Energy Converter

Energy Converter

Compare energy units used in science, nutrition, heating, and electricity, including joules, calories, BTU, watt-hours, and kilowatt-hours.

Results update as you type, and you can swap the source and target units at any time.

Quick Starts

Common Conversions

  • 1 kWh = 3600 kJ

    Kilowatt-hour to Kilojoule

  • 100 kcal = 418.4 kJ

    Kilocalorie to Kilojoule

  • 1 BTU = 1055.05585262 J

    British Thermal Unit to Joule

  • 500 Wh = 0.5 kWh

    Watt-hour to Kilowatt-hour

  • 1 MJ = 0.277777777778 kWh

    Megajoule to Kilowatt-hour

  • 1 ft·lbf = 1.355817948331 J

    Foot-pound to Joule

Units In This Converter

J

Joule

kJ

Kilojoule

MJ

Megajoule

cal

Calorie

kcal

Kilocalorie

Wh

Watt-hour

kWh

Kilowatt-hour

BTU

British Thermal Unit

ft·lbf

Foot-pound

Using This Tool

Use this converter to compare energy values across physics, nutrition, heating, and electricity, including joules, kilojoules, calories, watt-hours, kilowatt-hours, and BTU.

FAQ

How many joules are in one kilowatt-hour?

One kilowatt-hour is exactly 3,600,000 joules.

How many kilojoules are in one kilocalorie?

One kilocalorie is exactly 4.184 kilojoules.