Pound-inch to Pound-force
Compare Pound-inch and Pound-force. 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.
Pound-inch and Pound-force measure different quantities, so no single result applies.
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Formula
Pound-inch (lb in) measures torque (rotational force), while Pound-force (lbf) measures force. These are different physical quantities, so there is no single multiplication factor that converts one into the other.
lb in relates to its own torque (rotational force) base unit by a factor of 0.112985. lbf relates to its own force base unit by a factor of 4.44822.
Conversion table
| Pound-inch (lb in) | 0.112985 × torque (rotational force) base unit |
| Pound-force (lbf) | 4.44822 × force base unit |
Related conversions
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Frequently asked questions
Can Pound-inch be converted to Pound-force?
Not directly. Pound-inch measures torque (rotational force) and Pound-force measures force. Converting between different physical quantities needs an extra physical relationship (such as area, distance, or time), not just a unit ratio.
What is Pound-inch used for?
The Pound-inch (lb in) is a unit of torque (rotational force). Torque from one pound-force at one inch.
What is Pound-force used for?
The Pound-force (lbf) is a unit of force. Pound-force under standard gravity.
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 Pound-inch and Pound-force don't, the tool flags them as not directly compatible rather than returning a meaningless number.
What should I convert Pound-inch to instead?
Use another torque (rotational force) unit, such as one of the related Pound-inch conversions linked below.
What should I convert Pound-force to instead?
Use another force unit, such as one of the related Pound-force conversions linked below.
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About this conversion
This page compares Pound-inch (lb in) and Pound-force (lbf) within the engineering converter.
Torque from one pound-force at one inch. Pound-force under standard gravity.
Because Pound-inch measures torque (rotational force) and Pound-force measures 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.