calories to wh | Exact Decimal + Formula
1 Calorie = 0.001162 Watt-hour
One watt-hour equals about 860 calories (exactly 860.4206501 cal). Real-world use: chemistry, nutrition science, and physical-activity calculations. This page expresses those values in watt-hours, which is used for battery capacities and small appliance energy consumption. Type a value above for an instant answer; the exact formula and the reference table are below.
About Calorie and Watt-hour
Calorie (cal)
A (small) calorie is the energy needed to raise one gram of water by one degree Celsius, exactly 4.184 joules.
Where it's used: Chemistry, nutrition science, and physical-activity calculations.
Watt-hour (Wh)
A watt-hour is one watt of power sustained for one hour, equal to 3,600 joules.
Where it's used: Battery capacities and small appliance energy consumption.
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Formula
Wh = cal × 0.001162222
To convert Calorie to Watt-hour, use the formula displayed above.
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Calorie to Watt-hour: Quick Reference Table
| Calorie | Watt-hour (Decimal) | Fraction |
|---|---|---|
| 0.001 cal | 0.000001 Wh | - |
| 0.01 cal | 0.000012 Wh | - |
| 0.1 cal | 0.000116 Wh | - |
| 0.5 cal | 0.000581 Wh | - |
| 1 cal | 0.001162 Wh | - |
| 2 cal | 0.002324 Wh | - |
| 5 cal | 0.005811 Wh | - |
| 10 cal | 0.011622 Wh | - |
| 25 cal | 0.029056 Wh | - |
| 50 cal | 0.058111 Wh | - |
| 100 cal | 0.116222 Wh | - |
| 250 cal | 0.290556 Wh | - |
| 500 cal | 0.581111 Wh | - |
| 1000 cal | 1.162222 Wh | - |
cal to Wh Formula and Examples
Direct Formula
Wh = cal × 0.001162222 Inverse Formula
cal = Wh × 860.42065 Mental Math Shortcut
Divide the value by roughly 860.4 to quickly estimate the converted result.
Common Calorie to Watt-hour Calculations
- 5 cal = 0.005811 Wh
- 10 cal = 0.011622 Wh
- 50 cal = 0.058111 Wh
- 100 cal = 0.116222 Wh
- 500 cal = 0.581111 Wh
Precision & Practical Use
For example, 10 cal = 0.011622 Wh — roughly fractional unit measurement.
Utility bills and appliance ratings are given in whole kWh or BTU. Round converted figures to match the source document you're comparing against.
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How to Convert Calorie to Watt-hour
How many watt-hours are in one calorie?
One Calorie (cal) equals 0.001162 Watt-hour (Wh). To convert calories to watt-hours, multiply the calorie value by 0.001162.
How do I convert Calorie to Watt-hour?
Multiply your calorie value by 0.001162 to get the result in Watt-hour: Wh = cal × 0.001162. For example, 5 cal = 0.005811 Wh.
What is the formula for converting cal to Wh?
The conversion formula is Wh = cal × 0.001162. Use the calculator above for any value, and see the reference table below for common inputs from 0.001 to 1000.
Is there a quick mental estimate for cal to Wh?
Divide the value by roughly 860.4 to quickly estimate the converted result.
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