Energy Converter

Convert joules

• Joules to Kilojoules
• Joules to Calories
• Joules to Kilocalories
• Joules to Kilowatt-hours
• Joules to BTU
• Joules to Watt-hours
• Joules to Megajoules
• Joules to Foot-pounds
• Joules to Electronvolts

Convert kilojoules

• Kilojoules to Joules
• Kilojoules to Calories
• Kilojoules to Kilocalories
• Kilojoules to Kilowatt-hours
• Kilojoules to BTU
• Kilojoules to Watt-hours
• Kilojoules to Megajoules
• Kilojoules to Foot-pounds
• Kilojoules to Electronvolts

Convert calories

• Calories to Joules
• Calories to Kilojoules
• Calories to Kilocalories
• Calories to Kilowatt-hours
• Calories to BTU
• Calories to Watt-hours
• Calories to Megajoules
• Calories to Foot-pounds

Convert kilocalories

• Kilocalories to Joules
• Kilocalories to Kilojoules
• Kilocalories to Calories
• Kilocalories to Kilowatt-hours
• Kilocalories to BTU
• Kilocalories to Watt-hours
• Kilocalories to Megajoules
• Kilocalories to Foot-pounds

Convert kilowatt-hours

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

Convert BTU

• BTU to Joules
• BTU to Kilojoules
• BTU to Calories
• BTU to Kilocalories
• BTU to Kilowatt-hours
• BTU to Watt-hours
• BTU to Megajoules
• BTU to Foot-pounds

Convert watt-hours

• Watt-hours to Joules
• Watt-hours to Kilojoules
• Watt-hours to Calories
• Watt-hours to Kilocalories
• Watt-hours to Kilowatt-hours
• Watt-hours to BTU
• Watt-hours to Megajoules
• Watt-hours to Foot-pounds

Convert megajoules

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

Convert foot-pounds

• Foot-pounds to Joules
• Foot-pounds to Kilojoules
• Foot-pounds to Calories
• Foot-pounds to Kilocalories
• Foot-pounds to BTU
• Foot-pounds to Watt-hours

Convert electronvolts

• Electronvolts to Joules
• Electronvolts to Kilojoules

Energy units

Joule (J)

The joule is the SI unit of energy, equal to the work done by a force of one newton over one meter, or one watt for one second.

Kilojoule (kJ)

A kilojoule is 1000 joules. It is the unit for food energy on nutrition labels in Australia, New Zealand and, alongside kilocalories, the European Union.

Calorie (cal)

The thermochemical calorie is defined as exactly 4.184 joules, roughly the energy needed to heat one gram of water by one degree Celsius.

Kilocalorie (kcal)

A kilocalorie is 1000 calories, exactly 4184 joules using the thermochemical calorie. It is the unit of food energy on nutrition labels.

Kilowatt-hour (kWh)

A kilowatt-hour is the energy used by a 1 kilowatt load running for one hour, exactly 3,600,000 joules. It is the unit on electricity bills.

BTU

The British thermal unit is roughly the heat needed to raise one pound of water by one degree Fahrenheit. The International Table BTU is exactly 1055.05585262 joules, and it is used for heating and cooling in the United States.

Watt-hour (Wh)

A watt-hour is the energy used by a 1 watt load running for one hour, exactly 3600 joules. It is used for battery capacities.

Megajoule (MJ)

A megajoule is 1,000,000 joules. It is used for the energy content of fuels and for gas billing in some countries.

Foot-pound (ft·lbf)

A foot-pound (foot-pound force) is the work done by a force of one pound-force over a distance of one foot, exactly 1.3558179483314004 joules. It is used in the United States for muzzle energy and mechanical work.

Electronvolt (eV)

An electronvolt is the energy gained by an electron moving through a potential difference of one volt, exactly 1.602176634 × 10⁻¹⁹ joules. It is used in atomic, nuclear and particle physics.

Megawatt-hour (MWh)

A megawatt-hour is 1000 kilowatt-hours, exactly 3,600,000,000 joules. It is used for wholesale electricity and power plant output.

Therm (thm)

The US therm is defined as exactly 105,480,400 joules, about 100,000 BTU. It is used for natural gas billing in the United States.

International Table calorie (cal (IT))

The International Table calorie is defined as exactly 4.1868 joules. It is used in steam tables and some engineering references.

Erg

The erg is the unit of energy in the centimeter-gram-second system, exactly 10⁻⁷ joules. It is still used in astrophysics.