Quick answer: 1 Watt-hour (Wh) in Joule
1 Wh equals 3600 J. To convert Watt-hour (Wh) to Joule, multiply by 3600 using the free calculator above — no signup needed.
Energy & Work units
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About Energy & Work Converter
The Energy & Work Converter converts between 7 different units, including Joule, Kilojoule, Calorie, Kilocalorie (kcal), Watt-hour (Wh). The base unit is the Joule, and every other unit on this page is defined as an exact multiple of it. Type any value into the calculator above to convert instantly — free, unlimited, no signup and nothing to install.
Common equivalents: 1 Joule = 0.001 Kilojoule, 0.239006 Calorie, 0.000239006 Kilocalorie (kcal).
Scale of this category: the smallest unit is the Joule (J) and the largest is the Kilowatt-hour (kWh) (kWh).
Last updated: 2026-09-15
Energy & Work conversion factors
| Unit | Symbol | Value in Joule |
|---|---|---|
| Joule | J | 1 J = 1 J |
| Kilojoule | kJ | 1 kJ = 1000 J |
| Calorie | cal | 1 cal = 4.184 J |
| Kilocalorie (kcal) | kcal | 1 kcal = 4184 J |
| Watt-hour (Wh) | Wh | 1 Wh = 3600 J |
| Kilowatt-hour (kWh) | kWh | 1 kWh = 3600000 J |
| BTU | BTU | 1 BTU = 1055.06 J |
Worked Examples
See exactly how the conversion works with real numbers, step by step.
How much is 1 Watt-hour (Wh) in Joule?
- Multiply 1 by the conversion factor 3600
- 1 Watt-hour (Wh) = 3600 Joule
How much is 5 Watt-hour (Wh) in Joule?
- Multiply 5 by the conversion factor 3600
- 5 Watt-hour (Wh) = 18000 Joule
How much is 25 Watt-hour (Wh) in Joule?
- Multiply 25 by the conversion factor 3600
- 25 Watt-hour (Wh) = 90000 Joule
Quick Conversion Reference Table
| Watt-hour (Wh) (Wh) | Joule (J) |
|---|---|
| 1 Wh (Watt-hour (Wh)) | 3600 J (Joule) |
| 2 Wh (Watt-hour (Wh)) | 7200 J (Joule) |
| 5 Wh (Watt-hour (Wh)) | 18000 J (Joule) |
| 10 Wh (Watt-hour (Wh)) | 36000 J (Joule) |
| 20 Wh (Watt-hour (Wh)) | 72000 J (Joule) |
| 50 Wh (Watt-hour (Wh)) | 180000 J (Joule) |
| 100 Wh (Watt-hour (Wh)) | 360000 J (Joule) |
| 500 Wh (Watt-hour (Wh)) | 1800000 J (Joule) |
| 1000 Wh (Watt-hour (Wh)) | 3600000 J (Joule) |
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How to Use This Converter
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FAQ
How much is 1 Watt-hour (Wh) in Joule?
1 Watt-hour (Wh) = 3600 Joule.
How do I convert Watt-hour (Wh) to Joule?
Enter your value in Watt-hour (Wh) into the converter above and the result in Joule appears instantly. 1 Wh equals 3600 J — just multiply your value by 3600.
What is the formula for Watt-hour (Wh) to Joule?
The formula is: value in Joule = value in Watt-hour (Wh) × 3600. For example, 5 Wh × 3600 = 18000 J.
Is this Watt-hour (Wh) to Joule converter free and accurate?
Yes. This Watt-hour (Wh) to Joule converter is 100% free, uses the exact international conversion factor (3600), and works on any device with no signup.
How do I convert Joule back to Watt-hour (Wh)?
To convert back, divide by 3600 (or multiply by 0.000277778). You can also use our dedicated How Many Watt-hour (Wh) in 1 Joule? page for instant results.
Do I need to download an app or sign up?
No. The converter runs entirely in your browser — nothing to install, no account, no fees. It even keeps working offline once the page has loaded.
Which Energy & Work units are supported?
This converter supports 7 units: Joule, Kilojoule, Calorie, Kilocalorie (kcal), Watt-hour (Wh), Kilowatt-hour (kWh), BTU.