How much does it cost to run an electric lawn mower?
An electric lawn mower converts electrical energy into mechanical cutting power through a rechargeable battery system, eliminating the need for gasoline or oil. The energy consumption of a cordless electric mower is primarily driven by the power demand of its cutting blade motor and the capacity of its battery, which is charged seasonally during the growing months rather than continuously throughout the year.
Electric Lawn Mower running cost calculator
- Per day
- $0.20
- Per month
- $0.51
- Per year
- $6.12
- CO₂ / year
- 14.4 kg
Based on 36 kWh per year. Adjust the price per kWh to match your latest electricity bill for an exact figure.
At 1200 watts used 1 hours a day, an electric lawn mower costs about $0.20 per day, $0.51 per month and $6.12 per year on an average rate of 17¢ per kWh — roughly 36 kWh and 14.4 kg of CO₂ over a year. Enter your own electricity rate and usage in the calculator above for a figure matched to your bill.
Unlike gas mowers, electric models operate at a consistent power draw determined by their motor specifications. A typical cordless electric lawn mower draws around 1200 watts while actively cutting. The actual energy cost comes not from running the mower itself for an hour, but from charging the battery that powers that hour of work. Modern lithium-ion batteries used in quality electric mowers are reasonably efficient at storing and releasing energy, though some power is always lost as heat during the charge and discharge cycle. Understanding this charging overhead is key to realistic cost estimation—you're not paying for a direct 1200-watt hour of use, but rather for that power plus charging losses.
Seasonal usage patterns make electric lawn mowers distinct from appliances that run year-round. Most homeowners mow during a concentrated period—typically 5 to 6 months depending on climate—which means the mower sits idle for half the year. This concentrated usage window is actually favorable for energy costs, since you're only charging during the active mowing season. However, battery maintenance matters: leaving a lithium battery fully charged or completely depleted for months can reduce its lifespan, so best practice is to store the battery at a partial charge (usually around 50%) during the off-season. Some users make the mistake of charging the battery immediately after each mowing session and then leaving it charged all winter, which degrades the battery faster and means more frequent replacement purchases.
Efficiency varies meaningfully between mower models based on motor quality, blade design, and battery technology. A high-quality motor with proper gearing delivers the same cutting performance using less energy than a budget motor working harder to maintain blade speed under load. Blade sharpness is often overlooked: a dull blade forces the motor to draw more power because it tears grass instead of cutting cleanly, requiring more energy to push through the lawn. Similarly, tall or thick grass consumes more energy than regular-height lawn; the motor has to work harder to cut dense vegetation. Real-world efficiency also depends on the lawn's terrain—mowing a flat lawn is notably less demanding than pushing an electric mower up slopes, which causes the motor to draw peak power for extended periods.
Battery capacity and mower power rating should match your lawn size to avoid inefficiency. Undersized batteries force you to charge mid-session or rush through the lawn, while oversized batteries sit mostly unused. A battery rated for 60 minutes of cutting typically handles properties up to around 0.5 acres comfortably. If you regularly need multiple charge cycles to finish mowing, you're either undersized for your lawn or not maintaining blade sharpness. The other common mistake is upgrading to the highest-wattage model available thinking it will mow faster—in practice, marginal increases in motor power add disproportionate energy cost for small speed gains. Mid-range power ratings (1000 to 1400 watts) represent the efficiency sweet spot for residential use.
Charging behavior directly impacts the total energy bill in ways owners often don't consider. Charging an electric lawn mower battery from empty to full takes time, and different chargers have different efficiency ratings. A standard charger might have 85 to 90 percent efficiency, meaning 10 to 15 percent of the electricity drawn from the wall becomes heat loss rather than usable battery storage. Fast chargers are more convenient but sometimes less efficient. Additionally, ambient temperature affects charging efficiency: charging a battery in very hot or cold conditions forces the charger to work harder and wastes more energy as heat. The takeaway is that charging overnight at moderate room temperature (around 70°F) in a garage or shed will always be more energy-efficient than charging in extreme conditions or using a high-speed charger unnecessarily.
Frequently asked questions
- Does an electric lawn mower cost more to run than a gas mower?
- Not necessarily. Gas mowers are less efficient at converting fuel energy to cutting power than electric motors are at converting electricity to cutting power, and gasoline prices are volatile. The real difference is that electric mowers have no fuel cost at all during mowing—you only pay for charging. The total cost depends on local electricity rates and your mower's battery efficiency. A well-maintained electric mower is almost always cheaper to operate than gas over a full season.
- Why does my battery seem to run down faster as it gets older?
- Lithium-ion batteries lose capacity over time as their internal chemistry degrades through repeated charge cycles. After two or three seasons of regular use, a battery may retain only 80 to 90 percent of its original capacity. This is normal and doesn't mean the mower is broken—it just means you'll charge slightly more often as the battery ages. Proper storage (partial charge, cool location) and avoiding extreme temperatures slow this degradation.
- Is there a way to reduce energy use when mowing?
- Yes. Sharpen the blade at least once per season—a sharp blade reduces motor strain significantly. Mow when the grass is dry rather than after rain, as wet grass requires more cutting force. Avoid mowing in the hottest part of the day if your battery performance seems to drop in heat. Finally, keep the deck clean of grass buildup, which increases friction and motor load. These practices reduce wasted energy and extend battery runtime.
- Should I leave my electric mower battery plugged in during winter?
- No. Leaving the battery fully charged for months accelerates chemical degradation. Instead, charge it to about 50 percent, store it in a cool, dry place (ideally 50 to 75°F), and leave it unplugged until the next mowing season. A cold garage is typically ideal. Some owners do a partial top-up every month or two during storage to keep the battery healthy, though this is optional if storage conditions are stable.
- How do I know if my mower is sized correctly for my lawn?
- If you need to charge the battery more than once per mowing session on a regular basis, your mower is undersized. If the battery always has charge remaining and you only mow a small area, the mower may be oversized (though this isn't wasteful—you're just paying for more capacity than you need). Ideal sizing means the battery depletes near the end of your mowing session most weeks, with occasional full charge remaining on weeks when grass grows slowly.
- Does charging speed affect how much energy the mower uses?
- Charging speed affects efficiency and how much energy you lose as heat during charging. A fast charger may be only 80 to 85 percent efficient, while a standard charger might reach 88 to 92 percent efficiency. The difference is real but modest—maybe 10 to 15 percent higher energy draw with fast charging. Use fast charging for convenience when you need it, but standard charging is better for your wallet and battery longevity if time allows.