Acres Per Hour Calculator
Enter your implement width, ground speed and field efficiency to estimate how many acres you'll cover in an hour.
Acres per hour equals implement width in feet times speed in mph times 5,280, times a field-efficiency factor, divided by 43,560 (the square feet in an acre). Efficiency of 80–85% accounts for turns, overlap and stops, so real output is always below the theoretical maximum.
How to Use This Calculator
Enter the effective working width of your implement in feet — this is the width it actually covers each pass, not the overall machine width. Add your typical ground speed in miles per hour, then set a field-efficiency percentage.
Field efficiency accounts for the time lost to turning at the ends, overlapping passes, refilling and short stops. A realistic figure for most field operations is 80–85%; broadcast operations can be higher and jobs with lots of turning lower.
How the Calculation Works
In one hour at a given mph you travel that many miles, and each mile is 5,280 feet. Multiplying by the implement width gives the square feet covered per hour at 100% efficiency. Dividing by 43,560 — the number of square feet in an acre — converts that to acres.
Multiplying by the efficiency factor scales the theoretical figure down to what you will actually achieve in a real field with real turns and overlap.
acres/hour = (width ft × speed mph × 5280 × efficiency) ÷ 43,560
Worked Example
Suppose you are running a 20-foot implement at 5 mph with 85% field efficiency. Theoretical coverage is 20 × 5 × 5,280 = 528,000 square feet per hour. Apply the 85% efficiency: 528,000 × 0.85 = 448,800 square feet.
Divide by 43,560 and you get 10.3 acres per hour. Over an 8-hour day that is about 82 acres.
What the Result Means
The figure tells you how much ground you realistically cover per hour, which is what you need to plan fuel, labor and how many hours a field will take. To get acres per day, multiply by your working hours; to get total time for a field, divide the field's acreage by this rate.
If the number looks low, the biggest levers are width and speed — but pushing speed too high often lowers efficiency through overlap and skips, so the two trade off.
Assumptions and Limitations
- Uses effective working width, not the machine's overall width
- Field efficiency is your estimate — small fields with frequent turns run lower
- Assumes a steady speed; time lost to refilling or breakdowns beyond your efficiency figure is not included
- Results are rounded to one decimal place
When to Use an Acres-Per-Hour Calculator
Farmers, custom operators, and equipment dealers use this to estimate how fast a tillage, planting, spraying, or mowing pass will cover a field. Enter your implement width, working speed, and a realistic field-efficiency percentage before planning a day's work, comparing two implements, or quoting a custom job. Knowing your true coverage rate helps you budget fuel, labor, and time — and set prices that reflect the acres you can actually turn in a day.
Related Calculators
Cubic Yard Calculator
Convert length, width and depth into cubic yards for concrete, gravel, dirt or mulch.
Open calculator →Dirt Calculator
Find cubic yards and tons of fill dirt for a project.
Open calculator →Sod Calculator
Find the square footage, pallets and rolls of sod for a lawn.
Open calculator →Frequently Asked Questions
What is a good field efficiency percentage?
For most tillage and planting operations, 80–85% is realistic. Spraying and broadcasting can reach 85–90%, while operations with heavy turning in small fields may drop to 70% or lower.
Why divide by 43,560?
Because there are 43,560 square feet in one acre. The formula first works out square feet covered per hour, then divides by that number to convert the answer into acres.
Does higher speed always mean more acres per hour?
Up to a point. Faster speed increases theoretical coverage, but very high speeds usually reduce field efficiency through overlap, skips and quality problems, so the real gain is smaller than the raw speed increase suggests.
How do I find my implement's effective width?
It is the width actually worked on each pass after allowing for the overlap you drive with. If a 20-foot header is run with a 1-foot overlap, its effective width is about 19 feet.
How do I convert this to acres per day?
Multiply the acres-per-hour result by the number of hours you actually work. At 10.3 acres per hour, an 8-hour day covers about 82 acres.
Looking for a different calculator?
CalculatorPlus has free tools across finance, construction, math, health and more — each one showing the formula and a worked example.