Inch Pounds to Foot Pounds Calculator - Torque Conversion

An inch pounds to foot pounds calculator converts a torque written in inch-pounds (in·lbf) into a torque in foot-pounds (ft·lbf) using the exact 1/12 inch-per-foot relationship, and it also runs the reverse direction so a foot-pound spec can be read as an inch-pound value for a 1/4 in or 3/8 in drive torque wrench.

• • Torque wrench conversions: A 60 in-lb click-style wrench setting is checked against a service-manual ft-lb spec without manual division.
• • Bicycle, motorcycle, and furniture assembly: Bolt torque values printed in ft-lb on a US spec are read in in-lb for an in-lb scale torque wrench, and the reverse direction is used for European service manuals.
• • Reverse direction for spec sheets: A torque in ft-lb from a CAD or service file is read in in-lb for an imperial wrench or shop practice.
• • Cross-check N·m, kgf·m, and kgf·cm: The same torque value is shown in newton-meters, kilogram-force metres, and kilogram-force centimetres so the same number can be checked against any of the four common torque scales.

Inch-pound and foot-pound both measure torque, which is force applied at a distance. The conversion is exact because the two units share the same pound-force and only differ in the lever arm: 1 foot is exactly 12 inches, so 1 ft·lbf is exactly 12 in·lbf.

For a wider torque conversion that covers N·m, kgf·m, and dyn·cm alongside in-lb and ft-lb, Torque Converter runs the same factor table over a broader torque family.

The conversion runs through a single exact relationship. The core formula is ft·lbf = in·lbf / 12. The reverse direction is in·lbf = ft·lbf x 12.

• in·lbf: Torque in inch-pounds; the imperial unit printed on most US-spec 1/4 in and 3/8 in drive torque wrenches.
• ft·lbf: Torque in foot-pounds; the imperial unit printed on most 3/8 in and 1/2 in drive torque wrenches and US service manuals.
• Factor 12: Exact factor from 1 foot = 12 inches (NIST). The factor carries no rounding because the inch and the foot are defined exactly.

Both directions are exposed so the last-edited input is the source of truth. The cross outputs in N·m, kgf·m, and kgf·cm use the same torque value, so a single entry feeds every output in the result panel.

According to NIST Special Publication 811, one foot is defined as exactly 12 inches, which is the exact lever-arm ratio between a foot-pound and an inch-pound of torque.

For a torque workflow that goes from inch-pounds to newton-meters using the exact NIST factor, Inch Lbs to Nm Calculator applies the same inch-pound base on the SI side of the family.

The main ideas behind an inch pounds to foot pounds calculator are torque as a force-times-distance product, the 12-inch foot, the role of the pound-force definition, and the cross-check with metric torque units.

The in-lb <-> ft-lb factor is exact, which means a torque spec on a wrench or a service sheet can be copied across unit systems without rounding error. Display rounding is controlled by the precision selector, but the math behind it is the full 12 in/ft relationship.

For a length-only conversion that explains the same 12-inch foot, Feet to Inches Calculator runs the same exact relationship on the linear side of the family.

The calculator is built so that the inch-pound side, the foot-pound side, and the cross outputs are all visible at the same time, and the last edited torque field decides which side updates.

1. 1 Pick a side and enter the torque: Type a torque in in-lb to read ft-lb, or type a torque in ft-lb to read in-lb. The other side updates as you type, and the N-m, kgf-m, and kgf-cm rows follow the same torque value.
2. 2 Adjust the decimal places: Use the precision selector to match the rounding in the surrounding record: zero for a fast shop estimate, three for a service-manual spec, six for a high-precision spec sheet.
3. 3 Read the cross outputs: Use N-m for a European service manual, kgf-m for an older Asian spec sheet, and kgf-cm for a metric fastener card. The same torque value is shown in every unit.
4. 4 Cross-check a value before applying it: If a service manual lists a torque in ft-lb, type it into the ft-lb field and read the in-lb result. The wrench is then set to the in-lb value, and the cross outputs verify the same torque.
5. 5 Reset before the next entry: Use Reset to clear the ft-lb field and return the in-lb field to 24 in-lb, so the next conversion starts from a known default.

A bicycle stem is tightened to a 5 ft-lb spec on the US manual. Type 0 into the in-lb field and 5 into the ft-lb field, and the calculator returns 60 in-lb. Set a 3/8 in drive torque wrench to 60 in-lb, and the cross output shows about 6.78 N-m and 81.34 kgf-cm for a quick cross-check against a metric wrench if one is on hand.

For a wider SI torque workflow that starts from newton-meters and reads other metric torque units, Newton Meter Calculator applies the same SI definitions on the newton-meter side of the family.

The benefit of a focused inch pounds to foot pounds calculator is that the factor is exact, the cross outputs cover the four common torque scales, and the result is auditable against the service-manual spec.

• • Exact 1/12 factor: The in-lb <-> ft-lb conversion uses 1 foot = 12 inches (NIST), which is exact. No rounding is hidden in the math, and a 24 in-lb input always reads as 2 ft-lb.
• • Bidirectional in one place: Type in-lb to read ft-lb, or type ft-lb to read in-lb, without re-entering values or switching modes. The same exact factor is used in both directions.
• • Five-unit cross output: N-m, kgf-m, and kgf-cm are shown alongside the in-lb and ft-lb results, so the same torque can be checked against any common service-manual scale.
• • Decimal precision selector: Choose zero for a fast shop estimate, three for a service-manual spec, or six for a high-precision CAD or calibration record.
• • Auditable factor display: The active factor and unit math are shown in the result panel, so a torque spec on a wrench or a manual can be checked against the source instead of trusted as an unexplained number.
• • Useful in bicycle, auto, and small-engine work: A 5 ft-lb bicycle stem, a 60 in-lb automotive accessory bolt, and a 12 in-lb electronics spec can all be entered directly without manual unit conversion.

The page is also useful during transcription. A torque value copied from a service manual, spec sheet, or CAD file can be checked in the calculator before it is entered into a work order or a wrench setting.

For an engine performance workflow that takes a torque value into horsepower, Torque to Horsepower Calculator multiplies the same torque reading by an RPM value to land at mechanical horsepower.

The conversion itself is a single division, but the way the result is used depends on the spec, the wrench, and the working conditions.

• • The calculator only reports the torque implied by the entered inch-pound or foot-pound value. It does not pick a torque for a particular fastener, override a printed spec, or estimate behaviour at extreme temperature or under repeated cycles.
• • Reference factors are exact by definition, but a service-manual spec is still only as accurate as the wrench used to apply it. A calibrated wrench should be used for safety-critical fasteners.

The most common mistake in an in-lb <-> ft-lb workflow is to confuse in-lb with ft-lb. A 60 in-lb reading is 5 ft-lb, not 60 ft-lb. The calculator shows both, and the right scale depends on the wrench and the manual.

According to BIPM SI Brochure, the newton-meter is the coherent SI derived unit of torque, and the calculator uses it as the SI cross-check on the in-lb <-> ft-lb conversion.

For a wider torque family that includes dyn-cm, kgf-m, and ozf-ft alongside the units on this page, Torque Converter runs the same factor table over the full torque unit set.