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Pound-force inch (lbf·in)

One pound-force acting at one inch: 4.4482216152605 × 0.0254 N·m.

What is a pound-force inch?

Symbol
lbf·in
Quantity
Torque
Unit system
US customary
Definition
One pound-force acting at one inch: 4.4482216152605 × 0.0254 N·m.
Exact
Yes, the value is exact by definition
Source
NIST Special Publication 811 (2008), Appendix B.8

Common applications

Used in the US for small fasteners, bicycle parts and torque screwdrivers.

Pound-force inch in other torque units

Pound-force inch quick reference

Pound-force inch in other units
Pound-force inchNewton meterPound-force footKilonewton meter
1 lbf·in= 0.1129848290276167 N·m≈ 0.08333333333 lbf·ft= 0.0001129848290276167 kN·m
10 lbf·in= 1.129848290276167 N·m≈ 0.8333333333 lbf·ft= 0.001129848290276167 kN·m
100 lbf·in= 11.29848290276167 N·m≈ 8.333333333 lbf·ft= 0.01129848290276167 kN·m
1000 lbf·in= 112.9848290276167 N·m≈ 83.33333333 lbf·ft= 0.1129848290276167 kN·m

Where the pound-force inch fits

The next smaller torque unit is the kilogram-force centimeter (kgf·cm). 1 lbf·in = 1.1521246198 kgf·cm, and 1 kgf·cm ≈ 0.8679616621 lbf·in.

The next larger torque unit is the newton meter (N·m). 1 lbf·in = 0.1129848290276167 N·m, and 1 N·m ≈ 8.850745791 lbf·in.

Frequently asked questions

How many newton meters are in one pound-force inch?
One pound-force inch = 0.1129848290276167 N·m (newton meters).
How many pound-force feet are in one pound-force inch?
One pound-force inch ≈ 0.08333333333 lbf·ft (pound-force feet).
How many kilonewton meters are in one pound-force inch?
One pound-force inch = 0.0001129848290276167 kN·m (kilonewton meters).