Convert Kilowatts to Horsepower

To convert kilowatts (kW) to horsepower (hp), multiply the kilowatt value by 1.341.

Formula:

• hp = kW × 1.341

Example:

• 10 kW × 1.341 = 13.41 hp

This conversion uses imperial (mechanical) horsepower, a common standard for engines and motors. A kilowatt is a unit of power equal to 1,000 watts, so converting kW to hp is just a unit change, not a change in actual output.

How do you convert kilowatts (kW) to horsepower (hp)?

Multiply kilowatts by a conversion factor. The factor depends on which horsepower unit you mean.

• Mechanical horsepower (hp): hp = kW × 1.341022
• Metric horsepower (PS): PS = kW × 1.3596216
• Electric horsepower (hp(E)): hp(E) = kW × 1.3404826

What’s the difference between mechanical horsepower and metric horsepower?

They’re close, but not the same unit.

• Mechanical horsepower (hp) is common in the US and uses 745.6999 watts per hp.
• Metric horsepower (PS) is common in Europe and uses 735.49875 watts per PS.

Because metric horsepower is a bit smaller, the same kW value gives a slightly higher PS number.

What is 1 kW in horsepower?

For the most used definitions:

• 1 kW = 1.3410 hp (mechanical horsepower)
• 1 kW = 1.3596 PS (metric horsepower)

What is 100 kW in horsepower?

Using standard conversions:

• 100 kW = 134.1022 hp (mechanical horsepower)
• 100 kW = 135.9622 PS (metric horsepower)

How do you convert horsepower (hp) to kilowatts (kW)?

Divide horsepower by the right factor, or multiply by the watts per horsepower.

• Mechanical horsepower: kW = hp ÷ 1.341022
• Metric horsepower: kW = PS ÷ 1.3596216

Quick rule: mechanical horsepower to kW is close to kW = hp × 0.7457.

Why do my results change depending on the horsepower type?

Horsepower is not one exact unit. Different standards define horsepower with different watt values. That small unit change creates a small change in the final number, even with the same kW input.

Which horsepower unit should I use for cars and engines?

It depends on what the spec sheet uses.

• Use mechanical horsepower (hp) for many US engine ratings.
• Use metric horsepower (PS) for many European ratings.
• Some charts also list kW only, which avoids the unit mismatch.

If you’re matching a label or document, use the same unit shown there.

Is kilowatt (kW) a measure of power or energy?

kW measures power, which is the rate of doing work. Energy uses kilowatt-hours (kWh), which is power over time.

Example: a 50 kW motor running for 2 hours uses 100 kWh of energy.

Does horsepower measure the same thing as torque?

No. Horsepower is power. Torque is turning force. They connect through engine speed (RPM).

For mechanical horsepower:

• HP = (Torque in lb-ft × RPM) ÷ 5252

High torque at low RPM can feel strong, but horsepower shows how much work the engine can do over time.

Are kW and hp values exact or rounded?

The conversion factors come from fixed unit definitions, but published results often get rounded.

Common rounding:

• to 2 decimals for quick comparisons
• to 1 decimal in spec sheets
• to whole numbers for labels or summaries

What is brake horsepower (bhp), and does it change the kW conversion?

Brake horsepower (bhp) describes how horsepower was measured, not a new power unit. It usually means engine output measured at the crankshaft, not at the wheels.

The kW to hp math stays the same. The difference comes from where and how the measurement was taken.

How do you convert kW to hp for electric motors?

Use the same conversion formulas, then keep in mind that motor ratings may be listed as:

• mechanical output power (shaft power), or
• electrical input power (what it draws from the supply)

Only compare values that refer to the same type of rating.

What’s a quick mental shortcut for kW to horsepower?

For mechanical horsepower, a simple estimate works well:

• hp ≈ kW × 1.34

For metric horsepower:

• PS ≈ kW × 1.36

These are close enough for quick checks, but use full factors for precise work.