Watt-hours to Kilocalories Converter
Enter the energy in watt-hours below to convert it to kilocalories.
Convert Watt-hours to Kilocalories
Enter a value in watt-hours (Wh) to convert to kilocalories (kcal).
Watt-hour to Kilocalorie Conversion Table
Table showing various watt-hour measurements converted to kilocalories. Click any preset value or arrow to load it into the converter.
| Watt-hours (Wh) | Kilocalories (kcal) |
|---|---|
| 1 Wh | 0.8604207 kcal |
| 2 Wh | 1.7208413 kcal |
| 2.5 Wh | 2.1510516 kcal |
| 5 Wh | 4.3021033 kcal |
| 10 Wh | 8.6042065 kcal |
| 15 Wh | 12.9063098 kcal |
| 20 Wh | 17.208413 kcal |
| 25 Wh | 21.5105163 kcal |
| 30 Wh | 25.8126195 kcal |
| 50 Wh | 43.0210325 kcal |
How to Convert Watt-hours to Kilocalories
To convert watt-hours to kilocalories, multiply the energy by the following conversion ratio: 0.8604207 kilocalories/watt-hour.
Since one watt-hour is equal to 0.8604207 kilocalories, you can use this simple formula to convert:
The energy in kilocalories is equal to the energy in watt-hours multiplied by 0.8604207.
For example, here's how to convert 5 watt-hours to kilocalories using the formula above.
How Many Kilocalories Are in a Watt-hour?
There are 0.8604207 kilocalories in a watt-hour, which is why we use this value in the formula above.
Our watt-hour to kilocalorie calculator automatically converts your energy measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Watt-hours and kilocalories are both units used to measure energy. Keep reading to learn more about each unit.
What Is a Watt-hour?
A watt-hour is a unit of energy equal to 3,600 joules (J), the base unit for energy. Equal to 3,600 Joules. [1]
The watt-hour is classified as a metric and SI-compatible unit of energy. Watt-hours can be abbreviated as Wh; for example, 1 watt-hour can be written as 1 Wh.
When working with watt-hours (Wh) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, watt-hours (Wh) are widely used across large-scale industrial, bulk, and macro-level energy specifications within SI metric workflows, engineering documentation, and technical data sheets.
What Is a Kilocalorie?
A kilocalorie is a unit of energy equal to 4,184 joules (J), the base unit for energy. Dietary Calorie equal to 1,000 small calories (4,184 Joules). [2]
The kilocalorie is classified as a standard unit of energy. Kilocalories can be abbreviated as kcal; for example, 1 kilocalorie can be written as 1 kcal.
In the metric system, "kilo" is the standard SI prefix for thousands, or 10³. This makes the kilocalorie (kcal) a convenient decimal multiple of the calorie (cal).
In practice, kilocalories (kcal) are widely used across large-scale industrial, bulk, and macro-level energy specifications within international standard workflows, engineering documentation, and technical data sheets.
When converting energy between watt-hours (Wh) and kilocalories (kcal), keep full floating-point precision (1 Wh = 0.8604207 kcal; 1 kcal = 1.1622222 Wh) during intermediate calculations and round only the final kilocalorie figure to match your instrument tolerance.
More Watt-hour & Kilocalorie Conversions
Need to calculate in the opposite direction? Use our kilocalories to watt-hours calculator to switch your starting unit immediately. You can also explore related tools such as converting kilocalories to watt-hours, converting calories to kilocalories, or converting kilojoules to kilocalories.
Convert from Watt-hours
Frequently Asked Questions
References
- [1]NIST CODATA StandardNIST CODATA (CODATA Energy & Thermodynamic Constants)·Energy Metrology Standard — Watt-hours (Wh) to Kilocalories (kcal)
- [2]NIST SP 811 SpecificationNIST SP 811 (NIST SP 811 App. B.9 (Energy, Work & Heat))·Unit Specifications: Watt-hour (Wh) & Kilocalorie (Food Calorie) (kcal)
- [3]BIPM ReferenceBIPM (Derived SI Unit: Joule (J))·Conversion Factors & Mathematical Basis (Wh to kcal)