Use Our Robot Mower Battery Runtime Estimator
Below
Battery Runtime Estimator
Enter your yard details to see how much battery each mower actually uses — and whether it can finish your lawn on a single charge.
Your yard
Conditions
Battery demand level
* Battery estimates are based on manufacturer specs and real-world usage data. Actual performance varies by terrain, temperature, and mower condition. Links are affiliate links — we may earn a small commission at no extra cost to you.
How to use The Robot Mower Battery Runtime Estimator
One of the most misleading numbers in the robot mower market is the coverage rating. Manufacturers test battery life on flat, dry, short grass under ideal conditions. Your yard is none of those things.
This tool calculates the real effective coverage each mower delivers under your specific conditions and tells you whether it can finish the job on a single charge.
Start by selecting your yard size from the dropdown. Then choose your grass type — denser and longer grass draws significantly more power than a short, fine lawn. Use the slope slider to set your average gradient.
This is the single biggest battery drain factor: mowing uphill at 40% consumes dramatically more energy than mowing flat ground. The slider runs from 0 to 80%, covering the full range of residential slopes.
Next, set your ground conditions and obstacle density. Wet or clay soil increases rolling resistance and traction demand. Dense obstacles like trees, garden beds, and narrow passages force more turns and direction changes, each of which costs battery.
The tool then evaluates all six mowers simultaneously. Each mower card shows whether it can complete your yard on a single charge, how many charge cycles it needs if not, and the total estimated charging time.
A visual bar shows exactly how much of your yard each mower covers per charge cycle relative to your total area. Models where your slope exceeds their rated limit are flagged as incompatible so you never accidentally buy an underpowered machine.
If you’ve been searching for robot mower battery life on hills, how long does a robot mower take to mow my lawn, or robot mower coverage on slopes, this estimator gives you a model-by-model answer based on your real yard conditions.