Joules to Watt Hours converter
J to Wh — 1 kcal = 4,184 J
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Convert Joules to all units
kJ Kilojoules—
cal Calories—
kcal Kilocalories—
Wh Watt Hours—
kWh Kilowatt Hours—
BTU Btu—
eV Electronvolts—
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Conversion Formula
Joules to Watt Hours: 1 kcal = 4,184 J
Example: To convert 500 kcal to joules: 500 × 4,184 = 2,092,000 J
Quick Reference: Joules to Watt Hours
| Joules | Watt Hours |
|---|---|
| 1 J | 0.000278 Wh |
| 5 J | 0.001389 Wh |
| 10 J | 0.002778 Wh |
| 25 J | 0.006944 Wh |
| 50 J | 0.013889 Wh |
| 100 J | 0.027778 Wh |
| 500 J | 0.138889 Wh |
| 1,000 J | 0.277778 Wh |
Frequently Asked Questions
How do I convert Joules to Watt Hours?
Multiply your joules value by the conversion factor. To convert 500 kcal to joules: 500 × 4,184 = 2,092,000 J. You can also use the converter above for instant results.
What is J in Wh?
1 J equals 0.000278 Wh. This is based on the standard conversion factor: 1 kcal = 4,184 J.
Is this converter accurate?
Yes. ConvertFast uses precise conversion factors computed client-side in your browser. Results are accurate to 6 significant digits, which covers all practical use cases.