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Calories to Watt-hours Converter

Convert calories (thermochemical) (cal) to watt-hours (Wh), with the formula, a conversion table and exact factors.

Change the values and press Calculate to work out your own figures.

Enter an amount of energy, choose its unit and the unit you want. The answer is exact until it is shown, and the same value appears in every other unit.

A number, fraction (3/8), mixed number (1 1/2), scientific notation (2.5e6) or a simple sum such as 2*3.
The unit you want the answer in. Swap exchanges the two units.
Result
0.00116222222222 Wh
joules (watt-seconds)
4.184 J
kilojoules
0.004184 kJ
megajoules
4.184 × 10⁻⁶ MJ
gigajoules
4.184 × 10⁻⁹ GJ
kilocalories (food Calories)
0.001 kcal
megacalories
1 × 10⁻⁶ Mcal
kilowatt-hours
1.16222222222 × 10⁻⁶ kWh
megawatt-hours
1.16222222222 × 10⁻⁹ MWh
British thermal units (IT)
0.00396566683139 Btu
million Btu
3.96566683139 × 10⁻⁹ MMBtu
therms (100,000 Btu)
3.96566683139 × 10⁻⁸ thm
quads (10¹⁵ Btu)
3.96566683139 × 10⁻¹⁸ quad
electronvolts
2.61144739675 × 10¹⁹ eV
kiloelectronvolts
2.61144739675 × 10¹⁶ keV
megaelectronvolts
26,114,473,967,500 MeV

1 cal = 0.00116222222222 Wh

Show the working
  1. 1 cal = 0.00116222222222 Wh
  2. 1 × 0.00116222222222 = 0.00116222222222 Wh

How to convert calories to watt-hours

1 cal = 0.00116222222222 Wh, so multiply by 0.00116222222222 to go from calories (thermochemical) to watt-hours. Going the other way, 1 Wh = 860.420650096 cal.

Wh = cal × 0.00116222222222
cal = Wh × 860.420650096

Worked example:

1 cal = 0.00116222222222 Wh
5 × 0.00116222222222 = 0.00581111111111 Wh

Calories to watt-hours table

CaloriesWatt-hours
1 cal0.00116222222222 Wh
2 cal0.00232444444444 Wh
3 cal0.00348666666667 Wh
4 cal0.00464888888889 Wh
5 cal0.00581111111111 Wh
6 cal0.00697333333333 Wh
7 cal0.00813555555556 Wh
8 cal0.00929777777778 Wh
9 cal0.01046 Wh
10 cal0.0116222222222 Wh
15 cal0.0174333333333 Wh
20 cal0.0232444444444 Wh
25 cal0.0290555555556 Wh
30 cal0.0348666666667 Wh
40 cal0.0464888888889 Wh
50 cal0.0581111111111 Wh
75 cal0.0871666666667 Wh
100 cal0.116222222222 Wh
250 cal0.290555555556 Wh
500 cal0.581111111111 Wh
1000 cal1.16222222222 Wh

About the units

Calories (cal)
Calories (thermochemical), a specialised unit. The thermochemical calorie, 4.184 J, used on US food labels as 1 Calorie = 1 kilocalorie. Definition: NIST SP 811 Appendix B.8, factors for units listed alphabetically.

Formula version 0.1.0Reviewed