Quick Answer
1 joule equals 0.000277778 watt-hours. To convert joules to watt-hours, multiply the value by this factor.
Key Facts
- Reverse: 1 watt-hour = 3,600 joules.
Joules to Watt-hours Converter
Free instant J → Wh converter. No signup, no uploads — everything is calculated privately in your browser.
1 J = 0.000277778 watt-hours
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Joules to Watt-hours Formula
Formula: value ÷ 3,600
Prefer to skip the math? Type any value in the converter above and it converts instantly.
Joules to Watt-hours Conversion Table
| Joules (J) | Watt-hours (Wh) |
|---|---|
| 1 J | 0.000277778 Wh |
| 2 J | 0.000555556 Wh |
| 5 J | 0.00138889 Wh |
| 10 J | 0.00277778 Wh |
| 25 J | 0.00694444 Wh |
| 50 J | 0.0138889 Wh |
| 100 J | 0.0277778 Wh |
| 250 J | 0.0694444 Wh |
| 500 J | 0.138889 Wh |
| 1,000 J | 0.277778 Wh |
Frequently Asked Questions
How do I convert joules to watt-hours?
Enter the value above and the result appears instantly — the calculation runs entirely in your browser. Formula: value ÷ 3,600.
What is the exact joules to watt-hours conversion factor?
1 joule = 0.000277778 watt-hours (shown to 6 significant figures — the converter itself computes at full precision). The reverse factor is 1 watt-hour = 3,600 joules.
What are some common joules to watt-hours conversions?
1 J = 0.000277778 Wh; 10 J = 0.00277778 Wh; 100 J = 0.0277778 Wh. Use the full conversion table below for more reference values.
Is a calorie the same as a food Calorie?
No — and the capital letter matters. A food Calorie (with a capital C) is a kilocalorie: 1,000 small calories. This converter treats them correctly: 1 kcal = 4.184 kJ = 1,000 cal. Energy labels on food almost always mean kilocalories, even where the label just says "calories".
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