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Energy
Calories to Kilowatt-hours
Convert calories (cal) to kilowatt-hours (kWh). Type a value below to see the result update instantly. Reference table and formula included.
Calculator
1 cal = 1.1622e-6 kWh
Calories to Kilowatt-hours Conversion Table
Common values, ready to copy:
| calories | kilowatt-hours |
|---|---|
| 1 cal | 1.1622e-6 kWh |
| 2 cal | 2.3244e-6 kWh |
| 5 cal | 5.8111e-6 kWh |
| 10 cal | 1.1622e-5 kWh |
| 25 cal | 2.9056e-5 kWh |
| 50 cal | 5.8111e-5 kWh |
| 100 cal | 0.000116 kWh |
| 1,000 cal | 0.001162 kWh |
Formula
kilowatt-hours = calories × 1.16222222e-6
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 Calories and Kilowatt-hours
Calories (cal): Originally defined as the energy to raise one gram of water by one degree Celsius; exactly 4.184 J in the modern definition (the thermochemical calorie). Common uses: Scientific work in chemistry, where the small calorie is the natural unit for heat-of-reaction measurements.
Kilowatt-hours (kWh): A thousand watt-hours, or 3.6 MJ; the standard utility billing unit for residential and commercial electricity. Common uses: Electricity bills, residential and EV battery capacity (a typical EV battery is 50-100 kWh), and home solar generation.
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 kilowatt-hours = calories × 1.16222222e-6, 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 calories and kilowatt-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.