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Electrical Calculators

kW to HP Calculator

Convert kilowatts to horsepower using the standard 0.7457 kW/HP conversion.

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About this calculator

This calculator converts electrical or mechanical power from kilowatts (kW) to horsepower (HP) using the internationally accepted conversion factor of 1 HP = 0.7457 kW (mechanical horsepower). It is commonly used when comparing motor nameplates rated in kW to equipment or catalogues rated in HP.

Formula

HP = kW ÷ 0.7457
  • kWInput power — kilowatts
  • HPOutput power — mechanical horsepower

Worked Example

Given: A motor nameplate shows 7.5 kW.

Result: 7.5 ÷ 0.7457 = 10.06 HP, so the motor is commonly sold and referred to as a 10 HP motor.

How to Use

  1. Enter the power value in kilowatts.
  2. Click Calculate to get the equivalent horsepower.
  3. Use Reset to clear the field and start again.

Important Assumptions

  • Uses mechanical horsepower (0.7457 kW), the value used almost universally for motors.
  • Electrical (UK) horsepower and metric horsepower (PS, 0.7355 kW) differ slightly and are not used here.

Common Mistakes

  • Confusing metric horsepower (PS) with mechanical horsepower — they differ by about 1.4%.
  • Rounding the conversion factor to 0.75, which introduces a small but avoidable error on large motors.

Frequently Asked Questions

Is 1 HP exactly 0.7457 kW?

Yes, for mechanical horsepower, which is the value manufacturers use for electric motors worldwide.

Why does my motor show 7.5 kW but is called a 10 HP motor?

Because 7.5 kW converts to 10.06 HP, which is rounded to the nearest standard frame size of 10 HP.

Does efficiency affect this conversion?

No. This is a pure unit conversion between power units, not a calculation of motor output versus input power.

These calculators are provided for informational and estimation purposes. Results depend on the assumptions and input values used. Always verify critical engineering calculations against applicable standards, manufacturer specifications, site measurements, and qualified professional advice.