Convert Kilocalories to Kilowatt-hours
Kilocalories to kilowatt-hours is the conversion you need when a food or heat figure is in Calories but you want it in the electrical energy unit on your power bill. One kilocalorie is approximately 0.00116222 kilowatt-hours, so the kilowatt-hour number always comes out much smaller.
Kilocalories to Kilowatt-hours conversion table
| Kilocalories (kcal) | Kilowatt-hours (kWh) |
|---|---|
| 1 | 0.001162 |
| 2 | 0.002324 |
| 3 | 0.003487 |
| 5 | 0.005811 |
| 10 | 0.011622 |
| 20 | 0.023244 |
| 50 | 0.058111 |
| 100 | 0.116222 |
| 500 | 0.581111 |
| 1,000 | 1.162222 |
The formula
To convert kilocalories to kilowatt-hours, multiply the number of kilocalories by 0.0011622222222222223 (about 0.00116222):
kilowatt-hours = kilocalories × 0.0011622222222222223
A worked example
Say you have 860 kcal — 860 food Calories — and want it in kilowatt-hours:
860 × 0.0011622222222222223 = 0.99951111 kWh
So 860 kilocalories is about 0.99951111 kilowatt-hours — roughly one kWh.
Why it's an approximation
A "kilocalorie" (kcal) is the "Calorie" you see on food nutrition labels — one food Calorie is one kilocalorie. The kilocalorie itself is exact (4184 joules), but a kilowatt-hour is a big, round electrical unit — the energy of a 1000-watt device running for an hour — and the two don't divide evenly. That leaves the factor 0.00116222 with digits that repeat forever, so it's rounded for everyday use.
When you'll use it
Comparing the energy in food against what shows up on an electricity bill, sizing the heat output of a process against household power use, and putting Calories and kilowatt-hours onto the same scale.
Frequently asked questions
How many kilowatt-hours are in a kilocalorie?
About 0.00116222 kilowatt-hours. It's a rounded figure — the exact value repeats past several decimal places, so 0.00116222 is the practical number to use.
Is a kilocalorie the same as a food Calorie?
Yes. The 'Calorie' with a capital C on a nutrition label is a kilocalorie — one food Calorie is one kilocalorie. So the energy in 860 food Calories is about 0.99951111 kilowatt-hours, roughly one kWh.
Is the kilocalories to kilowatt-hours conversion exact?
No. A kilowatt-hour is a much larger, round electrical unit that doesn't divide evenly into calories, so the factor 0.00116222 is rounded for everyday use. More decimal places give you more precision if you need it.