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Kilocalories to Watt-hours Converter

Convert kilocalories (food Calories) (kcal) 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
1.16222222222 Wh
joules (watt-seconds)
4,184 J
kilojoules
4.184 kJ
megajoules
0.004184 MJ
gigajoules
4.184 × 10⁻⁶ GJ
calories (thermochemical)
1,000 cal
megacalories
0.001 Mcal
kilowatt-hours
0.00116222222222 kWh
megawatt-hours
1.16222222222 × 10⁻⁶ MWh
British thermal units (IT)
3.96566683139 Btu
million Btu
3.96566683139 × 10⁻⁶ MMBtu
therms (100,000 Btu)
3.96566683139 × 10⁻⁵ thm
quads (10¹⁵ Btu)
3.96566683139 × 10⁻¹⁵ quad
electronvolts
2.61144739675 × 10²² eV
kiloelectronvolts
2.61144739675 × 10¹⁹ keV
megaelectronvolts
2.61144739675 × 10¹⁶ MeV

1 kcal = 1.16222222222 Wh

Show the working
  1. 1 kcal = 1.16222222222 Wh
  2. 1 × 1.16222222222 = 1.16222222222 Wh

How to convert kilocalories to watt-hours

1 kcal = 1.16222222222 Wh, so multiply by 1.16222222222 to go from kilocalories (food Calories) to watt-hours. Going the other way, 1 Wh = 0.860420650096 kcal.

Wh = kcal × 1.16222222222
kcal = Wh × 0.860420650096

Worked example:

1 kcal = 1.16222222222 Wh
5 × 1.16222222222 = 5.81111111111 Wh

Kilocalories to watt-hours table

KilocaloriesWatt-hours
1 kcal1.16222222222 Wh
2 kcal2.32444444444 Wh
3 kcal3.48666666667 Wh
4 kcal4.64888888889 Wh
5 kcal5.81111111111 Wh
6 kcal6.97333333333 Wh
7 kcal8.13555555556 Wh
8 kcal9.29777777778 Wh
9 kcal10.46 Wh
10 kcal11.6222222222 Wh
15 kcal17.4333333333 Wh
20 kcal23.2444444444 Wh
25 kcal29.0555555556 Wh
30 kcal34.8666666667 Wh
40 kcal46.4888888889 Wh
50 kcal58.1111111111 Wh
75 kcal87.1666666667 Wh
100 kcal116.222222222 Wh
250 kcal290.555555556 Wh
500 kcal581.111111111 Wh
1000 kcal1,162.22222222 Wh

About the units

Kilocalories (kcal)
Kilocalories (food Calories), a specialised unit. Definition: NIST SP 811 Appendix B.8, factors for units listed alphabetically.

Formula version 0.1.0Reviewed