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 Joules
Convert Foot-pound (ft-lb) to Joule (J) instantly with an exact formula, conversion table, and FAQ.
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Convert foot-pounds (ft-lb) to joules (J) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
The joule (J) is the SI derived unit of energy, equal to the work done when a force of one newton acts over one meter.
J = ft-lb × 1.355817948
Results update instantly for Foot-pounds to Joules conversions.
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Formula
J = ft-lb × 1.355817948
ft-lb = J × 0.7375621493
Conversion table
| 1 ft-lb | 1.355818 J |
| 5 ft-lb | 6.779090 J |
| 10 ft-lb | 13.558179 J |
| 20 ft-lb | 27.116359 J |
| 50 ft-lb | 67.790897 J |
| 100 ft-lb | 135.581795 J |
| 500 ft-lb | 677.908974 J |
| 1000 ft-lb | 1355.817948 J |
Related conversions
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How the formula works
Both foot-pound and joule measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in foot-pounds by 1.355817948 to get joules. To reverse the conversion, multiply a joule value by 0.7375621493 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 Joule (J)?
The joule (J) is the SI derived unit of energy, equal to the work done when a force of one newton acts over one meter.
How do I convert foot-pounds to joules?
Multiply the foot-pound value by 1.355817948 to get the equivalent in joules. For example, 5 ft-lb × 1.355817948 = 6.779090 J.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 1.355817948 is an exact, non-rounded value.
Can I convert joules back to foot-pounds?
Yes. Divide the joule value by 1.355817948, or multiply it by 0.7375621493, to get foot-pounds.
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About converting foot-pounds to joules
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 joule (J) is the SI derived unit of energy, equal to the work done when a force of one newton acts over one meter.
Use this calculator to move between foot-pounds and joules accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.