Mowers
Battery Mower Runtime Calculator: How Much Lawn Per Charge
Quick answer
Multiply volts by amp hours to get watt-hours, then allow about 20 watt-hours per 1,000 square feet for a 21 inch self-propelled mower in normal grass. A 56V 7.5 Ah battery (420 Wh) cuts about 21,000 square feet, just under half an acre, per charge, while a 40V 4 Ah battery (160 Wh) covers about 8,000 square feet.
Battery mowers are sold by voltage and amp hours, but the useful number is watt-hours, the energy in the pack, because it decides how much lawn you cut per charge. Enter your lawn size, battery, deck width and grass conditions, and the calculator estimates square feet per charge, minutes of cutting and how many batteries your lawn needs. Maker runtime claims are listed below for comparison. Weighing battery against gas on total cost? Use the gas vs battery cost calculator.
Battery mower runtime calculator
Coverage per charge
Battery mowers with the runtime you need
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Greenworks 60V 21 in. Push Mower Kit
$389.99SmartCut blades add power in tall or wet grass, the steel deck is IPX4 rated, and it mulches, bags, side discharges and shreds leaves.
Best for: Budget buyers with flat, small to mid-size lawns
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EGO POWER+ LM2114 21 in. Push Mower Kit
$499.00A 21-inch push model with a 6.0Ah battery rated for up to 55 minutes and a 5-year tool warranty, the simplest way into the EGO 56V platform.
Best for: Flat, smaller lawns
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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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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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EGO POWER+ LM2135SP 21 in. Select Cut Self-Propelled Mower Kit
$749.00Select Cut ships with mulching, high-lift bagging and extended-runtime lower blades, and Touch Drive varies speed from 0.9 to 3.1 mph on a 7.5Ah battery rated for up to 60 minutes.
Best for: Mid-size lawns, especially for existing EGO 56V owners
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Toro 60V MAX 21 in. Super Recycler Personal Pace Mower (Tool Only)
$769.00Personal Pace Auto-Drive follows your walking speed with no levers, and the SmartStow frame folds upright to save up to 70% more floor space; battery sold separately.
Best for: Owners already on the Toro 60V Flex-Force platform
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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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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
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Honda HRX-BE 21 in. Battery Self-Propelled Mower
$999.00Honda pairs its twin-blade MicroCut deck and 4-in-1 Versamow with two battery bays (one 12Ah pack included, about 0.37 acre per charge) and a 5-year residential warranty backed by its dealer network.
Best for: Buyers who value dealer service and bagging quality
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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+ Z6 ZT4204L 42 in. Electric Zero Turn Mower
$3,599.00Four included 10.0Ah batteries are rated for 2 acres at up to 8 mph and recharge in about two hours, and the 42-inch deck mulches, bags or side discharges.
Best for: Up to 2 acres at the lowest EGO rider price
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How much lawn can a battery mower cut per charge?
| Battery | Energy | Sq ft, normal grass | Sq ft, tall or thick | Acres, normal |
|---|---|---|---|---|
| 40V 4 Ah | 160 Wh | 8,000 | 5,714 | 0.18 |
| 40V 6 Ah | 240 Wh | 12,000 | 8,571 | 0.28 |
| 56V 4 Ah | 224 Wh | 11,200 | 8,000 | 0.26 |
| 56V 5 Ah | 280 Wh | 14,000 | 10,000 | 0.32 |
| 56V 7.5 Ah | 420 Wh | 21,000 | 15,000 | 0.48 |
| 56V 10 Ah | 560 Wh | 28,000 | 20,000 | 0.64 |
| 60V 5 Ah | 300 Wh | 15,000 | 10,714 | 0.34 |
| 80V 4 Ah | 320 Wh | 16,000 | 11,429 | 0.37 |
What runtimes do battery mower makers claim?
Manufacturer runtime and acreage claims from the product listings, against this calculator's normal-grass estimate for the included battery.
| Mower | Included battery | Maker runtime | Maker rated area | Our estimate |
|---|---|---|---|---|
| EGO POWER+ LM2206SP 22 in. Aluminum Deck Self-Propelled Mower Kit | 56V x 10 Ah = 560 Wh | 70 min | Not listed | 0.61 acres |
| EGO POWER+ LM2135SP 21 in. Select Cut Self-Propelled Mower Kit | 56V x 7.5 Ah = 420 Wh | 60 min | Not listed | 0.48 acres |
| Greenworks 80V 25 in. Self-Propelled Mower Kit | 80V x 4 Ah = 320 Wh | Not listed | 0.75 acres | 0.31 acres |
| Greenworks 80V 21 in. Self-Propelled Mower Kit | 80V x 4 Ah = 320 Wh | Not listed | 0.5 acres | 0.37 acres |
| WORX WG760 40V 21 in. 3-in-1 Self-Propelled Mower | 40V x 5 Ah = 200 Wh | Not listed | 0.5 acres | 0.23 acres |
| EGO POWER+ LM2114 21 in. Push Mower Kit | 56V x 6 Ah = 336 Wh | 55 min | Not listed | 0.39 acres |
| Greenworks 60V 21 in. Push Mower Kit | 60V x 5 Ah = 300 Wh | Not listed | Not listed | 0.34 acres |
How is battery mower runtime calculated?
