Watt-hours to BTU
Convert watt-hours to btu instantly. 1 Wh = 3.4121416331 BTU. Includes the exact factor, a conversion table of common values and the definition of both units.
How to convert watt-hours to btu
To convert watt-hours to btu, multiply by 3.4121416331. The relationship is fixed, so the same factor works for any quantity — there is nothing to look up and nothing that changes with temperature, location or context.
BTU = Wh × 3.4121416331
Watt-hours to BTU conversion table
The values people look up most often, rounded for reading. Use the calculator above for anything in between.
| Watt-hours | BTU |
|---|---|
| 1 Wh | 3.412142 BTU |
| 2 Wh | 6.824283 BTU |
| 3 Wh | 10.236425 BTU |
| 5 Wh | 17.060708 BTU |
| 10 Wh | 34.121416 BTU |
| 20 Wh | 68.242833 BTU |
| 25 Wh | 85.303541 BTU |
| 50 Wh | 170.607082 BTU |
| 100 Wh | 341.214163 BTU |
| 500 Wh | 1,706.07 BTU |
| 1,000 Wh | 3,412.14 BTU |
What is a watt-hour?
One watt sustained for one hour. Battery capacity is quoted this way.
What is a btu?
British thermal unit, used for heating and air-conditioning capacity.
The formula
BTU = Wh × 3.4121416331
Every result on this page comes from this formula. Nothing is rounded until the final display, so figures match a spreadsheet to the cent.
How to use the Watt-hours to BTU
- Type the number of watt-hours you want to convert.
- Read the result in btu straight away — there is no button to press.
- Check the table below for the values that come up most often, or reverse the conversion with the linked btu to watt-hours page.
Watt-hours to BTU — frequently asked questions
How many btu are in a watt-hour?
One watt-hour equals 3.4121416331 BTU. BTU = Wh × 3.4121416331
What is the formula to convert watt-hours to btu?
The formula is BTU = Wh × 3.4121416331. It is an exact definition rather than an approximation, so the conversion never drifts no matter how large the number.
How do I convert btu back to watt-hours?
Divide instead of multiplying: one btu is 0.2930710702 Wh. The reverse converter is linked in the related tools list.
Is this conversion exact?
Yes. Both units are defined against the same base unit by international agreement, so the factor is exact — any rounding you see is only in the display, which you can widen by entering more decimal places.
Is this watt-hours to btu free to use?
Yes. Every calculator on the site is free, needs no sign-up, and runs entirely in your browser, so your figures never leave your device.
What people search for
This page answers each of these searches. They are the exact phrases visitors use to find the watt-hours to btu.
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About this calculator
Written and reviewed by The Samsung Calculator editorial team. Every calculator is written against a published formula, reviewed against at least one independent reference implementation, and dated when it changes.
Last reviewed August 19, 2026 · Calculation runs client-side · No data collected · Report an error