Energy Converter

Convert between Joules, calories, kWh, and BTU.

Metric

Joules (J)

Kilojoules (kJ)

Watt-hours (Wh)

Kilowatt-hours (kWh)

Scientific

Calories (cal)

Kilocalories (kcal)

Imperial

BTU (BTU)

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About Energy Conversion

Energy conversions are used in nutrition, physics, electricity billing, and HVAC systems.

Frequently Asked Questions

How many Joules in a calorie?

1 calorie equals 4.184 Joules.

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Popular Conversions

Joules to Kilojoules Joules to Calories Joules to Kilocalories Joules to Watt-hours Joules to Kilowatt-hours Joules to BTU Kilojoules to Joules Kilojoules to Calories Kilojoules to Kilocalories Kilojoules to Watt-hours Kilojoules to Kilowatt-hours Kilojoules to BTU