7 min read
2026-02-12
SI unit. 1 J = work done by a force of 1 N at a distance of 1 m.
1 calorie = 4.184 J. In dietetics, kilocalories (kcal) are used: 1 kcal = 1000 cal = 4184 J.
Unit of electrical energy. 1 kWh = 3,600,000 J. This is where electricity is counted.
British thermal unit. 1 BTU = 1055.06 J. Used in heating and air conditioning systems.
Unit for particle physics. 1 eV = 1.602 × 10⁻¹⁹ J.
| Unit | In joules |
|---|---|
| 1 calorie | 4.184 |
| 1 kcal | 4 184 |
| 1 BTU | 1 055.06 |
| 1 kWh | 3,600,000 |
| 1 eV | 1.602 × 10⁻¹⁹ |
1 liter of gasoline ≈ 34.2 MJ ≈ 8,170 kcal
Chocolate bar ≈ 250 kcal ≈ 1,046 kJ
Daily human norm ≈ 2000–2500 kcal
See also: Power converter, Pressure converter, Temperature converter