Kilocalories to Watt-hours Converter
Enter the energy in kilocalories below to convert it to watt-hours.
Convert Kilocalories to Watt-hours
Enter a value in kilocalories (kcal) to convert to watt-hours (Wh).
Kilocalorie to Watt-hour Conversion Table
Table showing various kilocalorie measurements converted to watt-hours. Click any preset value or arrow to load it into the converter.
| Kilocalories (kcal) | Watt-hours (Wh) |
|---|---|
| 1 kcal | 1.1622222 Wh |
| 2 kcal | 2.3244444 Wh |
| 2.5 kcal | 2.9055556 Wh |
| 5 kcal | 5.8111111 Wh |
| 10 kcal | 11.6222222 Wh |
| 15 kcal | 17.4333333 Wh |
| 20 kcal | 23.2444444 Wh |
| 25 kcal | 29.0555556 Wh |
| 30 kcal | 34.8666667 Wh |
| 50 kcal | 58.1111111 Wh |
How to Convert Kilocalories to Watt-hours
To convert kilocalories to watt-hours, multiply the energy by the following conversion ratio: 1.1622222 watt-hours/kilocalorie.
Since one kilocalorie is equal to 1.1622222 watt-hours, you can use this simple formula to convert:
The energy in watt-hours is equal to the energy in kilocalories multiplied by 1.1622222.
For example, here's how to convert 5 kilocalories to watt-hours using the formula above.
How Many Watt-hours Are in a Kilocalorie?
There are 1.1622222 watt-hours in a kilocalorie, which is why we use this value in the formula above.
Our kilocalorie to watt-hour calculator automatically converts your energy measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Kilocalories and watt-hours are both units used to measure energy. Keep reading to learn more about each unit.
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). [1]
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.
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. [2]
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.
When converting energy between kilocalories (kcal) and watt-hours (Wh), keep full floating-point precision (1 kcal = 1.1622222 Wh; 1 Wh = 0.8604207 kcal) during intermediate calculations and round only the final watt-hour figure to match your instrument tolerance.
More Kilocalorie & Watt-hour Conversions
Need to calculate in the opposite direction? Use our watt-hours to kilocalories calculator to switch your starting unit immediately. You can also explore related tools such as converting watt-hours to kilocalories, converting ampere-hours to watt-hours, or converting milliampere-hours to watt-hours.
Convert from Kilocalories
Frequently Asked Questions
References
- [1]NIST CODATA StandardNIST CODATA (CODATA Energy & Thermodynamic Constants)·Energy Metrology Standard — Kilocalories (kcal) to Watt-hours (Wh)
- [2]NIST SP 811 SpecificationNIST SP 811 (NIST SP 811 App. B.9 (Energy, Work & Heat))·Unit Specifications: Kilocalorie (Food Calorie) (kcal) & Watt-hour (Wh)
- [3]BIPM ReferenceBIPM (Derived SI Unit: Joule (J))·Conversion Factors & Mathematical Basis (kcal to Wh)