ClueLuma

Motor load factor (LF) calculator

Motor LF describes actual mechanical loading, not power factor.

Units
LF=Actual shaft HPNameplate HP\mathrm{LF} = \frac{\text{Actual shaft HP}}{\text{Nameplate HP}}

Calculator

Enter the values you know and leave one box empty. Calculate finds the empty one, the result or any input.

HP
HP
—

Worked example

Given

  • Actual shaft HP\text{Actual shaft HP} = 30 HP
  • Nameplate HP\text{Nameplate HP} = 50 HP
LF=3050=0.6\mathrm{LF} = \frac{30}{50} = 0.6

Symbols and units

SymbolMeaningUnit
LF\mathrm{LF}mechanical load fraction—
Actual shaft HP\text{Actual shaft HP}actual shaft outputHP
Nameplate HP\text{Nameplate HP}rated shaft outputHP

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Results are estimates for study and screening. Check the inputs, units and assumptions before you use them for design, billing or contract decisions.