Lawn Mowing Time Estimator
Calculate the estimated time to mow your lawn based on its area, your mower's cutting width, walking speed, and overlap between passes.
Formula
1. Effective Cutting Width (ft)
effectiveWidth = (cuttingWidth_in × (1 − overlap% / 100)) / 12
2. Total Distance to Cover (ft)
totalDistance = lawnArea_sqft / effectiveWidth_ft
3. Mowing Speed (ft/min)
speed_ft_per_min = speed_mph × 88
(1 mph = 5,280 ft / 60 min = 88 ft/min)
4. Pure Mowing Time (min)
mowingTime = totalDistance / speed_ft_per_min
5. Number of Passes
passes = ⌈ √(lawnArea) / effectiveWidth ⌉
(assumes approximately square lawn)
6. Turn Time (min)
turnTime = (passes × turnTime_sec) / 60
7. Obstacle Time (min)
obstacleTime = (obstacles × timePerObstacle_sec) / 60
8. Total Time (min)
totalTime = mowingTime + turnTime + obstacleTime
Assumptions & References
- The lawn is assumed to be approximately rectangular or square for estimating the number of passes and strip length.
- 1 mph = 88 feet per minute (standard unit conversion: 5,280 ft/mile ÷ 60 min/hr).
- A typical walk-behind mower has a cutting width of 18–22 inches and is operated at 2–4 mph.
- A typical riding mower has a cutting width of 42–54 inches and operates at 4–8 mph.
- A 10% overlap is commonly recommended to avoid missed strips (University of Minnesota Extension).
- Turn time accounts for the time to reverse direction at the end of each pass; 5–10 seconds is typical for walk-behind mowers.
- Obstacle time accounts for maneuvering around trees, flower beds, and other fixed objects.
- This estimate does not include time for refueling, emptying the grass catcher, or rest breaks.
- Reference: Purdue Extension — Lawn Mowing Practices; USDA Cooperative Extension lawn care guidelines.