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Energy Converter.

Convert Joule, Kilojoule, Calorie, Kilocalorie, Watt-hour, Kilowatt-hour, BTU, and Electronvolt.

Energy Converter
J
kJ
Value in Kilojoules = Value in Joules × 0.001 Multiply the value in joules by the conversion factor 0.001.

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Units Defined in Energy

Below is the complete registry of units supported within the conversion tool.

Joule

J, joule, joules

The base SI unit of energy, equal to work done by a force of one newton moving one meter.

Kilojoule

kJ, kilojoule, kilojoules

One thousand Joules.

Calorie (Gram)

cal, calorie

Energy required to raise the temperature of 1g of water by 1°C.

Kilocalorie (Food Cal)

kcal, Cal, Calories, kilocalories

Commonly known as the food calorie (capital C), representing 1,000 gram calories.

Watt-hour

Wh, watt-hour, watt-hours

Energy equivalent to one Watt of power sustained for one hour.

Kilowatt-hour

kWh, kilowatt-hour, kilowatt-hours

Standard utility bill unit representing 1,000 Watt-hours (3.6 MegaJoules).

BTU (British Thermal Unit)

BTU, btu, btus

Traditional unit of heat, energy required to raise the temperature of 1 pound of water by 1°F.

Electronvolt

eV, electronvolt, electronvolts

Tiny energy unit standard in particle physics, kinetic energy gained by a single electron moving through a 1V potential.

Popular Energy Conversions

In-depth guides with formulas, worked examples, and practical tips.

Kilojoule to Kilocalorie (Food Cal) (kJ to kcal) → Kilocalorie (Food Cal) to Kilojoule (kcal to kJ) →

All Energy Conversions

Every supported unit pair. Each opens the instant calculator above with the units pre-selected.

Joule to Kilojoule (J to kJ) Joule to Calorie (Gram) (J to cal) Joule to Kilocalorie (Food Cal) (J to kcal) Joule to Watt-hour (J to Wh) Joule to Kilowatt-hour (J to kWh) Joule to BTU (British Thermal Unit) (J to BTU) Joule to Electronvolt (J to eV) Kilojoule to Joule (kJ to J) Kilojoule to Calorie (Gram) (kJ to cal) Kilojoule to Watt-hour (kJ to Wh) Kilojoule to Kilowatt-hour (kJ to kWh) Kilojoule to BTU (British Thermal Unit) (kJ to BTU) Kilojoule to Electronvolt (kJ to eV) Calorie (Gram) to Joule (cal to J) Calorie (Gram) to Kilojoule (cal to kJ) Calorie (Gram) to Kilocalorie (Food Cal) (cal to kcal) Calorie (Gram) to Watt-hour (cal to Wh) Calorie (Gram) to Kilowatt-hour (cal to kWh) Calorie (Gram) to BTU (British Thermal Unit) (cal to BTU) Calorie (Gram) to Electronvolt (cal to eV) Kilocalorie (Food Cal) to Joule (kcal to J) Kilocalorie (Food Cal) to Calorie (Gram) (kcal to cal) Kilocalorie (Food Cal) to Watt-hour (kcal to Wh) Kilocalorie (Food Cal) to Kilowatt-hour (kcal to kWh) Kilocalorie (Food Cal) to BTU (British Thermal Unit) (kcal to BTU) Kilocalorie (Food Cal) to Electronvolt (kcal to eV) Watt-hour to Joule (Wh to J) Watt-hour to Kilojoule (Wh to kJ) Watt-hour to Calorie (Gram) (Wh to cal) Watt-hour to Kilocalorie (Food Cal) (Wh to kcal) Watt-hour to Kilowatt-hour (Wh to kWh) Watt-hour to BTU (British Thermal Unit) (Wh to BTU) Watt-hour to Electronvolt (Wh to eV) Kilowatt-hour to Joule (kWh to J) Kilowatt-hour to Kilojoule (kWh to kJ) Kilowatt-hour to Calorie (Gram) (kWh to cal) Kilowatt-hour to Kilocalorie (Food Cal) (kWh to kcal) Kilowatt-hour to Watt-hour (kWh to Wh) Kilowatt-hour to BTU (British Thermal Unit) (kWh to BTU) Kilowatt-hour to Electronvolt (kWh to eV) BTU (British Thermal Unit) to Joule (BTU to J) BTU (British Thermal Unit) to Kilojoule (BTU to kJ) BTU (British Thermal Unit) to Calorie (Gram) (BTU to cal) BTU (British Thermal Unit) to Kilocalorie (Food Cal) (BTU to kcal) BTU (British Thermal Unit) to Watt-hour (BTU to Wh) BTU (British Thermal Unit) to Kilowatt-hour (BTU to kWh) BTU (British Thermal Unit) to Electronvolt (BTU to eV) Electronvolt to Joule (eV to J) Electronvolt to Kilojoule (eV to kJ) Electronvolt to Calorie (Gram) (eV to cal) Electronvolt to Kilocalorie (Food Cal) (eV to kcal) Electronvolt to Watt-hour (eV to Wh) Electronvolt to Kilowatt-hour (eV to kWh) Electronvolt to BTU (British Thermal Unit) (eV to BTU)
FAQs

Frequently Asked Questions

How many Joules are in 1 Kilowatt-hour (kWh)?

There are exactly 3,600,000 Joules (or 3.6 Megajoules) in 1 kWh.

What is the difference between a calorie and a Calorie?

A lowercase calorie (cal) is a small metric unit (4.184 J). A capitalized Calorie (Cal) is a food calorie, which is actually a kilocalorie (1,000 small calories or 4,184 J).

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