⚡ Energy
joules to Wh Converter
Convert joules to Wh instantly with a reference conversion table.
Quick answer: To convert joules to Wh, multiply by 0.000277778. For example, 1 joules = 0.000277778 Wh. Use the calculator below for any value.
joules to Wh
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Common conversions
| joules | Wh |
|---|
Formula:
How to convert joules to Wh
1
Enter your value
Type the number of joules you want to convert into the left box. The result in wh appears instantly in the right box. You can also type into the right box to convert in the other direction.
2
Use the swap button
Click the ⇄ Swap button to reverse the conversion — Wh to joules. Your current value carries across so you don't have to re-enter anything.
3
About joules and Wh
joules and Wh are common energy measurements.
📊 Common conversions at a glance
| joules | Wh |
|---|---|
| 1 | 0.0002778 |
| 3600 | 1 |
| 10000 | 2.778 |
| 100000 | 27.78 |
| 1000000 | 277.8 |
| 10000000 | 2778 |
Reviewed for 2026. joules ↔ Wh conversion factor verified against published reference data. Built by a UK-based qualified primary teacher and FA Level 2 coach as part of 247QuickTools' free utility-tools project.
Frequently asked questions
How do I convert joules to Wh?
To convert joules to Wh, multiply by 0.000277778. Or use the calculator above for instant results.
How many Wh are in 1 joules?
1 joules equals 0.000277778 Wh.
Is the joules to Wh converter free?
Yes, the joules to Wh converter is completely free with no sign-up required, no downloads, and it works offline once the page has loaded.