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Power Converter

Power is the rate of energy use — measured in watts (SI), kilowatts, or horsepower. Two horsepower definitions are in use: mechanical hp (745.7 W, US/UK car spec) and metric horsepower or PS (735.5 W, EU vehicle papers). They differ by ~1.4%.

🔌 Power Converter

Convert power units quickly and accurately

0.001

1 W=0.001 kW

Watt → Kilowatt Table

Watt (W)Kilowatt (kW)
0.0010.000001
0.010.00001
0.10.0001
10.001
20.002
50.005
100.01
250.025
500.05
1000.1
10001
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Conversion Formulas

  • 1 kW = 1.34102 hp = 1.35962 PS
  • 1 hp (mechanical) = 745.7 W = 0.7457 kW
  • 1 PS (metric hp) = 735.5 W
  • 1 kW = 1,000 W
  • 1 kWh of energy = 1 kW for 1 hour

Common Values

  • 100 kW = 134.1 hp = 135.96 PS
  • 300 hp = 223.7 kW
  • 1 kW = 1.34 hp
  • 60 W bulb = 0.06 kW
  • EV charger 22 kW = 29.5 hp

Common Uses

  • Car engine specs (US hp vs EU PS)
  • EV registration and insurance
  • Industrial motor sizing
  • Solar panel arrays (peak watt rating)
  • Heating/cooling load calculations

Frequently Asked Questions

How many hp in 100 kW?

134.1 mechanical hp, or 135.96 PS.

Is hp the same as PS?

Almost. PS (metric horsepower) = 735.5 W; mechanical hp = 745.7 W. PS values are ~1.4% higher.

Why do EVs use kW?

Electric motors are rated by their continuous electrical power input — naturally measured in kW.

How many watts is 1 hp?

745.7 W (mechanical) or 735.5 W (metric).

Reviewed by the ConvertProf editorial team. All conversion factors follow internationally agreed standards (SI, ISO, NIST). Spotted an error? Email hello@convertprof.com.
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