.
On this page
How long does it take to mow a half acre?
| Mower | Time per mow | Fit for this lawn |
|---|---|---|
| 21 in walk-behind | 1 hr 9 min | Recommended |
| 30 in rider | 32 min | Recommended |
| 42 in lawn tractor | 23 min | Larger than needed |
| 46 in lawn tractor | 21 min | Larger than needed |
| 48 in zero-turn | 14 min | Larger than needed |
| 54 in zero-turn | 12 min | Larger than needed |
| 60 in zero-turn | 11 min | Larger than needed |
Recommended deck: 21 to 30 inches, self-propelled walk-behind or a 30 in. rider. Times assume typical cutting speeds (3 mph walk-behind, 4.5 mph tractor, 6.5 mph zero-turn), a 15 percent overlap and 80 percent efficiency for this terrain.
Do I need a riding mower for a half acre?
No. It is a comfort purchase, not a requirement. The numbers: a 21 inch self-propelled mower needs about 1 hr 9 min per mow, and a 42 inch lawn tractor like the Husqvarna TS 120 42 in. Lawn Tractor about 23 minutes. That difference is 46 minutes a week, or about 20 hours over a 26 mow season. For some people, 20 hours is worth $2,799.00. For others, a wider walk-behind closes most of the gap for a fraction of the price.
The middle ground is a wider walk-behind. The Greenworks 80V 25 in. Self-Propelled Mower Kit is rated for three-quarters of an acre on its 4.0Ah battery, and the 30 inch Toro 60V MAX 30 in. eTimeMaster Personal Pace Mower (Tool Only) brings the time to about 49 minutes.
How many hours a season does it take to mow a half acre?
Season totals from the same speed and efficiency assumptions as the table above, for 26 and 32 mows a year.
| Mower | Time per mow | 26 mows | 32 mows | Storage footprint |
|---|---|---|---|---|
| 21 in self-propelled (smallest recommended) | 1 hr 9 min | 30 hr | 37 hr | about 2 x 3 ft, handle folded |
| 25 in self-propelled, Greenworks 80V 25 in. Self-Propelled Mower Kit | 58 min | 25.2 hr | 31.1 hr | about 2.5 x 3.5 ft |
| 30 in walk-behind, Toro 60V MAX 30 in. eTimeMaster Personal Pace Mower (Tool Only) | 49 min | 21 hr | 25.9 hr | about 3 x 4 ft |
| 30 in rider (largest recommended) | 32 min | 14 hr | 17.3 hr | about 3 x 5.5 ft |
| 42 in lawn tractor (one size larger) | 23 min | 10 hr | 12.3 hr | about 4.5 x 6 ft |
Walk-behinds at 3 mph, riders at 4.5 mph, 80 percent efficiency. Footprints are approximate planning sizes. Measure the actual machine before building or buying storage.
Gas or battery mower for a half acre?
Battery works well at a half acre if the rated coverage matches the lot. The Greenworks 80V 21 in. Self-Propelled Mower Kit and WORX WG760 40V 21 in. 3-in-1 Self-Propelled Mower are both rated for half an acre, exactly this lot, which leaves no margin for thick spring grass. A second battery or the 25 inch Greenworks, rated for 0.75 acre, is the safer plan. The EGO POWER+ LM2206SP 22 in. Aluminum Deck Self-Propelled Mower Kit lists up to 70 minutes on its 10Ah pack and has a cast aluminum deck with a lifetime warranty.
Gas makes sense if you mow tall grass after rain, want to finish without a recharge, or already own a gas can. The SENIX 22 in. Variable Speed RWD Self-Propelled Gas Mower, 201cc is a 201cc rear-drive option. Run your own numbers in the gas vs battery cost calculator and battery runtime calculator.
Will a riding mower fit through my gate?
A mower's overall width is about 6 to 12 inches wider than its deck once you count the discharge chute and wheels. A 30 inch rider needs roughly a 40 inch opening, and a 42 inch tractor with the chute down needs roughly 48 to 54 inches. Many side-yard gates are 36 to 48 inches wide, so measure before you buy. Walk-behinds pass any standard gate. The shed size for a riding mower page covers storage clearances.
Should I bag or mulch a half-acre lawn?
