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This tool calculates equivalent energy values across multiple units, including British Thermal Units (BTU), Joules (J), kilowatt-hours (kWh), therms (THM), and calories (both nutritional and thermochemical). Simply select the target unit, enter the value to convert from, and the converted result will appear instantly.
1 BTU = 1055.05585262 J
1 Joule = 0.00094781712 BTU
Introduction
Energy conversion is the transformation of energy from one form into another to make it useful for human activity. While energy comes in many forms—including kinetic, potential, gravitational, and electrical—it follows the Law of Conservation of Energy: energy can be transferred or transformed, but the total amount always remains the same.
Different industries use different units to measure energy. Below are the most common standards:
| Symbol | Unit Name | Description |
|---|---|---|
| J | Joule | The standard SI unit of energy. |
| cal | Calorie | Often used in chemistry and nutrition. |
| Wh | Watt-hour | Commonly used for electricity consumption. |
| eV | Electron volt | Used in atomic and particle physics. |
| BTU | British Thermal Unit | Standard for heating and cooling systems. |
| kgce | kg Coal Equivalent | Energy released by burning 1 kg of coal. |
| kgoe | kg Oil Equivalent | Energy released by burning 1 kg of crude oil. |
| m³ Gas | Cubic Meter Gas | Energy equivalent of natural gas volume. |
| kpm | Kilopondmeter | Obsolete gravitational metric unit. |
| erg | Erg | CGS unit equal to joules. |
Energy can be converted from one form to another. Examples: Gasoline (chemical) is put into our cars, and with the help of electrical energy from a battery, provides mechanical (kinetic) energy. Purchased electricity is fed into our TVs and is converted to light and sound.
To convert from J into units in the left column divide by the value in the right column or, multiply by the reciprocal, 1/x. To convert among any units in the left column, say from A to B, you can multiply by the factor for A to convert A into Joules then divide by the factor for B to convert out of Joules.
Divide the amount of heat energy provided to the substance, in joules, by the mass of the substance, in grams (g). For example, if 4,000 joules of energy were provided to 500 g of water, you would calculate 4,000/500 = 8. Divide the result of the previous calculation by the specific heat capacity of the substance.
1 MMBtu = 28.263682 m3 of natural gas at defined temperature and pressure.
1 au = 4.359744E-18 J. 1 x 4.359744E-18 J = 4.359744E-18 Joules.
Thus, a kiloJoule (kJ) is 1000 Joules and a megaJoule (MJ) is 1,000,000 Joules. A related unit is the Watt, which is a unit of power (energy per unit time).
Since 1 mole = 6.02214179×1023 particles (atoms, molecules, ions etc.), 1 Joule per mole is equal to 1 Joule divided by 6.02214179×1023 particles, or (6.022×10^23 particles/mole), 1.66054×10−24 Joule per particle.
A kilojoule is a unit of measure of energy, in the same way that kilometres measure distance. Food energy used to be measured in Calories (Cal) and some countries still use those units. The conversions are as follows: 1 kJ = 0.2 Cal.
1 Joule (J) is equal to 0.001 kilojoule (kJ). To convert joules to kilojoules, multiply the joule value by 0.001 or divide by 1000. For example, to convert 100 J to kJ, divide 100 by 1000, that makes 0.1 kJ is 100 J.
1 Joule (J) is the MKS unit of energy, equal to the force of one Newton acting through one meter. 1 kilowatt-hour is the energy of one kilowatt power flowing for one hour. (E = P t).
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