5 min read
2026-03-10
You know the power of the devices (W) and operating time → count kWh → multiply by the tariff.
Conversion kcal ↔ kJ. European labels often show energy in kJ. 1000 kJ ≈ 239 kcal.
Calculation of heat loss of buildings in BTU for selecting a heating system. 1 BTU/h ≈ 0.293 W.
300 W panel for 5 hours of sun = 1.5 kWh/day ≈ 45 kWh/month. Sufficient for LED lighting.
Comparison of gasoline and electricity: 1 liter of gasoline ≈ 9.5 kWh. An electric car consumes ~15 kWh/100 km.
| Application | Typical translation |
|---|---|
| Electricity | W → kWh |
| Food | kcal → kJ |
| Heating | BTU → kW |
| Fuel | MJ → kWh |
See also: Power converter, Fuel converter, Pressure converter