Joule (J)
The SI unit of energy: one newton-meter.
Result
1 joule = 0.001 kilojoules
Joule at a glance
| Unit name | Joule (plural: joules) |
|---|---|
| Symbol | J |
| Quantity measured | Energy |
| Measurement system | SI |
| Also known as | j, joules |
| Definition exact? | Yes — exact by definition |
1 joule in other energy units
| Unit | 1 J equals |
|---|---|
| Kilojoule | 0.001 kJ |
| Megajoule | 0.000001 MJ |
| Calorie | 0.239005736 cal |
| Kilocalorie | 0.000239006 kcal |
| Watt-hour | 0.000277778 Wh |
| Kilowatt-hour | 0.000000278 kWh |
| Megawatt-hour | 2.77777778 × 10⁻¹⁰ MWh |
| Electronvolt | 6.24150907 × 10¹⁸ eV |
| British thermal unit | 0.000947817 BTU |
| Therm | 9.4781712 × 10⁻⁹ thm |
| Foot-pound | 0.737562149 ft·lb |
Popular joule conversions
Frequently asked questions
- What is a joule?
- The SI unit of energy: one newton-meter.
- What is the symbol for the joule?
- The symbol for the joule is J. It measures energy.
- How many kilojoules are in a joule?
- 1 joule = 0.001 kilojoules.
- How many kilocalories are in a joule?
- 1 joule = 0.000239006 kilocalories.
- How many kilowatt-hours are in a joule?
- 1 joule = 0.000000278 kilowatt-hours.