Pound-feet to Pound-inches Calculator

Direct answer

Multiply the entered pound-feet value by 12 to express it in pound-inches (lbf·in). This converts pound-foot (lbf·ft) to pound-inch (lbf·in) within the documented torque family.

Variables and formula

• Pound-feet (lbf·ft): the source value measured in pound-foot.
• Pound-inches (lbf·in): the same quantity expressed in pound-inch.
• Conversion factor: 12 pound-inches per pound-foot.

Pound-inches = Pound-feet × 12

The generator emits numeric factors with at most 15 significant digits. Calculator results keep up to 10 significant digits for display; this formatting does not increase the precision of the measurement.

Unit definitions and named variants

Source unit: pound-foot (lbf·ft). This torque unit is one pound-force acting at a perpendicular distance of one international foot; the qualified unit is lbf·ft. Named variant used: Pound-force foot using the international foot; not pound mass foot or energy terminology. Reference: National Institute of Standards and Technology: NIST Guide to the SI, Appendix B.9: Factors for Units Listed by Kind of Quantity or Field of Science; National Institute of Standards and Technology: NIST Guide to the SI, Footnotes; National Institute of Standards and Technology: NIST Handbook 44 (2026), Appendix C: General Tables of Units of Measurement.

Target unit: pound-inch (lbf·in). This torque unit is one pound-force acting at a perpendicular distance of one international inch; the qualified unit is lbf·in. Named variant used: Pound-force inch using the international inch; not pound mass inch. Reference: National Institute of Standards and Technology: NIST Guide to the SI, Appendix B.9: Factors for Units Listed by Kind of Quantity or Field of Science; National Institute of Standards and Technology: NIST Guide to the SI, Footnotes; National Institute of Standards and Technology: NIST Handbook 44 (2026), Appendix C: General Tables of Units of Measurement.

The lbf·ft-to-lbf·in direction remains inside the torque quantity; it changes the unit label and numerical scale, not the kind of quantity being measured.

Relationship and precision

The named unit relationships are defined or exact, so the conversion is exact before display rounding and source-measurement uncertainty.

• lbf·ft relationship: The raw exact product is 4.4482216152605 N × 0.3048 m = 1.3558179483314003 N·m; the generator emits the route factor once at 15 significant digits.
• lbf·in relationship: The raw exact product is 4.4482216152605 N × 0.0254 m = 0.11298482902761668 N·m; the generator emits the route factor once at 15 significant digits.

To audit the factor through the family base unit, divide the raw dataset factors 1.3558179483314003 by 0.11298482902761668. The generator emits that quotient once at 15 significant digits as the canonical direct factor 12; runtime calculations do not divide the already-emitted base factors again.

Reproducible example

For 10 pound-feet, 10 × 12 = 120 pound-inches. Repeating the same multiplication with the stated factor reproduces the displayed conversion before interface rounding.

Directional scale check

Because one pound-foot contains 12 pound-inches, the target number is larger than the source number for every positive input. Zero maps to zero, while negative inputs are preserved as signed values under the stated direction convention.

Interpretation

Read the result as pound-inches, not pound-feet. A value entered as lbf·ft leaves the calculator labelled lbf·in; this directional distinction matters even when the two units describe the same torque quantity.

Assumptions and limitations

• A negative value denotes torque opposite the chosen positive rotational direction.
• The pound-foot and pound-inch slugs preserve established route names for pound-force foot and pound-force inch. The UI uses qualified symbols lbf·ft and lbf·in; lb·ft and lb·in remain ambiguous search aliases only.
• Kilogram-force metre uses standard gravity and is not a kilogram-metre mass product.

Common mistakes

• The UI uses the force-qualified symbol lbf·ft; lb·ft is retained only as an ambiguous search alias.
• There are exactly 12 lbf·in in 1 lbf·ft.

Continue within the Torque family

See the Torque conversion hub for its five-unit reference table and all 20 directed routes.

• Reverse the direction: Pound-inches to Pound-feet
• Compare another torque route: Pound-feet to Newton metres
• Compare another torque route: Pound-feet to Kilonewton metres
• Compare another torque route: Pound-feet to Kilogram-force metres
• Compare another torque route: Pound-inches to Newton metres

Assumptions

• The entered value uses pound-feet exactly as labelled.
• A negative value denotes torque opposite the chosen positive rotational direction.
• Rounding and measurement uncertainty remain the user's responsibility.

Sources and methodology

CalcMotive publishes the formula and assumptions so you can decide whether the estimate fits your use case. See our methodology standards.

• NIST Guide to the SI, Appendix B.9: Factors for Units Listed by Kind of Quantity or Field of Science; National Institute of Standards and Technology; accessed Aug 7, 2026
• NIST Guide to the SI, Footnotes; National Institute of Standards and Technology; accessed Aug 7, 2026
• NIST Handbook 44 (2026), Appendix C: General Tables of Units of Measurement; National Institute of Standards and Technology; accessed Aug 7, 2026