Acres Per Hour Calculator

Calculate the effective field capacity of your equipment. Determine exactly how many acres per hour you can mow, spray, or plant based on speed and working width.

Operating Speed mph Sustained speed, not maximum speed. Please enter a valid speed

Working Width size Please enter a valid width

Width Unit

Use inches for mowers, feet for large ag implements.

Total Field Size (Optional) acres Used to calculate total job time. Please enter a valid area

Operating Efficiency %

Accounts for turns, overlap, refilling, and stopping. (Standard: 80%) Please enter a valid percentage

Calculation Results

Effective Field Capacity

— Acres / Hour

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How to use this acres per hour calculator

Enter your operating speed

Input the sustained speed you plan to drive the machine across the field in MPH. Be realistic—do not enter the tractor's top road speed, use the speed you can actually maintain while the implement is engaged.

Enter your working width

Input the physical width of your implement (the mower deck, spray boom, or tillage tool) and select whether you measured in inches or feet. Be sure to use the working width, not the overall frame width.

Adjust the efficiency factor

Machines are never 100% efficient. Set the slider to account for time lost to turning at the headlands, overlapping your rows, and stopping to refill seed or spray tanks. 80% is a safe baseline for most operations.

Add total acreage (Optional)

If you know the size of the field you are working on, enter the total acreage. The calculator will automatically output the estimated total hours required to finish the job.

Tractor & Implement Field Capacity (Assuming 80% Efficiency)

Implement Width	Travel Speed	Efficiency	Coverage Capacity
4 ft	3 MPH	80%	1.2 Acres/Hr
4 ft	5 MPH	80%	1.9 Acres/Hr
4 ft	8 MPH	80%	3.1 Acres/Hr
4 ft	10 MPH	80%	3.9 Acres/Hr
6 ft	3 MPH	80%	1.7 Acres/Hr
6 ft	5 MPH	80%	2.9 Acres/Hr
6 ft	8 MPH	80%	4.7 Acres/Hr
6 ft	10 MPH	80%	5.8 Acres/Hr
8 ft	3 MPH	80%	2.3 Acres/Hr
8 ft	5 MPH	80%	3.9 Acres/Hr
8 ft	8 MPH	80%	6.2 Acres/Hr
8 ft	10 MPH	80%	7.8 Acres/Hr
10 ft	3 MPH	80%	2.9 Acres/Hr
10 ft	5 MPH	80%	4.8 Acres/Hr
10 ft	8 MPH	80%	7.8 Acres/Hr
10 ft	10 MPH	80%	9.7 Acres/Hr
15 ft	3 MPH	80%	4.4 Acres/Hr
15 ft	5 MPH	80%	7.3 Acres/Hr
15 ft	8 MPH	80%	11.6 Acres/Hr
15 ft	10 MPH	80%	14.5 Acres/Hr
20 ft	3 MPH	80%	5.8 Acres/Hr
20 ft	5 MPH	80%	9.7 Acres/Hr
20 ft	8 MPH	80%	15.5 Acres/Hr
20 ft	10 MPH	80%	19.4 Acres/Hr

Frequently asked questions

What is the standard formula for acres per hour?

The industry standard formula is (Width in Feet × Speed in MPH × Efficiency %) ÷ 8.25. If you are measuring a mower deck in inches, the formula changes slightly to (Width in Inches × Speed in MPH × Efficiency %) ÷ 99. The constants (8.25 and 99) handle all the conversions between feet, miles, and acres.

What is a normal operating efficiency?

Efficiency depends entirely on the operation. Large-field broadcast spraying can hit 85–90% efficiency. Primary tillage and mowing is usually around 80–85%. Row crop planting, which requires frequent stops to refill hoppers, usually operates at 70–80%. If you are working in a small, irregular field with lots of turns and obstacles, your efficiency will plummet to 55–65%.

Why do landscapers divide by 100 instead of 99?

Dividing by 100 is a "shop floor" mental math trick used to quickly estimate 100% theoretical capacity in your head without a calculator. Mathematically, 43,560 square feet (an acre) divided by 5,280 (feet in a mile) is exactly 8.25. Multiply that by 12 inches, and you get exactly 99. This calculator uses the precise 99 denominator for absolute accuracy.

How do I account for overlap?

To avoid leaving uncut strips of grass or unplanted rows of soil, operators deliberately overlap their previous pass by a few inches. This effectively reduces your machine's working width. You can either subtract your overlap directly from the "Working Width" input, or simply lower your efficiency slider by 3-5% to account for it.

About this calculator

This acres per hour calculator provides landscapers, agronomists, and heavy machinery operators with a mathematically precise estimate of their Effective Field Capacity (EFC).

There are two primary metrics calculated by this tool:

Theoretical Field Capacity (TFC): This is the 100% perfect scenario. It assumes you never stop, never turn around, and never overlap. It is pure geometry.
Effective Field Capacity (EFC): This is the real-world scenario. It applies the "Efficiency" factor to account for headland turns, refilling sprayers/seeders, overlapping your lines, and dodging obstacles. EFC is what you use for billing and scheduling.

Common mistakes: The two most common estimating errors are using your tractor's top travel speed rather than its sustained ground-engagement speed, and using the implement's outer frame width rather than the actual width of soil/grass it treats in a single pass. Ensure your inputs reflect reality to get a reliable result.