Combine Harvester Capacity Calculator
Calculate how many acres a combine harvester covers per hour and per day from header width and speed.
Capacity = header width × speed ÷ 10 × efficiency. A 14-ft (4.3 m) combine at 4 km/h and 70% efficiency does ~3 acres/hour, ~30 acres in a 10-hour day. Real-world efficiency falls with heavy crops, lodging, wet patches and unloading waits.
Indicative planning figures based on published research averages. Local soil tests, varieties and weather change actual requirements — confirm with your agronomist or extension officer.
Farmers and custom-hire operators use the free Combine Harvester Capacity Calculator for an instant, accurate machinery answer — no formulas to remember, works offline in the field.
About Combine Harvester Capacity Calculator
At harvest, days matter: grain standing in the field is exposed to rain, hail, shattering and lodging, so knowing exactly how many acres a combine clears per day decides how many machines to book and when. This tool computes the work rate from header width, ground speed and a realistic field efficiency — typically 65–75% for combining once turning, unloading and chokes are counted. Use it to schedule harvest across fields, judge whether a custom combine's daily promise is realistic, and decide if one machine can beat the weather window or you need two.
How to use Combine Harvester Capacity Calculator
- 1Enter your tractor/implement figures into the inputs.
- 2Read the headline result and the supporting breakdown.
- 3Apply the guidance in the note to your machinery decisions.
Why use Combine Harvester Capacity Calculator?
- ✓Uses the standard, citable agricultural-engineering formula
- ✓Clear inputs with realistic defaults
- ✓Instant result with the full working shown
- ✓Free, fully in-browser and private
Frequently asked questions
How many acres can a combine harvest in a day?+
A typical 14-ft self-propelled combine at 4 km/h and 70% efficiency covers about 3 acres/hour — 30 acres in a 10-hour day. Bigger headers, lighter crops and good logistics (fast grain carting) can push this to 40+.
What slows a combine down most?+
Waiting to unload (no trailer in sync), lodged or weedy crop forcing slow feeding, wet grain in mornings/evenings, and small fields with constant turning. Matching trailer logistics to the combine often gains more acres than driving faster.
Is this tool free and private?+
Yes — free, no sign-up, and all calculation runs in your browser, so it works offline at the farm and your data never leaves the device.
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