Foot-pound to Pound-foot
Compare Foot-pound and Pound-foot. See why these engineering units measure different physical quantities, plus links to valid conversions.
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Engineering Converter
Convert common stress, force, torque, power, and energy units used in engineering.
Context values
Some unit families need one extra value for a physically accurate result.
Use the converter to see the formula.
Foot-pound and Pound-foot measure different quantities, so no single result applies.
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Formula
Foot-pound (ft-lb) measures energy, while Pound-foot (lb ft) measures torque (rotational force). These are different physical quantities, so there is no single multiplication factor that converts one into the other.
ft-lb relates to its own energy base unit by a factor of 1.35582. lb ft relates to its own torque (rotational force) base unit by a factor of 1.35582.
Conversion table
| Foot-pound (ft-lb) | 1.35582 × energy base unit |
| Pound-foot (lb ft) | 1.35582 × torque (rotational force) base unit |
Related conversions
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Frequently asked questions
Can Foot-pound be converted to Pound-foot?
Not directly. Foot-pound measures energy and Pound-foot measures torque (rotational force). Converting between different physical quantities needs an extra physical relationship (such as area, distance, or time), not just a unit ratio.
What is Foot-pound used for?
The Foot-pound (ft-lb) is a unit of energy. Work from one pound-force over one foot.
What is Pound-foot used for?
The Pound-foot (lb ft) is a unit of torque (rotational force). Torque from one pound-force at one foot.
Why does the converter show an incompatible units message?
The Universal Converter only calculates a numeric result when both units share the same physical dimension. Since Foot-pound and Pound-foot don't, the tool flags them as not directly compatible rather than returning a meaningless number.
What should I convert Foot-pound to instead?
Use another energy unit, such as one of the related Foot-pound conversions linked below.
What should I convert Pound-foot to instead?
Use another torque (rotational force) unit, such as one of the related Pound-foot conversions linked below.
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About this conversion
This page compares Foot-pound (ft-lb) and Pound-foot (lb ft) within the engineering converter.
Work from one pound-force over one foot. Torque from one pound-force at one foot.
Because Foot-pound measures energy and Pound-foot measures torque (rotational force), the two units are not directly convertible: there is no fixed ratio that turns one into the other without additional information.
The calculator above will report that these units are not compatible. For a working result, choose two units from the same measurement family — see the related conversions below.