wh to joules | Exact Decimal + Formula

1 Watt-hour = 3600 Joule

One watt-hour equals exactly 3,600 joules — a fixed ratio you can memorize. Real-world use: battery capacities and small appliance energy consumption. This page expresses those values in joules, which is used for physics and engineering energy calculations. Type a value above for an instant answer; the exact formula and the reference table are below.

About Watt-hour and Joule

Watt-hour (Wh)

A watt-hour is one watt of power sustained for one hour, equal to 3,600 joules.

Where it's used: Battery capacities and small appliance energy consumption.

Joule (J)

The joule is the SI unit of energy — the work done by one newton over one meter.

Where it's used: Physics and engineering energy calculations.

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Precision

Formula

J = Wh × 3600

To convert Watt-hour to Joule, use the formula displayed above.

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Watt-hour to Joule: Quick Reference Table

Watt-hour	Joule (Decimal)	Fraction	Real-world equivalent
0.001 Wh	3.6 J	-	standard single unit scale
0.01 Wh	36 J	-	multiple unit increments
0.1 Wh	360 J	-	multiple unit increments
0.5 Wh	1800 J	-	multiple unit increments
1 Wh	3600 J	-	multiple unit increments
2 Wh	7200 J	-	multiple unit increments
5 Wh	18000 J	-	multiple unit increments
10 Wh	36000 J	-	multiple unit increments
25 Wh	90000 J	-	multiple unit increments
50 Wh	180000 J	-	multiple unit increments
100 Wh	360000 J	-	multiple unit increments
250 Wh	900000 J	-	multiple unit increments
500 Wh	1800000 J	-	multiple unit increments
1000 Wh	3600000 J	-	multiple unit increments

Wh to J Formula and Examples

Direct Formula J = Wh × 3600

Inverse Formula Wh = J × 0.000278

Mental Math Shortcut

Multiply the value by roughly 3600 to calculate the equivalent amount in your head.

Common Watt-hour to Joule Calculations

5 Wh = 18000 J
10 Wh = 36000 J
50 Wh = 180000 J
100 Wh = 360000 J
500 Wh = 1800000 J

Precision & Practical Use

For example, 10 Wh = 36000 J — roughly multiple unit increments.

Utility bills and appliance ratings are given in whole kWh or BTU. Round converted figures to match the source document you're comparing against.

How to Convert Watt-hour to Joule

How many joules are in one watt-hour?

One Watt-hour (Wh) equals 3600 Joule (J). To convert watt-hours to joules, multiply the watt-hour value by 3600.

How do I convert Watt-hour to Joule?

Multiply your watt-hour value by 3600 to get the result in Joule: J = Wh × 3600. For example, 5 Wh = 18000 J.

What is the formula for converting Wh to J?

The conversion formula is J = Wh × 3600. Use the calculator above for any value, and see the reference table below for common inputs from 0.001 to 1000.

Is there a quick mental estimate for Wh to J?