Watt-hours (W·h) to Kilocalories (kcal) Conversion
Watt-hours
The watt-hour (W·h) is a unit of energy equal to exactly 3,600 joules, defined as the energy consumed by a one-watt device operating for one hour. It is used in electrical engineering and consumer electronics for expressing battery capacities: a smartphone battery typically holds 10–20 Wh. In aviation, aircraft battery capacities are specified in watt-hours for international transport regulations (lithium batteries above 100 Wh face restrictions).
Kilocalories
The kilocalorie (kcal), commonly called a "Calorie" (capital C) in nutritional contexts, is a unit of energy equal to exactly 4,184 joules. It represents the energy needed to raise 1 kg of water by 1 °C. In nutrition, all food energy values are expressed in kcal per gram: carbohydrates and protein provide 4 kcal/g; fat provides 9 kcal/g; alcohol provides 7 kcal/g. An average adult requires approximately 2,000–2,500 kcal per day to maintain body weight.
| Watt-hours (W·h) | Kilocalories (kcal) |
|---|---|
| 0.1 W·h | 0.08604206500956 kcal |
| 1 W·h | 0.8604206500956 kcal |
| 2 W·h | 1.7208413001912 kcal |
| 3 W·h | 2.5812619502868 kcal |
| 5 W·h | 4.302103250478 kcal |
| 10 W·h | 8.604206500956 kcal |
| 20 W·h | 17.208413001912 kcal |
| 30 W·h | 25.812619502868 kcal |
| 50 W·h | 43.02103250478 kcal |
| 100 W·h | 86.04206500956 kcal |
| 1000 W·h | 860.4206500956 kcal |
Frequently Asked Questions (FAQ)
How many kilocalories are in 1 watt-hours?
1 watt-hours (W·h) is exactly 0.860421 kilocalories (kcal).
How do I convert watt-hours to kilocalories?
Multiply the value in watt-hours by 0.860421 to get the result in kilocalories. Or use the converter above — type any number and see the result instantly.