Inch Lbs to Nm

Fastener Mechanics & ISO 6789 Torque Standards

Torque (Moment of Force) is the rotational equivalent of linear force. In the metric system, torque is measured in Newton-meters (N·m), while US Customary mechanics use Inch-pounds (in-lbs) for light fasteners and Foot-pounds (ft-lbs) for heavy chassis bolts.

Primary Torque Multipliers

• 1 Inch-Pound (in-lb): 0.1129848 N·m = (1) / (12) ft-lb ≈ 0.08333 ft-lbs = 1.1521 kgf·cm

• 1 Newton-Meter (N·m): 8.850746 in-lbs = 0.737562 ft-lbs = 10.1972 kgf·cm

• 1 Foot-Pound (ft-lb): = 12 in-lbs = 1.355818 N·m

Equations

• N·m = in-lbs × 0.112984829

• in-lbs = N·m × 8.85074579

How to Use This Calculator

Enter your Torque Value to Convert (e.g. 100.0) and Conversion Direction — choose from Inch-Pounds to Newton-Meters (in-lbs → N·m / multiply by 0.113), Newton-Meters to Inch-Pounds (N·m → in-lbs / multiply by 8.851). Results update instantly as you type — adjust any value to compare scenarios.

The Formula

Conversion factors used in this calculator:

1 in-lb = 0.1129848290276167 N-m

Worked Example

A bicycle carbon seatpost clamp specified at 5.0 N·m of torque requires setting an imperial torque wrench to exactly 44.3 in-lbs (3.69 ft-lbs).

Understanding Your Result

Unit conversion precision: round to the same number of significant figures as your original measurement. Converting 6 feet to meters gives 1.8288 m — but if your measurement was approximate (±1 inch), expressing more than 2 decimal places is false precision. For international trade and technical specifications, SI units (meters, kilograms, liters) are the standard. US customary units (feet, pounds, gallons) differ from Imperial UK units: 1 US gallon = 3.785 L vs. 1 UK gallon = 4.546 L.