Acres Per Hour Calculator
Enter your implement's working width, your travel speed, and a field efficiency percentage to estimate how many acres (or hectares) you can cover per hour.
Last updated: September 22, 2026
Frequently asked questions
What is field efficiency and why isn't it 100%?
Field efficiency accounts for time and distance lost to turning at row ends, overlap between passes, filling/emptying equipment, and other stops - real-world coverage is almost always lower than the theoretical rate at full working width and speed. Typical field efficiency for many operations falls between 65% and 90% depending on field shape and equipment.
Where does the 8.25 constant in the formula come from?
It converts a swath (width × speed) into acres per hour: there are 5,280 feet in a mile and 43,560 square feet in an acre, so 5,280 ÷ 43,560 = 0.1212, and 1 ÷ 0.1212 = 8.25. Dividing width (ft) × speed (mph) by 8.25 gives acres covered per hour at 100% efficiency.
How do I estimate my actual working width?
Use the effective width of your implement (e.g., the cutting or working width of a mower, planter, or sprayer boom), not the width of the tractor or vehicle pulling it - overlap between passes should also be subtracted from the rated width if you consistently overlap by a set amount.
Can I use this for both large field equipment and smaller yard equipment?
Yes - the formula scales to any working width and speed, from a wide agricultural implement covering many acres per hour to a push mower covering a fraction of an acre per hour, as long as the units are consistent.
Why does the calculator show both an acres-per-hour and a hectares-per-hour result?
Acres are the standard land unit in the US, while hectares are standard in most other countries - showing both avoids needing a separate conversion step regardless of which unit you're planning in.
Does this account for time spent refilling or servicing equipment?
Not directly - the field efficiency percentage is meant to capture typical in-field losses like turning and overlap. If you regularly lose significant time to refilling, breakdowns, or other stops beyond normal turning, lower your efficiency estimate to reflect your actual observed coverage rate.