Torque Converter

in-lbs to Nm Converter - Inch-pounds to Newton-meters Calculator

Free in-lbs to Nm converter and inch-pounds to newton-meters calculator. Convert between inch-pounds (lbf·in) and newton-meters (N·m) instantly with accurate, real-time conversions. Perfect for torque measurements in automotive repair, engineering applications, construction projects, and mechanical work.

Last updated: January 24, 2026

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in-lbs to Nm Converter
Convert between inch-pounds and newton-meters instantly

How it works:

Enter a value in either field to convert to the other unit. Conversions update automatically as you type.

Conversion factor: 1 in-lb = 0.113 N·m

Understanding Torque Units

Inch-pounds (lbf·in)
Imperial unit of torque

Definition

1 in-lb = 1 lbf × 1 in

The imperial unit for torque, representing the rotational force produced by one pound-force applied at a distance of one inch from the rotation axis.

  • Commonly used in US automotive industry
  • Found in many US tool specifications
  • Ideal for smaller torque values
Newton-meters (N·m)
SI unit of torque

Conversion

1 N·m ≈ 8.85 in-lbs

The standard metric unit for torque, representing the rotational force produced by one newton applied at a distance of one meter from the rotation axis.

  • Commonly used in automotive specifications
  • Standard in engineering and construction
  • Used worldwide except in the US

Quick Example Result

For 100 inch-pounds (in-lbs):

Newton-meters

11.30 N·m

Conversion Factor

0.113 N·m/in-lb

How Our in-lbs to Nm Converter Works

Our in-lbs to Nm converter uses the precise conversion factor based on official unit definitions to convert between inch-pounds and newton-meters. All conversions are calculated in real-time as you type, ensuring instant and accurate results for torque measurements in automotive, engineering, and construction applications.

Conversion Formula

1 in-lb = 0.112984829 N·m
1 N·m = 8.8507457916 in-lbs
To convert in-lbs to Nm: Nm = in-lbs × 0.112984829
To convert Nm to in-lbs: in-lbs = Nm × 8.8507457916

These conversion factors are based on the official definitions: 1 pound-force = 4.4482216153 newtons and 1 inch = 0.0254 meters. The converter uses these precise values to ensure accurate conversions.

Understanding Torque

Torque is a measure of rotational force—the force that causes an object to rotate around an axis. It's a fundamental concept in mechanics, essential for understanding how rotational systems work. Torque is calculated by multiplying force by distance from the rotation point.

  • Torque = Force × Distance: The basic formula for calculating torque
  • Inch-pound (in-lb): Imperial unit representing 1 pound-force at 1 inch distance
  • Newton-meter (N·m): Metric unit representing 1 newton of force at 1 meter distance
  • Applications: Used in automotive repair, construction, manufacturing, and engineering
  • Importance: Correct torque prevents component damage and ensures safety

Practical Applications

Torque conversion is essential in many practical scenarios. Automotive mechanics need to convert between in-lbs and Nm when working with international vehicle specifications. Engineers convert units when using tools calibrated in different systems. Construction workers convert torque values when following specifications from different countries.

Common Use Cases:

  • Automotive repair: Converting torque specifications for engine components, wheels, and fasteners
  • Mechanical engineering: Converting torque values in design specifications and calculations
  • Construction: Converting torque requirements for structural bolts and fasteners
  • Manufacturing: Converting torque settings for assembly line equipment
  • Tool calibration: Converting between torque wrench scales and specifications

Why Accurate Torque Matters

Using the correct torque is critical for safety and performance. Insufficient torque can cause fasteners to loosen, leading to mechanical failures. Excessive torque can strip threads, damage components, or cause stress fractures. Accurate conversion between units ensures you apply the correct torque regardless of which unit system your tools or specifications use.

Sources & References

  • International System of Units (SI) - Bureau International des Poids et Mesures (BIPM)Official definition of the newton-meter and other SI units
  • NIST Guide for the Use of the International System of Units - National Institute of Standards and TechnologyComprehensive reference for unit conversions and torque measurements
  • Khan Academy - Torque and Rotational MotionEducational resources for understanding torque concepts

Need help with other torque conversions? Check out our Nm to in-lbs converter and newton meter calculator.

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in-lbs to Nm Converter Examples

Converting Inch-pounds to Newton-meters
Example: Convert 100 inch-pounds to newton-meters

Input:

  • Torque: 100 inch-pounds (in-lbs)
  • Conversion factor: 1 in-lb = 0.112984829 N·m

Calculation:

  • Step 1: Identify the value in in-lbs: 100 in-lbs
  • Step 2: Multiply by conversion factor: 100 × 0.112984829
  • Step 3: Calculate result: 11.2984829 N·m
  • Step 4: Round to practical precision: 11.30 N·m

Result: 100 inch-pounds equals 11.30 newton-meters

This conversion is commonly used in automotive applications when working with torque specifications that use different unit systems.

50 in-lbs to Nm

50 in-lbs = ?

50 in-lbs = 5.65 N·m

200 in-lbs to Nm

200 in-lbs = ?

200 in-lbs ≈ 22.60 N·m

Frequently Asked Questions

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