A foot-pound (ft-lb) is the work done by one pound-force acting through a distance of one foot, commonly used in mechanical and engineering calculations.
Foot-pounds to Btu
Convert Foot-pound (ft-lb) to British thermal unit (BTU) instantly with an exact formula, conversion table, and FAQ.
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Convert foot-pounds (ft-lb) 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 = ft-lb × 0.001285067463
Results update instantly for Foot-pounds to Btu conversions.
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Formula
BTU = ft-lb × 0.001285067463
ft-lb = BTU × 778.1692623
Conversion table
| 1 ft-lb | 0.001285 BTU |
| 5 ft-lb | 0.006425 BTU |
| 10 ft-lb | 0.012851 BTU |
| 20 ft-lb | 0.025701 BTU |
| 50 ft-lb | 0.064253 BTU |
| 100 ft-lb | 0.128507 BTU |
| 500 ft-lb | 0.642534 BTU |
| 1000 ft-lb | 1.285067 BTU |
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How the formula works
Both foot-pound and british thermal unit measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in foot-pounds by 0.001285067463 to get btu. To reverse the conversion, multiply a british thermal unit value by 778.1692623 to get back to foot-pounds.
Frequently asked questions
What is Foot-pound (ft-lb)?
A foot-pound (ft-lb) is the work done by one pound-force acting through a distance of one foot, commonly used in mechanical and engineering calculations.
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 foot-pounds to btu?
Multiply the foot-pound value by 0.001285067463 to get the equivalent in btu. For example, 5 ft-lb × 0.001285067463 = 0.006425 BTU.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 0.001285067463 is an exact, non-rounded value.
Can I convert btu back to foot-pounds?
Yes. Divide the british thermal unit value by 0.001285067463, or multiply it by 778.1692623, to get foot-pounds.
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About converting foot-pounds to btu
A foot-pound (ft-lb) is the work done by one pound-force acting through a distance of one foot, commonly used in mechanical and engineering calculations. 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 foot-pounds 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.