Calorie to Watt Hour Converter
Energy · unit-converter
Convert Calorie to Watt Hour with fixed input and output units, a step-by-step formula line, and reference tables. Factors are joule-based; food energy uses thermochemical calories. The full Energy Converter also includes MMBtu, toe, thermal kWh, and MeV/GeV.
Calculator
From: Calorie (cal)
To: Watt Hour (wh)
About Calorie
The small calorie (cal) is 4.184 J in this converter (thermochemical). Do not confuse with the dietary kilocalorie (kcal).
About Watt Hour
One watt-hour is 3,600 J—the energy from 1 W for one hour. Common for small batteries and device ratings.
How to convert calories to watt hours
1 calorie is equal to 0.00116222222222 watt hour when both are expressed in joule-equivalents:
1 cal = (4.184 J ÷ 3,600 J) wh = 0.00116222222222 wh
Each calorie is defined as 4.184 J and each watt hour as 3,600 J in this tool, so one cal equals 4.184 ÷ 3,600 wh = 0.00116222222222 wh.
Let d(cal) be the numeric amount in Calorie (cal), and d(wh) the amount in Watt Hour (wh). Then:
d(wh) = d(cal) × (4.184 / 3,600)
Equivalently, divide by how many cal fit into one wh (joules per wh divided by joules per cal):
d(wh) = d(cal) ÷ 860.42065009560224
Or: watt hour = calorie ÷ 860.42065009560224
Examples
Example #1: Convert 1 cal to watt hour
1 cal = 1 cal × (4.184/3,600) wh = 0.0011622222 wh
1 cal = 1 cal ÷ 860.42065009560224 = 0.0011622222 wh
Example #2: Convert 10 cal to watt hour
10 cal = 10 cal × (4.184/3,600) wh = 0.0116222222 wh
10 cal = 10 cal ÷ 860.42065009560224 = 0.0116222222 wh
Summary
To convert Calorie to Watt Hour, multiply the value in cal by the ratio of joules per cal divided by joules per wh. Equivalently: value_wh = value_cal × (4.184 / 3600). Numerically, 1 cal equals 0.0011622222222222223 wh.
Relationship context
You are converting between food / nutrition energy (calories) (Calories) and electrical energy (watt-hours) (Watt Hours). All values are mapped through joules first. The numeric factor is 1.162222e-3.
Conversion tables
| Calorie (cal) | Watt Hour (wh) |
|---|---|
| 0.1 | 0.0001162222 |
| 1 | 0.0011622222 |
| 2 | 0.0023244444 |
| 3 | 0.0034866667 |
| 4 | 0.0046488889 |
| 5 | 0.0058111111 |
| 6 | 0.0069733333 |
| 7 | 0.0081355556 |
| 8 | 0.0092977778 |
| 9 | 0.01046 |
| Calorie (cal) | Watt Hour (wh) |
|---|---|
| 10 | 0.0116222222 |
| 20 | 0.0232444444 |
| 30 | 0.0348666667 |
| 40 | 0.0464888889 |
| 50 | 0.0581111111 |
| 60 | 0.0697333333 |
| 70 | 0.0813555556 |
| 80 | 0.0929777778 |
| 90 | 0.1046 |
| 100 | 0.1162222222 |