Foot-pounds to BTU
Convert foot-pounds to btu instantly. 1 ft·lb = 0.0012850675 BTU. Includes the exact factor, a conversion table of common values and the definition of both units.
How to convert foot-pounds to btu
To convert foot-pounds to btu, divide by 778.169262266 (multiply by 0.0012850675). 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 = ft·lb × 0.0012850675
Foot-pounds to BTU conversion table
The values people look up most often, rounded for reading. Use the calculator above for anything in between.
| Foot-pounds | BTU |
|---|---|
| 1 ft·lb | 0.001285 BTU |
| 2 ft·lb | 0.00257 BTU |
| 3 ft·lb | 0.003855 BTU |
| 5 ft·lb | 0.006425 BTU |
| 10 ft·lb | 0.012851 BTU |
| 20 ft·lb | 0.025701 BTU |
| 25 ft·lb | 0.032127 BTU |
| 50 ft·lb | 0.064253 BTU |
| 100 ft·lb | 0.128507 BTU |
| 500 ft·lb | 0.642534 BTU |
| 1,000 ft·lb | 1.285067 BTU |
What is a foot-pound?
The energy of one pound-force acting through one foot.
What is a btu?
British thermal unit, used for heating and air-conditioning capacity.
The formula
BTU = ft·lb × 0.0012850675
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 Foot-pounds to BTU
- Type the number of foot-pounds 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 foot-pounds page.
Foot-pounds to BTU — frequently asked questions
How many btu are in a foot-pound?
One foot-pound equals 0.0012850675 BTU. BTU = ft·lb × 0.0012850675
What is the formula to convert foot-pounds to btu?
The formula is BTU = ft·lb × 0.0012850675. 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 foot-pounds?
Divide instead of multiplying: one btu is 778.169262266 ft·lb. 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 foot-pounds 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
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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