Convert Pound-force Inches to Pound-force Feet
Pound-force Inch (lbf·in) to Pound-force Foot (lbf·ft) unit conversion — enter any value below to get an instant result, or use the table for common values.
Results from this calculator are estimates provided for general informational purposes only, based on formulas, rates, and standards commonly accepted as of 2026. Figures may differ slightly from other calculators or professional sources due to rounding methods, differing assumptions, or regional regulations, and rules may change over time. Always consult a qualified professional — such as a financial advisor, healthcare provider, or other relevant specialist — before making decisions based on these results.
Result
1 lbf·in = 0.083333333 lbf·ft
1 Pound-force Inch = 0.083333333 Pound-force Feet
1 Pound-force Foot = 12 Pound-force Inches
1 lbf·in in every supported unit
Conversion chart: Pound-force Inch to Pound-force Feet
Conversion table
| Pound-force Inch (lbf·in) | Pound-force Foot (lbf·ft) |
|---|---|
| 0.01 lbf·in | 0.00083333333 lbf·ft |
| 0.1 lbf·in | 0.0083333333 lbf·ft |
| 1 lbf·in | 0.083333333 lbf·ft |
| 2 lbf·in | 0.16666667 lbf·ft |
| 3 lbf·in | 0.25 lbf·ft |
| 5 lbf·in | 0.41666667 lbf·ft |
| 10 lbf·in | 0.83333333 lbf·ft |
| 20 lbf·in | 1.6666667 lbf·ft |
| 50 lbf·in | 4.1666667 lbf·ft |
| 100 lbf·in | 8.3333333 lbf·ft |
| 1000 lbf·in | 83.333333 lbf·ft |
Pound-force Inch (lbf·in)
Definition: A finer US customary structural moment unit equal to the turning effect of a 1-pound-force applied 1 inch from the pivot, used when foot-scale units are too coarse.
History: Derived from pound-force foot via the standard 12-inches-per-foot relationship, applied to smaller structural connections, fasteners, and component-level bending analysis.
Current use: Used in the design of bolted connections, brackets, and smaller structural components where inch-scale precision is more appropriate than foot-scale moments.
Pound-force Foot (lbf·ft)
Definition: The US customary structural moment unit, equal to the turning effect of a 1-pound-force applied 1 foot from the pivot — the standard bending moment unit in American structural engineering.
History: Built from the pound-force and foot units codified in the English Engineering System, used throughout US building codes and structural design manuals since the 19th and 20th centuries.
Current use: The standard unit for beam and column bending moments, connection design moments, and structural capacity ratings in American building codes such as the AISC steel and ACI concrete design manuals.
Supported Units
| Unit | Symbol | In Newton Meters |
|---|---|---|
| Newton Meter | N·m | 1 N·m |
| Newton Centimeter | N·cm | 0.01 N·m |
| Newton Millimeter | N·mm | 0.001 N·m |
| Kilonewton Meter | kN·m | 1000 N·m |
| Kilogram-force Meter | kgf·m | 9.80665 N·m |
| Kilogram-force Centimeter | kgf·cm | 0.0980665 N·m |
| Pound-force Foot | lbf·ft | 1.3558179 N·m |
| Pound-force Inch | lbf·in | 0.11298483 N·m |
| Ounce-force Inch | ozf·in | 0.0070615518 N·m |
| Dyne Centimeter | dyn·cm | 1E-07 N·m |
About These Parameters
- Value
- The number you want to convert, expressed in the "From" unit. Accepts decimals.
- From Unit
- The moment of force unit your input value is currently measured in.
- To Unit
- The moment of force unit you want the result converted into. Use the swap button to flip From and To instantly.
How Moment of Force Conversion Works
The Formula
Every unit here is defined by a fixed multiplier relative to the newton meter. To convert a value from one unit to another:
result = value × (factor of "From" unit ÷ factor of "To" unit)
For Pound-force Inch → Pound-force Foot: multiply by 0.083333333. For example, 1 lbf·in × 0.083333333 = 0.083333333 lbf·ft.
Bending Moments in Beams and Structures
When a load is applied to a beam, it doesn't just push straight down — it creates an internal bending moment that varies along the beam's length, largest typically at mid-span or at a fixed support. Structural engineers calculate this moment (force × lever-arm distance) at every critical section and compare it against the beam or connection's moment capacity, which depends on the material's strength and the cross-section's geometry. Getting this comparison right is the central task of beam and frame design: too little capacity and the member yields or fractures; too much and the design wastes material and cost.
Moment vs. Torque: Same Physics, Different Context
Moment of force and torque share the exact same units and the same underlying formula (force × distance), but engineering convention reserves "moment" for bending and rotational-equilibrium problems in stationary structures — beams, columns, connections, foundations — and "torque" for twisting effects on rotating shafts, engines, and fasteners. There's no physical difference between a "1 N·m moment" and a "1 N·m torque"; the distinction is purely about which kind of problem an engineer is solving, which is why this site offers a separate Torque Converter for the rotational-drivetrain use case.
Example
1 lbf·in equals 0.083333333 lbf·ft. For scale, a mid-span bending moment of 15,000 N·m (about 132761.19 lbf·in) is a realistic design value for a modest residential floor beam spanning several meters under normal loading — well within a typical steel or engineered-lumber section's capacity.
Frequently Asked Questions
How many Pound-force Feet are in 1 Pound-force Inch?
1 Pound-force Inch (lbf·in) equals exactly 0.083333333 Pound-force Feet (lbf·ft).
What's the difference between moment of force and torque?
Physically, nothing — both are force multiplied by lever-arm distance, measured in the same units (newton meters or pound-force feet). "Moment" is the conventional term in structural and civil engineering for bending effects in beams, columns, and connections, while "torque" is the conventional term for twisting effects in rotating machinery like engines and fasteners.
Why do structural engineers use kilonewton meters instead of newton meters?
Real building and bridge bending moments routinely reach into the tens or hundreds of thousands of newton meters. Reporting "45,000 N·m" is unwieldy compared to "45 kN·m", so kilonewton meters keep structural calculation sheets and drawings readable, the same reasoning that leads American engineers to prefer kips over pounds-force for large loads.
How accurate are these conversions?
Every conversion factor used here is the exact, internationally recognized value (e.g. 1 lbf·ft = exactly 1.3558179483314 N·m, derived from the internationally standardized pound, foot, and standard gravity) — results are limited only by floating-point display precision, not by rounded conversion constants.