# Calories to Watt-hours Conversion

Enter the energy in calories below to get the value converted to watt-hours.

**Results in Watt-hours:**

## How to Convert Calories to Watt-hours

To convert a calorie measurement to a watt-hour measurement, multiply the energy by the conversion ratio. One calorie is equal to 0.001162 watt-hours, so use this simple formula to convert:

The energy in watt-hours is equal to the calories multiplied by 0.001162.

**For example,**here's how to convert 500 calories to watt-hours using the formula above.

Calories and watt-hours are both units used to measure energy. Keep reading to learn more about each unit of measure.

## Calories

One calorie is equal to the heat needed to raise the temperature of one gram of water from 14.5 to 15.5 degrees Celsius.

When measuring the energy content in foods, the large calorie, or kilocalorie is used, but it's often still just called a "calorie." When both the calorie and large calorie are used in the same context it is common to refer to the calorie as a "small calorie."

Calories can be abbreviated as *cal*; for example, 1 calorie can be written as 1 cal.

## Watt-hours

The watt-hour is a measure of electrical energy equal to one watt of power over a one hour period.

Watt-hours are usually abbreviated as *Wh*, although the formally adopted expression is *W·h*. The abbreviation *W h* is also sometimes used. For example, 1 watt-hour can be written as 1 Wh, 1 W·h, or 1 W h.

In formal expressions, the centered dot (·) or space is used to separate units used to indicate multiplication in an expression and to avoid conflicting prefixes being misinterpreted as a unit symbol.^{[1]}

## Calorie to Watt-hour Conversion Table

Calories | Watt-hours |
---|---|

1 cal | 0.001162 Wh |

2 cal | 0.002324 Wh |

3 cal | 0.003487 Wh |

4 cal | 0.004649 Wh |

5 cal | 0.005811 Wh |

6 cal | 0.006973 Wh |

7 cal | 0.008136 Wh |

8 cal | 0.009298 Wh |

9 cal | 0.01046 Wh |

10 cal | 0.011622 Wh |

20 cal | 0.023244 Wh |

30 cal | 0.034867 Wh |

40 cal | 0.046489 Wh |

50 cal | 0.058111 Wh |

60 cal | 0.069733 Wh |

70 cal | 0.081356 Wh |

80 cal | 0.092978 Wh |

90 cal | 0.1046 Wh |

100 cal | 0.116222 Wh |

200 cal | 0.232444 Wh |

300 cal | 0.348667 Wh |

400 cal | 0.464889 Wh |

500 cal | 0.581111 Wh |

600 cal | 0.697333 Wh |

700 cal | 0.813556 Wh |

800 cal | 0.929778 Wh |

900 cal | 1.046 Wh |

1,000 cal | 1.1622 Wh |

## References

- Bureau International des Poids et Mesures, The International System of Units (SI), 9th edition, 2019, https://www.bipm.org/utils/common/pdf/si-brochure/SI-Brochure-9-EN.pdf