Mulch by default. Clippings return nutrients and save the time spent emptying bags, and on a half acre a rear bag fills several times per mow in peak growth. Bag during leaf season or when the grass is overgrown. If the lawn is overgrown, raise the deck and follow the extension rule of cutting no more than one-third of the blade height at a time.
Which mowers fit a half-acre lawn?
Wide battery and gas walk-behinds. For the full roundup, see the best mowers for a half acre.
Greenworks 80V 25 in. Self-Propelled Mower Kit
$717.27A 25-inch deck with a brushless motor and rear-wheel drive, rated to cut up to three quarters of an acre on the included 4.0Ah battery.
Best for: Open lawns approaching an acre
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Greenworks 80V 21 in. Self-Propelled Mower Kit
$479.99Rear-wheel drive with variable speed and an 80V brushless motor, rated to cut up to half an acre on the included 4.0Ah battery with a 4-year tool and battery warranty.
Best for: Half-acre lawns with some slope
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WORX WG760 40V 21 in. 3-in-1 Self-Propelled Mower
$429.99IntelliCut sensors raise blade speed in thick grass, drive runs up to 3.7 mph, and the two included 20V 5.0Ah batteries also run WORX PowerShare tools.
Best for: Lawns up to half an acre
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SENIX 21 in. 2-in-1 Gas Push Mower, 144cc
$249.99An 11-inch rear wheel makes it easier to push over bumpy ground, and SENIX rates the 144cc engine for yards up to half an acre, backed by a 2-year warranty.
Best for: Uneven lawns up to about half an acre
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Toro 60V MAX 30 in. eTimeMaster Personal Pace Mower (Tool Only)
$1,499.00A 30-inch steel deck with Dual Force twin blades cuts a far wider path than a 21-inch mower, which Toro says saves up to 40% of mowing time; battery sold separately.
Best for: Large open lawns where you still want to walk
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EGO POWER+ LM2206SP 22 in. Aluminum Deck Self-Propelled Mower Kit
$1,299.00The cast aluminum 22-inch deck carries a lifetime warranty, and EGO lists up to 11.1 ft-lb of cutting torque with a 10.0Ah battery rated for up to 70 minutes.
Best for: Larger suburban lawns where you want a deck that will not rust
Check price on AmazonHow we chose
We did not test these products in person. Picks are researched from manufacturer specifications and owner manuals, engine and safety certifications where they apply, warranty terms, public recall records, and the recurring themes in verified owner reviews. We favor established brands with large review counts and parts support, match each pick to a real yard size or task, and place it in the tier where its price and capability actually belong.
Frequently asked questions
What size mower deck is best for a half acre?
A 21 to 30 inch deck. A 21 or 22 inch self-propelled walk-behind takes a little over an hour on an open half acre. A 25 inch walk-behind takes about 58 minutes, and a 30 inch rider about 32 minutes. Anything wider than 30 inches is optional, since a 42 inch tractor saves only about 9 more minutes over a 30 inch rider.
How long does it take to mow a half acre with a push mower?
About 1 hr 9 min with a 21 inch self-propelled mower at 3 mph. A true push mower at around 2.5 mph takes longer, roughly 1 hr 23 min. That walking time is the main reason to consider a 25 or 30 inch walk-behind, or a small rider, on a half acre.
Can a battery mower cut a half acre on one charge?
Several are rated for it. The Greenworks 80V 21 inch and WORX WG760 are rated for half an acre, and the Greenworks 80V 25 inch for three-quarters of an acre. Ratings assume normal grass, so thick, wet or tall growth shortens runtime. For a full half acre, choose a kit rated above your lot size or plan on a second battery.
Is a 30 inch riding mower worth it for a half acre?
It can be. A 30 inch rider cuts an open half acre in about 32 minutes instead of 1 hr 9 min with a walk-behind, saving roughly 16 hours a season, and it fits through narrower gates and smaller sheds than a 42 inch tractor. Budget for the storage space and the extra maintenance of a riding machine before deciding it is worth the cost.
Researched, not professional advice. This page is compiled from published specifications, manuals, labels and owner-review consensus, not hands-on testing. Follow the manufacturer's instructions and product label, and consult a qualified professional where safety, chemicals, fuel or structures are involved. As an Amazon Associate we earn from qualifying purchases.