Convert Watt-hours to Kilocalories
One watt-hour equals 0.860421 kilocalories. Type any value to convert watt-hours to kilocalories instantly — with a full reference table below.
Convert Watt-hours to Kilocalories
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How to convert Watt-hours to Kilocalories
To convert watt-hours to kilocalories, multiply by 0.860421. One watt-hour equals 0.860421 kcal, and one kilocalorie equals 1.162222 Wh.
- Take the value in watt-hours — for example 7.5 Wh.
- Multiply by 0.860421 (the number of kilocalories in one watt-hour).
- 7.5 × 0.860421 = 6.453155 kcal.
Quick mental estimate: Multiply the number of watt-hours by 0.86 (accurate to better than 0.05%).
Watt-hours to Kilocalories conversion table
| Watt-hours | Kilocalories |
|---|---|
| 1 Wh | 0.860421 kcal |
| 2 Wh | 1.720841 kcal |
| 5 Wh | 4.302103 kcal |
| 10 Wh | 8.604207 kcal |
| 20 Wh | 17.20841 kcal |
| 50 Wh | 43.02103 kcal |
| 100 Wh | 86.04207 kcal |
| 200 Wh | 172.0841 kcal |
| 500 Wh | 430.2103 kcal |
| 1,000 Wh | 860.4207 kcal |
| 2,000 Wh | 1,720.841 kcal |
| Kilocalories | Watt-hours |
|---|---|
| 1 kcal | 1.162222 Wh |
| 2 kcal | 2.324444 Wh |
| 5 kcal | 5.811111 Wh |
| 10 kcal | 11.62222 Wh |
| 20 kcal | 23.24444 Wh |
| 50 kcal | 58.11111 Wh |
| 100 kcal | 116.2222 Wh |
| 200 kcal | 232.4444 Wh |
| 500 kcal | 581.1111 Wh |
| 1,000 kcal | 1,162.222 Wh |
| 2,000 kcal | 2,324.444 Wh |
About converting Watt-hours to Kilocalories
Watt-hours (Wh) and Kilocalories (kcal) are both units of energy. The exact factor is 1 Wh = 0.860421 kcal, so multiply by 0.860421 to go from watt-hours to kilocalories (or divide to go back).
The conversion runs entirely in your browser. Need the reverse? Use the Kilocalories to Watt-hours converter, or the full unit converter for every unit at once.
Real-world energy in watt-hours and kilocalories
| Example | Watt-hours | Kilocalories |
|---|---|---|
| One food Calorie (kcal) | 1.162222 Wh | 1 kcal |
| A 100 W bulb running for one hour | 100 Wh | 86.04207 kcal |
| A smartphone battery (≈19 Wh) | ≈ 19.25 Wh | ≈ 16.5631 kcal |
| A 2,000 kcal daily diet | 2,324.444 Wh | 2,000 kcal |
| One kilowatt-hour | 1,000 Wh | 860.4207 kcal |
“≈” marks typical values; the rest are defined or measured figures.
The units
One watt for one hour: exactly 3,600 J.
Used for: Battery capacity (power banks, laptops).
1,000 calories, exactly 4,184 J — the 'Calorie' on food labels.
Used for: Nutrition and diets.
The thermochemical calorie is exactly 4.184 J and a kilowatt-hour is exactly 3.6 MJ, so these factors are exact.