/convert/watt-hours-to-joules/ Convert watt-hours (Wh) to joules instantly. Includes a reference table and formula. article watt-hours (Wh) to joules Converter — 247QuickTools ,{ "@context": "https://schema.org", "@type": "SpeakableSpecification", "cssSelector": [".tool-intro", ".info-gain-section"] }
⚡ Energy

watt-hours (Wh) to joules Converter

Convert watt-hours (Wh) to joules instantly. Includes a reference table and formula.

Quick answer: To convert watt-hours (Wh) to joules, multiply by 3600. For example, 1 watt-hours (Wh) = 3600 joules. Use the calculator below for any value.
watt-hours (Wh) to joules
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Common conversions
watt-hours (Wh) joules
Formula:

How to convert watt-hours (Wh) to joules

1

Enter your value

Type the number of watt-hours (wh) you want to convert into the left box. The result in joules 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 — joules to watt-hours (Wh). Your current value carries across so you don't have to re-enter anything.

3

About watt-hours (Wh) and joules

watt-hours (Wh) and joules are measurement units. Use this converter to switch between them instantly.

💡 Did you know?

1 Wh = 3,600 J. A phone battery (4,500 mAh at 3.7V) = 16.65 Wh = 59,940 J. One hour of LED lighting (9W) = 9 Wh = 32,400 J. The Wh to J conversion shows why energy storage is so hard: even a large battery contains relatively modest joule quantities compared to chemical fuels.

📊 Common conversions at a glance
watt-hours (Wh) joules
0.1 360
0.5 1800
1 3600
5 1.8e+04
10 3.6e+04
20 7.2e+04
Reviewed for 2026. watt-hours (Wh) ↔ joules 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.