- Watt-hours = battery volts x amp hours. A 56V 5 Ah pack holds 280 Wh; a 60V 5 Ah pack holds 300 Wh.
- Energy per 1,000 sq ft = about 20 Wh for a 21 inch self-propelled deck, scaled up for wider decks and by 1.4 for tall or thick grass, plus self-propel and bagging load.
- Coverage per charge = watt-hours / energy per 1,000 sq ft x 1,000.
- Minutes = coverage / cutting rate, using about 0.43 acres per hour for a 21 inch mower at 3 mph.
Voltage alone does not tell you runtime: an 80V 2 Ah pack holds 160 Wh, the same as a 40V 4 Ah pack. Compare watt-hours across brands. Most modern mowers also run their blade faster in thick grass automatically, which is why runtime claims vary so much with conditions.
How many batteries do I need for my lawn?
Divide your lawn area by the coverage per charge and round up, then add one if you mow tall grass after rain or want a margin. Up to about a quarter acre, one 5 Ah or larger 56V or 60V battery is usually enough. Between a quarter and a half acre, plan on a 7.5 Ah or 10 Ah pack or two smaller batteries: the EGO POWER+ LM2135SP 21 in. Select Cut Self-Propelled Mower Kit ships with a 7.5 Ah battery and the Greenworks 80V 21 in. Self-Propelled Mower Kit is rated up to half an acre on its included 4 Ah pack. Past half an acre, a battery walk-behind becomes a two-battery job, and a battery rider such as the EGO POWER+ Z6 ZT4204L 42 in. Electric Zero Turn Mower or a gas mower starts to make more sense. Many mowers, including the EGO POWER+ LM2206SP 22 in. Aluminum Deck Self-Propelled Mower Kit, hold two batteries and switch automatically. See the best battery lawn mowers.
Should I stay on one battery platform?
Yes, for most homeowners. Batteries are the expensive part of a cordless yard, often a third or more of a kit price, and one platform lets the same packs run the mower, trimmer, blower and hedge trimmer. EGO's 56V system covers the widest range of big outdoor tools, Greenworks' 60V and 80V lines are strong on value, and Ryobi's 40V range is broad at lower prices. Mixing brands means buying and charging two sets of batteries. The platforms are compared in cordless outdoor tool systems and EGO vs Greenworks mowers.
Frequently asked questions
How long does a 56V 5Ah battery last on a mower?
A 56V 5 Ah battery holds 280 watt-hours. On a 21 inch self-propelled mower in normal grass that is roughly 14,000 square feet, about a third of an acre, or around 45 minutes of cutting. Tall or wet grass can cut that by a third. Push mode without self-propel stretches runtime, while high-lift bagging blades shorten it.
Can a battery mower handle a half acre?
Yes, with enough battery. A half acre is 21,780 square feet, which takes roughly 440 watt-hours in normal grass, about one 56V 7.5 Ah or 10 Ah battery, or two smaller packs. Several mowers are rated for half an acre on their included battery. In thick spring growth or tall grass, expect to need a second battery or a recharge partway through.
Do higher volt mowers run longer?
Not necessarily. Runtime depends on watt-hours, which is volts multiplied by amp hours. An 80V 2 Ah battery holds 160 watt-hours, the same energy as a 40V 4 Ah battery, so they cut similar areas. Higher voltage systems can deliver more power to the blade in thick grass, but for runtime always compare watt-hours rather than the voltage on the label.
How long does it take to charge a lawn mower battery?
Charge times vary widely by battery size and charger. Standard chargers commonly take one to several hours for a 5 to 10 Ah pack, while rapid chargers can cut that substantially. Check the charge time in the listing or manual for your exact battery and charger combination, and let a hot battery cool before charging, since most chargers pause charging until it does.
How long do battery mower batteries last before replacement?
Lithium-ion mower batteries typically last several years of normal use, with warranties commonly ranging from two to five years depending on brand. Capacity fades gradually with charge cycles and heat. Storing batteries partly charged in a cool place over winter, avoiding charging them hot and not leaving them fully drained all extend their useful life.
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.