Tractor Sizing Calculator

Engine HP needs from implement and soil inputs.

Implement width (ft)

Unit draft (lbs/ft)

Working depth (in)

Field speed (mph)

Soil condition (1-3)

Safety margin (%)

Tab to move between fields

Recommended engine HP

179

Total draft force (lbs)8,000

Drawbar HP106.7

PTO HP required124

Engine HP required149.4

Est. fuel use (gal/hr)6.6

How to Use This Calculator

Enter Implement Width (ft) and Unit Draft (lbs/ft) for the tillage tool or planter.
Set Working Depth (in) and Field Speed (mph) for the planned operation.
Select Soil Condition (1 = light sandy, 2 = medium loam, 3 = heavy clay).
Set Safety Margin (%) — 20% is standard to handle hills, wet conditions, and aging equipment.
Read Recommended Engine HP and Est. Fuel Use (gal/hr) to select the right tractor or compare rental specs.

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