A watt-hour (Wh) is the energy delivered by one watt of power sustained for one hour, equal to 3,600 joules.
Watt hours to Btu
Convert Watt-hour (Wh) to British thermal unit (BTU) instantly with an exact formula, conversion table, and FAQ.
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Convert watt hours (Wh) to btu (BTU) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
The British thermal unit (BTU) is the energy needed to raise one pound of water by one degree Fahrenheit, widely used for heating and air-conditioning ratings.
BTU = Wh × 3.412141633
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Formula
BTU = Wh × 3.412141633
Wh = BTU × 0.2930710702
Conversion table
| 1 Wh | 3.412142 BTU |
| 5 Wh | 17.060708 BTU |
| 10 Wh | 34.121416 BTU |
| 20 Wh | 68.242833 BTU |
| 50 Wh | 170.607082 BTU |
| 100 Wh | 341.214163 BTU |
| 500 Wh | 1706.070817 BTU |
| 1000 Wh | 3412.141633 BTU |
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How the formula works
Both watt-hour and british thermal unit measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in watt hours by 3.412141633 to get btu. To reverse the conversion, multiply a british thermal unit value by 0.2930710702 to get back to watt hours.
Frequently asked questions
What is Watt-hour (Wh)?
A watt-hour (Wh) is the energy delivered by one watt of power sustained for one hour, equal to 3,600 joules.
What is British thermal unit (BTU)?
The British thermal unit (BTU) is the energy needed to raise one pound of water by one degree Fahrenheit, widely used for heating and air-conditioning ratings.
How do I convert watt hours to btu?
Multiply the watt-hour value by 3.412141633 to get the equivalent in btu. For example, 5 Wh × 3.412141633 = 17.060708 BTU.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 3.412141633 is an exact, non-rounded value.
Can I convert btu back to watt hours?
Yes. Divide the british thermal unit value by 3.412141633, or multiply it by 0.2930710702, to get watt hours.
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About converting watt hours to btu
A watt-hour (Wh) is the energy delivered by one watt of power sustained for one hour, equal to 3,600 joules. The British thermal unit (BTU) is the energy needed to raise one pound of water by one degree Fahrenheit, widely used for heating and air-conditioning ratings.
Use this calculator to move between watt hours and btu accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.