| Unit | Value |
|---|---|
| Joule (J) | 1 |
| British Thermal Unit (BTU) | 0.00094781712 |
| Calorie (cal) | 0.2388459 |
| Electronvolt (eV) | 6.2415064e+18 |
| Erg (erg) | 1 |
| Foot-Pound (ft·lbf) | 0.73756215 |
| Kilocalorie (kcal) | 0.0002388459 |
| Kilojoule (kJ) | 0.001 |
| Kilowatt-Hour (kWh) | 2.7777778e-7 |
| Megajoule (MJ) | 1e-6 |
| Newton-Meter (N·m) | 1 |
| Therm (thm) | 9.4781339e-9 |
| Watt-Hour (Wh) | 0.00027777778 |
This converter uses the joule (J) as its base unit — the SI unit of energy equal to the work done when a force of one newton moves an object one meter.
Every energy unit has a known ratio to the joule, and the converter multiplies by the source factor then divides by the target factor, all with BigNumber precision.
Convert 1 kilowatt-hour to joules: 1 × 3,600,000 = 3.6 × 10⁶ J. One kWh equals exactly 3.6 megajoules because a kilowatt sustained for 3,600 seconds delivers 3,600,000 joules.
One kilowatt-hour (kWh) equals exactly 3,600,000 joules (3.6 MJ). A kilowatt-hour is the energy consumed by a 1,000-watt appliance running for one hour, and is the standard billing unit for electricity.
A British Thermal Unit (BTU) is the amount of heat needed to raise one pound of water by one degree Fahrenheit. One BTU equals approximately 1,055 joules. BTUs are commonly used in HVAC, heating, and energy ratings in the United States.
One kilocalorie (kcal) equals 1,000 calories. The “Calories” listed on food labels are actually kilocalories. One calorie (small c) is the energy needed to raise one gram of water by one degree Celsius, equal to about 4.1868 joules.