Lawn Mowing Time Calculator (How Long to Cut the Grass)
How long a lawn takes to mow, how far you walk, the area you get through per hour and the hours a season costs, from the lawn's area, the mower's width and your pace.
Results
The dashed line marks the value you entered.
What this tool does
Mowing is a distance problem: you cover the lawn in strips as wide as the cutting width, less the overlap you leave so no stripe is missed, so the walk is area ÷ effective width. At a steady 3 km/h a 46 cm push mower with 10 % overlap gets through roughly 1200–1300 m² an hour before stops; add time for turns, emptying the grass box and obstacles (the extra-time field). A bigger cutting width helps more than walking faster, and the chart shows how quickly the time falls. It is also a handy way to size a robotic mower: divide the lawn by the area per hour it can cut.
Formula
distance = area ÷ (cutting width × (1 − overlap)) · time = distance ÷ speed × (1 + extra)
Variables
| Symbol | Meaning | Unit |
|---|---|---|
ar | Area of the lawn | m² |
cw | Cutting width of the mower | cm |
sp | Your walking speed | km/h |
ov | Overlap between passes | % |
ex | Extra time for turns, emptying the box and obstacles | % |
nm | Times you mow a year | — |
T | Time to mow the lawn | min |
D | Distance you walk | km |
R | Area mown per hour | m²/h |
SH | Hours of mowing in a year | h |
Worked example
- Area of the lawn400 m²
- Cutting width of the mower46 cm
- Your walking speed3 km/h
- Overlap between passes10 %
- Extra time for turns, emptying the box and obstacles20 %
- Times you mow a year30
- Time to mow the lawn23 min
- Distance you walk0.97 km
- Area mown per hour1035 m²/h
- Hours of mowing in a year11.6 h
Limitations
- The result is an estimate based only on the values you type. Real situations often include factors this calculator does not know about.
- The formula assumes ideal conditions: no friction losses, no air resistance and no efficiency losses unless you enter them.