METRICS:
1 meter = 100 centimeters1 mile = 1,609.344 meters1 pound = 453.592 grams1 hectare = 10,000 m²1 cubic foot = 28,316.8 cm³1 US gallon = 3.785 liters1 byte = 8 bits0 °C = 32 °F = 273.15 K
[ 10 / 11 ]Power

Power converter

Convert between watts, horsepower, BTU per hour and every other power unit

Please select at least 2 units to enable conversion

Power in perspective

Useful everyday values

  • A typical LED bulb: 5–15 W
  • A kettle or microwave: 1 000–3 000 W
  • A car engine: 50–300 hp
  • 1 horsepower ≈ 746 watts
  • 1 ton of refrigeration (air conditioner) ≈ 3.5 kW

Fun facts

  • James Watt coined “horsepower” to sell steam engines by comparing them to horses.
  • The human body at rest uses about 100 watts.
  • A professional cyclist can sustain around 400 watts for an hour.
  • Lightning delivers billions of watts in a fraction of a second.

Quick conversions to remember

  • 1 kW ≈ 1.34 hp
  • 1 hp ≈ 0.75 kW
  • 1 BTU/h ≈ 0.293 W