Energy Conversions

Convert between energy units including calories, joules, kilocalories, kilojoules, and kilowatt hours.

Calories to Joules
cal → J
Joules to Calories
J → cal
Kilocalories to Kilojoules
kcal → kJ
Kilojoules to Kilocalories
kJ → kcal
Kilowatt Hours to Kilojoules
kWh → kJ
Kilojoules to Kilowatt Hours
kJ → kWh

Popular Energy Conversions

1 calorie to joules5 calories to joules10 calories to joules100 calories to joules1 joule to calories5 joules to calories10 joules to calories100 joules to calories1 kcal to kj5 kcal to kj10 kcal to kj100 kcal to kj1 kj to kcal5 kj to kcal10 kj to kcal100 kj to kcal

About Energy Conversions

Energy conversions are essential in nutrition, physics, and engineering. Calories and kilocalories are used for food energy, joules and kilojoules in science, and kilowatt hours for electricity. Our converters handle both small-scale (thermochemical) calories and food calories (kilocalories).