Convert Kilocalories to Watt-hours
1 kilocalorie is 1.162222 Wh. One kilocalorie is exactly 1.16222222222 watt-hours.
One kilocalorie is 1.1622222 watt-hours. To convert kilocalories to watt-hours, multiply by 1.1622222; to go the other way, divide by 1.1622222 or multiply by 0.86042065. The factor is exact rather than rounded: it follows from NIST Special Publication 811. A thousand small calories, and what a food label means by "Calories" with a capital C.
Factor checked against the defining standard · How we check
- Kilocalories × 1.1622222
value * 1.162222222221.162 Wh
1 kilocalorie in every energy unit
| Unit | Value | Exact factor |
|---|---|---|
| joules | 4,184 J | × 4,184 |
| kilojoules | 4.184 kJ | × 4.184 |
| calories | 1,000 cal | × 1,000 |
| kilocalories (as entered) | 1 kcal | — |
| watt-hours | 1.162222222 Wh | × 1.16222222222 |
| kilowatt-hours | 0.001162222222 kWh | × 0.00116222222222 |
| British thermal units | 3.965666831 BTU | × 3.96566683139 |
| foot-pounds | 3,085.960033 ft·lbf | × 3,085.96003258 |
Factors are entered by hand from NIST Special Publication 811 rather than derived from a units library, so the ones that terminate are exact rather than rounded.
How do you convert kilocalories to watt-hours?
- 1.Take the measurement in kilocalories.
- 2.Multiply by 1.1622222 — that is how many watt-hours fit in one kilocalorie.
- 3.To go back the other way, divide by 1.1622222, or multiply by 0.86042065.
Worked example: 25 kilocalories to watt-hours
- Formula
- kcal × 1.1622222 = Wh
- Arithmetic
- 25 × 1.1622222 = 29.055556 Wh
- Answer
- 25 kcal = 29.055556 Wh
The factor is rounded for display; the figure above is computed from the full value.
Kilocalories to watt-hours conversion table
| Kilocalories | Watt-hours |
|---|---|
| 1 kcal | 1.162222 Wh |
| 2 kcal | 2.324444 Wh |
| 3 kcal | 3.486667 Wh |
| 4 kcal | 4.648889 Wh |
| 5 kcal | 5.811111 Wh |
| 6 kcal | 6.973333 Wh |
| 7 kcal | 8.135556 Wh |
| 8 kcal | 9.297778 Wh |
| 9 kcal | 10.46 Wh |
| 10 kcal | 11.622222 Wh |
| 12 kcal | 13.946667 Wh |
| 15 kcal | 17.433333 Wh |
| 20 kcal | 23.244444 Wh |
| 25 kcal | 29.055556 Wh |
| 50 kcal | 58.111111 Wh |
| 100 kcal | 116.222222 Wh |
| 200 kcal | 232.444444 Wh |
| 300 kcal | 348.666667 Wh |
| 500 kcal | 581.111111 Wh |
| 1000 kcal | 1,162.222222 Wh |
| 2000 kcal | 2,324.444444 Wh |
| 5000 kcal | 5,811.111111 Wh |
| 10000 kcal | 11,622.222222 Wh |
What is a kilocalorie?
A thousand small calories, and what a food label means by "Calories" with a capital C. A 2,000 calorie diet is 2,000 kcal, or 8.4 megajoules.
What is a watt-hour?
One watt sustained for an hour, so exactly 3,600 joules. Battery capacity is quoted here because it is an amount of energy rather than a rate.
How many watt-hours are in a kilocalorie?
One kilocalorie is 1.1622222 watt-hours. Going the other way, one watt-hour is 0.86042065 kilocalories. Both figures come from the same defined relation rather than from a measurement, which is why they are the same today as they were in 1959.
Every energy unit here
| Unit | Symbol | One of these is |
|---|---|---|
| Joules | J | the base unit |
| Kilojoules | kJ | 1000 joule |
| Calories | cal | 4.184 joule |
| Kilocalories | kcal | 4184 joule |
| Watt-hours | Wh | 3600 joule |
| Kilowatt-hours | kWh | 3600000 joule |
| British thermal units | BTU | 1055.0559 joule |
| Foot-pounds | ft·lbf | 1.3558179 joule |
Source: NIST Special Publication 811 — the thermochemical calorie is exactly 4.184 J
Questions people actually ask
- How many watt-hours are in a kilocalorie?
- 1.1622222. One watt sustained for an hour, so exactly 3,600 joules. Battery capacity is quoted here because it is an amount of energy rather than a rate.
- How do I convert watt-hours back to kilocalories?
- Divide by 1.1622222, or multiply by 0.86042065 — they are the same operation.
Other energy conversions
Watt-hours to kilocalories — the same conversion the other way.