Field Capacity Calculator
Fill in the values and the answer updates as you type.
How the Field Capacity Calculator works
Field capacity in acres per hour = working width in feet × speed in mph × field efficiency ÷ 8.25, where 8.25 comes from 43,560 square feet per acre ÷ 5,280 feet per mile. Field efficiency allows for turns at the headlands, overlap, filling the seed or tank, and unclogging, and is about 70 to 85% for many tillage and planting jobs. Hours = field size ÷ capacity, and fuel = fuel use per hour × hours. Use your own measured speed and efficiency for the most useful result. Example: with Implement working width 40 ft, Working speed 6 mph, Field efficiency 75 %, Field size 160 acres, and Fuel use 14 gal/h, the result is Field capacity (acres per hour) = 21.8; Hours to cover the field = 7.3; Fuel for the field (gal) = 102.7.
Inputs and results
The Field Capacity Calculator takes 5 inputs and gives 5 results.
What you enter
- Implement working width (ft) — starts at 40.
- Working speed (mph) — starts at 6.
- Field efficiency (%) — starts at 75.
- Field size (acres) — starts at 160.
- Fuel use (gal/h) — starts at 14.
What you get
- Field capacity (acres per hour)
- Hours to cover the field
- Fuel for the field (gal)
- Fuel per acre (gal)
- Working days at 10 hours a day
Example: Field Capacity Calculator with the starting values
With implement working width 40 ft, working speed 6 mph, field efficiency 75 %, field size 160 acres and fuel use 14 gal/h, the calculator returns:
| Field capacity (acres per hour) | 21.8 |
|---|---|
| Hours to cover the field | 7.3 |
| Fuel for the field (gal) | 102.7 |
| Fuel per acre (gal) | 0.64 |
| Working days at 10 hours a day | 0.7 |
Change any value above and the results update straight away.
Field Capacity Calculator FAQ
How do I use the Field Capacity Calculator?
Enter implement working width, working speed, field efficiency and field size in the fields, then read field capacity (acres per hour), hours to cover the field, fuel for the field (gal) and fuel per acre (gal) in the result panel. The answer updates as you type, and you can press Calculate or Enter to refresh it. Use “Copy link” to share your exact numbers with someone else.
What does the Field Capacity Calculator calculate?
Acres per hour, hours, and fuel for a tractor and implement. It returns field capacity (acres per hour), hours to cover the field, fuel for the field (gal) and fuel per acre (gal) from the 5 values you provide.
What values does the Field Capacity Calculator start with?
It opens with implement working width 40 ft, working speed 6 mph, field efficiency 75 % and field size 160 acres so you can see a working result straight away. Replace them with your own numbers, or press Reset to return to these starting values.
Is the Field Capacity Calculator free and private?
Yes. It is free, needs no account, and runs in your browser, so nothing you type is sent to or stored on our servers. See the Privacy Policy for details.
Can I rely on the Field Capacity Calculator for important decisions?
Treat the result as a well-rounded estimate. Real situations often have details a general calculator cannot know, so confirm important decisions with a qualified professional. See the Disclaimer for more.