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Energy Converter

Convert between joules, calories, kilocalories, and kilowatt-hours.

Quick Energy Converter

1 Joule = 0.001 Kilojoule

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All Energy Conversions

Joule to Kilojoule

Joule to Gram calorie

1 J = 0.23901 cal

Joule to Kilocalorie

1 J = 0.00023901 kcal

Joule to Watt-hour

1 J = 0.00027778 Wh

Joule to Kilowatt-hour

1 J = 2.778e-7 kWh

Joule to British Thermal Unit

1 J = 0.00094782 BTU

Kilojoule to Joule

Kilojoule to Gram calorie

1 kJ = 239.0057 cal

Kilojoule to Kilocalorie

1 kJ = 0.23901 kcal

Kilojoule to Watt-hour

1 kJ = 0.27778 Wh

Kilojoule to Kilowatt-hour

1 kJ = 0.00027778 kWh

Kilojoule to British Thermal Unit

1 kJ = 0.94782 BTU

Gram calorie to Joule

1 cal = 4.184 J

Gram calorie to Kilojoule

1 cal = 0.004184 kJ

Gram calorie to Kilocalorie

1 cal = 0.001 kcal

Gram calorie to Watt-hour

1 cal = 0.0011622 Wh

Gram calorie to Kilowatt-hour

1 cal = 1.162e-6 kWh

Gram calorie to British Thermal Unit

1 cal = 0.0039657 BTU

Kilocalorie to Joule

1 kcal = 4,184 J

Kilocalorie to Kilojoule

1 kcal = 4.184 kJ

Kilocalorie to Gram calorie

1 kcal = 1,000 cal

Kilocalorie to Watt-hour

1 kcal = 1.1622 Wh

Kilocalorie to Kilowatt-hour

1 kcal = 0.0011622 kWh

Kilocalorie to British Thermal Unit

1 kcal = 3.9657 BTU

Watt-hour to Joule

Watt-hour to Kilojoule

Watt-hour to Gram calorie

1 Wh = 860.4207 cal

Watt-hour to Kilocalorie

1 Wh = 0.86042 kcal

Watt-hour to Kilowatt-hour

1 Wh = 0.001 kWh

Watt-hour to British Thermal Unit

1 Wh = 3.4121 BTU

Kilowatt-hour to Joule

1 kWh = 3,600,000 J

Kilowatt-hour to Kilojoule

1 kWh = 3,600 kJ

Kilowatt-hour to Gram calorie

1 kWh = 860,420.6501 cal

Kilowatt-hour to Kilocalorie

1 kWh = 860.4207 kcal

Kilowatt-hour to Watt-hour

1 kWh = 1,000 Wh

Kilowatt-hour to British Thermal Unit

1 kWh = 3,412.1412 BTU

British Thermal Unit to Joule

1 BTU = 1,055.056 J

British Thermal Unit to Kilojoule

1 BTU = 1.0551 kJ

British Thermal Unit to Gram calorie

1 BTU = 252.1644 cal

British Thermal Unit to Kilocalorie

1 BTU = 0.25216 kcal

British Thermal Unit to Watt-hour

1 BTU = 0.29307 Wh

British Thermal Unit to Kilowatt-hour

1 BTU = 0.00029307 kWh

EnergyConversion Formulas & Examples

Gram calorie → Joule

1 cal = 4.184 J

Example: 10 cal = 41.84 J

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Joule → Gram calorie

1 J = 0.23901 cal

Example: 10 J = 2.3901 cal

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Kilocalorie → Gram calorie

1 kcal = 1,000 cal

Example: 10 kcal = 10,000 cal

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Kilowatt-hour → Joule

1 kWh = 3,600,000 J

Example: 10 kWh = 36,000,000 J

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Frequently Asked Questions

Q.How many joules are in 1 calorie and 1 kilocalorie?

One thermochemical gram calorie (cal) equals 4.184 joules (J), and one dietary kilocalorie (kcal or food Calorie) equals 4,184 joules (4.184 kJ).

Q.How do you convert kilowatt-hours (kWh) to joules and megajoules?

One kilowatt-hour (kWh) equals 3,600,000 joules (3.6 MJ) or 3,600 kilojoules, since 1 watt = 1 joule per second over 3,600 seconds.

Q.How many joules are in 1 BTU (British Thermal Unit)?

One International Table BTU equals approximately 1,055.056 joules (or 1.055 kJ). One kilowatt-hour equals approximately 3,412.14 BTU.

Q.What is the difference between thermochemical and International Table calories?

The thermochemical calorie (cal_th) is defined as exactly 4.184 J (standard in chemistry and nutrition), while the International Steam Table calorie (cal_IT) is 4.1868 J.

Related Unit Converters

Joule to Kilojoule Joule to Gram calorie Joule to Kilocalorie Joule to Watt-hour Joule to Kilowatt-hour Joule to British Thermal Unit All Unit Converters