Combine Capacity Calculator

Harvest rate from header, speed, and yield.

Header width (ft)

Harvest speed (mph)

Field efficiency (%)

Crop yield (bu/acre)

Grain tank capacity (bu)

Harvest hours/day

Tab to move between fields

Acres/hour

8.91

Bushels/hour1,604

Tank fill time (min)11.2

Acres/day106.9

Bushels/day19,244

Unloads/day64.1

How to Use This Calculator

Enter Header Width (ft) for your corn head or grain platform.
Set Harvest Speed (mph) — typical combines run 2.5–5 mph depending on crop and yield.
Set Field Efficiency (%) to account for turns, unloading stops, and downtime (60–75% is typical for combines).
Enter Crop Yield (bu/acre) and Grain Tank Capacity (bu) for your specific situation.
Review Acres/Hour, Bushels/Hour, Tank Fill Time (min), Acres/Day, and Unloads/Day to plan grain cart logistics.

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