Watt-hours to Kilocalories Converter
1 watt-hour ≈ 0.86042065 kilocalories
This is the unit written as "Calories" on nutrition labels.
1 watt-hour equals 0.860421 kilocalories
How to convert watt-hours to kilocalories
Calories here are thermochemical (4.184 J), while BTU uses the International Table definition. A kilowatt-hour is energy (3.6 MJ), not power; a food Calorie is a kilocalorie.
kcal = Wh × 0.8604206501One watt-hour is 0.8604206501 kilocalories, so a single multiplication converts any value.
8.60421 kcal ≈ 10 × 0.8604206501This is the unit written as "Calories" on nutrition labels.
Watt-hours to kilocalories conversion table
Common values in watt-hours, converted to kilocalories.
| Watt-hours (Wh) | Kilocalories (kcal) |
|---|---|
| 1 | 0.86042065 |
| 2 | 1.7208413 |
| 3 | 2.581262 |
| 4 | 3.4416826 |
| 5 | 4.3021033 |
| 10 | 8.6042065 |
| 20 | 17.208413 |
| 25 | 21.510516 |
| 50 | 43.021033 |
| 100 | 86.042065 |
| 250 | 215.10516 |
| 500 | 430.21033 |
| 1,000 | 860.42065 |
About these units
watt-hourWh
One watt sustained for one hour: exactly 3,600 joules.
kilocaloriekcal
One thousand thermochemical calories: exactly 4,184 joules.
Sources and precision
Table results are rounded to 8 significant digits; formula constants may be rounded to 10. Worked example answers use 6 significant digits. The converter starts at 6 significant digits and lets you change display precision. Calculations use the stored factors without intermediate rounding. Exact unit definitions do not make an input measurement more precise; conventional and measured factors follow the assumptions stated here.