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Energy
Kilocalories to Watt-hours
Convert kilocalories (kcal) to watt-hours (Wh). Type a value below to see the result update instantly. Reference table and formula included.
Calculator
1 kcal = 1.1622 Wh
Kilocalories to Watt-hours Conversion Table
Common values, ready to copy:
| kilocalories | watt-hours |
|---|---|
| 1 kcal | 1.1622 Wh |
| 2 kcal | 2.3244 Wh |
| 5 kcal | 5.8111 Wh |
| 10 kcal | 11.6222 Wh |
| 25 kcal | 29.0556 Wh |
| 50 kcal | 58.1111 Wh |
| 100 kcal | 116.22 Wh |
| 1,000 kcal | 1162.22 Wh |
Formula
watt-hours = kilocalories × 1.16222222e+0
Energy uses the SI joule. Food calories (kcal) are 1,000 small calories: 1 kcal = 4,184 J. 1 kWh = 3.6 MJ = 3,600,000 J. 1 BTU = 1,055.06 J.
About Kilocalories and Watt-hours
Kilocalories (kcal): A thousand small calories, or about 4,184 J; this is what 'calories' means on US food labels. Common uses: Food energy labeling in the US (a 'Calorie' on a US food label is a kilocalorie), nutrition tracking, and exercise energy expenditure.
Watt-hours (Wh): The energy consumed by a 1-watt device in 1 hour; equals 3,600 joules. Common uses: Small battery capacities (laptop batteries are typically 40-100 Wh), and lighting energy use.
How the conversion works
Energy uses the SI joule. Food calories (kcal) are 1,000 small calories: 1 kcal = 4,184 J. 1 kWh = 3.6 MJ = 3,600,000 J. 1 BTU = 1,055.06 J.
The exact relationship is watt-hours = kilocalories × 1.16222222e+0, which the calculator at the top of this page applies in both directions. Type into either field and the other updates immediately.
When this conversion matters
Converting between kilocalories and watt-hours comes up wherever energy measurements move between systems — from one country's conventions to another's, from a scientific reference to a practical specification, or from one industry's working unit to another's. The calculator and reference table above cover the everyday range; for unusual values you can type any number into either field.