Watt-hour to Calorie Converter (Wh to cal)
1 watt-hour equals 860.42065 calories (cal) — multiply watt-hours by 860.42065 to convert. A watt-hour is 3,600 joules, and one thermochemical calorie is 4.184 joules, so 3600 ÷ 4.184 ≈ 860.42065 calories. Note these are small (gram) calories, not the kilocalories on food labels.
The formula
Multiply watt-hours by the factor to get calories:
calories = watt-hours × 860.42065For example, 5 Wh × 860.42065 = 4,302.10325 cal. To reverse, divide by 860.42065 (or multiply calories by 0.00116222).
Conversion table
| Watt-hours (Wh) | Calories (cal) |
|---|---|
| 1 | 860.42065 |
| 2 | 1,720.84130 |
| 5 | 4,302.10325 |
| 10 | 8,604.20650 |
| 25 | 21,510.51625 |
| 50 | 43,021.03250 |
| 100 | 86,042.06500 |
| 500 | 430,210.32500 |
| 1000 | 860,420.65000 |
How to convert online
- Type the number of watt-hours into the first box.
- Read the equivalent calorie value instantly in the second box.
- Type a calorie value to convert back to watt-hours — it works both ways.
Use the Watt-hour to Calorie Converter — free and instant in your browser.
Where this conversion is used
This conversion links electrical energy with thermal energy — useful in physics and engineering when comparing the electricity a device uses (watt-hours) against heat output (calories), and in analyses of heating elements, batteries, and energy-efficiency calculations.
FAQ
How many calories are in a watt-hour?
One watt-hour equals 860.42065 calories (small calories). So 10 Wh = 8,604.20650 cal.
What is the formula to convert watt-hours to calories?
Multiply the watt-hour value by 860.42065. In symbols, cal = Wh × 860.42065.
How do I convert calories back to watt-hours?
Divide calories by 860.42065, or multiply by 0.00116222.
Are these food calories?
No — these are small (gram) calories. Food labels use kilocalories, which are 1,000 times larger.
Related converters
- Calorie to Watt-hour Converter
- Watt-hour to Joule Converter
- Watt-hour to Kilocalorie Converter
- Watt-hour to Kilowatt-hour Converter
Built by ByteVancer
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Recommended reading
Watt-hour to Kilowatt-hour (Wh to kWh) Converter
1 watt-hour equals 0.001 kilowatt-hours. Divide by 1000 to convert Wh to kWh, with the exact formula and a handy reference table.
Watt-hour to Kilojoule (Wh to kJ) Converter
1 watt-hour equals 3.6 kilojoules exactly. Use the formula, an easy factor and a reference table to convert Wh to kJ instantly and free.
Watt-hour to Kilocalorie (Wh to kcal) Converter
1 watt-hour equals 0.86042065 kilocalories. Use the exact factor, formula and a reference table to convert Wh to kcal fast and free.
Watt-hour to Joule Converter (Wh to J) + Formula
1 watt-hour equals 3,600 joules. Convert Wh to joules with the exact factor, a simple formula, and a reference table of common values.