Watt to Watt-hour
Compare Watt and Watt-hour. See why these engineering units measure different physical quantities, plus links to valid conversions.
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Engineering Converter
Convert common stress, force, torque, power, and energy units used in engineering.
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Some unit families need one extra value for a physically accurate result.
Use the converter to see the formula.
Watt and Watt-hour measure different quantities, so no single result applies.
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Formula
Watt (W) measures power, while Watt-hour (Wh) measures energy. These are different physical quantities, so there is no single multiplication factor that converts one into the other.
W relates to its own power base unit by a factor of 1. Wh relates to its own energy base unit by a factor of 3600.
Conversion table
| Watt (W) | 1 × power base unit |
| Watt-hour (Wh) | 3600 × energy base unit |
Related conversions
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Frequently asked questions
Can Watt be converted to Watt-hour?
Not directly. Watt measures power and Watt-hour measures energy. Converting between different physical quantities needs an extra physical relationship (such as area, distance, or time), not just a unit ratio.
What is Watt used for?
The Watt (W) is a unit of power. The watt is one joule per second.
What is Watt-hour used for?
The Watt-hour (Wh) is a unit of energy. A watt-hour is 3,600 joules.
Why does the converter show an incompatible units message?
The Universal Converter only calculates a numeric result when both units share the same physical dimension. Since Watt and Watt-hour don't, the tool flags them as not directly compatible rather than returning a meaningless number.
What should I convert Watt to instead?
Use another power unit, such as one of the related Watt conversions linked below.
What should I convert Watt-hour to instead?
Use another energy unit, such as one of the related Watt-hour conversions linked below.
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About this conversion
This page compares Watt (W) and Watt-hour (Wh) within the engineering converter.
The watt is one joule per second. A watt-hour is 3,600 joules.
Because Watt measures power and Watt-hour measures energy, the two units are not directly convertible: there is no fixed ratio that turns one into the other without additional information.
The calculator above will report that these units are not compatible. For a working result, choose two units from the same measurement family — see the related conversions below.