Watt-hours To Joules Conversion (Wh To J) - Inch Calculator

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• Watt-Hours to Joules Converter
• How to Convert Watt-Hours to Joules
• How Many Joules Are in a Watt-Hour?
• What Is a Watt-Hour?
• What Is a Joule?
• Watt-Hour to Joule Conversion Table
• References

Person Icon By Joe Sexton

Joe is the creator of Inch Calculator and has over 20 years of experience in engineering and construction. He holds several degrees and certifications.

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Sexton, J. (n.d.). Watt-Hours to Joules Converter. Inch Calculator. Retrieved March 11, 2026, from https://www.inchcalculator.com/convert/watt-hour-to-joule/

How to Convert Watt-Hours to Joules

To convert a measurement in watt-hours to a measurement in joules, multiply the energy by the following conversion ratio: 3,600 joules/watt-hour.

Since one watt-hour is equal to 3,600 joules, you can use this simple formula to convert:

joules = watt-hours × 3,600

The energy in joules is equal to the energy in watt-hours multiplied by 3,600.

For example, here's how to convert 5 watt-hours to joules using the formula above.

joules = (5 Wh × 3,600) = 18,000 J

How Many Joules Are in a Watt-Hour?

There are 3,600 joules in a watt-hour, which is why we use this value in the formula above.

1 Wh = 3,600 J

Watt-hours and joules are both units used to measure energy. Keep reading to learn more about each unit of measure.

What Is a Watt-Hour?

The watt-hour is a measure of electrical energy equal to one watt of power over a one hour period.

Watt-hours are usually abbreviated as Wh, although the formally adopted expression is W·h. The abbreviation W h is also sometimes used. For example, 1 watt-hour can be written as 1 Wh, 1 W·h, or 1 W h.

In formal expressions, the centered dot (·) or space is used to separate units used to indicate multiplication in an expression and to avoid conflicting prefixes being misinterpreted as a unit symbol.[1]

Learn more about watt-hours.

What Is a Joule?

The joule is the energy equal to the force on an object of one newton at a distance of one meter.[1] One joule is equal to the heat energy dissipated by the current of one ampere through one ohm of resistance for one second.

One joule is also equal to the energy needed to move an electric charge of one coulomb through a potential difference of one volt. In addition, one joule is also equal to the one watt-second.

The joule is the SI derived unit for energy in the metric system. Joules can be abbreviated as J; for example, 1 joule can be written as 1 J.

Learn more about joules.

Watt-Hour to Joule Conversion Table

Table showing various watt-hour measurements converted to joules.

Watt-hours	Joules
0.001 Wh	3.6 J
0.002 Wh	7.2 J
0.003 Wh	10.8 J
0.004 Wh	14.4 J
0.005 Wh	18 J
0.006 Wh	21.6 J
0.007 Wh	25.2 J
0.008 Wh	28.8 J
0.009 Wh	32.4 J
0.01 Wh	36 J
0.02 Wh	72 J
0.03 Wh	108 J
0.04 Wh	144 J
0.05 Wh	180 J
0.06 Wh	216 J
0.07 Wh	252 J
0.08 Wh	288 J
0.09 Wh	324 J
0.1 Wh	360 J
0.2 Wh	720 J
0.3 Wh	1,080 J
0.4 Wh	1,440 J
0.5 Wh	1,800 J
0.6 Wh	2,160 J
0.7 Wh	2,520 J
0.8 Wh	2,880 J
0.9 Wh	3,240 J
1 Wh	3,600 J

References

1. Bureau International des Poids et Mesures, The International System of Units (SI), 9th edition, 2019, https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf

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