ft lb to Newton meter (Nm) Conversion

Last updated: 18 Dec 2025 | Author: Brij | Review By: Irshad

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Convert torque from foot-pounds to newton-meters accurately using this ft-lb to N·m Calculator. Ideal for construction, structural steel, bolt tightening, and mechanical torque conversions.

Torque (Foot-pounds):

ft-lb

Enter torque in foot-pounds (ft-lb)

Torque Conversion Results

Torque (Newton-meters):

N·m

SI unit for torque

Torque (Inch-pounds):

in-lb

Smaller imperial unit

Kilogram-meters:

kgf·m

Metric technical unit

Kilonewton-meters:

kN·m

Large torque unit

Centinewton-meters:

cN·m

Precision torque unit

An ft-lb to Newton-meter Calculator converts torque values from foot-pounds (ft-lb) to newton-meters (N·m).

This conversion is widely used in construction, structural steel work, mechanical installation, and anchor bolt tightening, where torque specifications must follow metric standards.

What Is Foot-Pound (ft-lb)?

A foot-pound (ft-lb) is a unit of torque, representing a force of one pound applied at a perpendicular distance of one foot from a pivot point.

$1 \, \text{ft-lb} = 1 \, \text{lbf} \times 1 \, \text{ft}$

What Is Newton-Meter (N·m)?

A newton-meter (N·m) is the SI unit of torque, defined as a force of one newton applied at a distance of one meter from the axis of rotation.

$1 \, \mathrm{N\cdot m} = 1 \, \text{N} \times 1 \, \text{m}$

ft-lb to Newton-Meter Conversion Formula

Convert ft-lb to N·m

$\mathrm{N\cdot m} = \text{Torque (ft-lb)} \times 1.35582$

Reverse Relationship (Reference)

$1 \, \text{ft-lb} = 1.35582 \, \mathrm{N\cdot m}$

Why This Conversion Is Important in Construction

Bolt and anchor tightening
Structural steel connections
Mechanical equipment installation
Torque wrench calibration
International project specifications

Example Calculation

Given

Torque = 250 ft-lb

Step 1: Apply Conversion Formula

$\mathrm{N\cdot m} = 250 \times 1.35582$

Step 2: Calculate Result

$\mathrm{Torque\ (N\cdot m)} = 338.96$

Final Answer

$\boxed{250 \, \text{ft-lb} = 338.96 \, \mathrm{N\cdot m}}$

FAQs

1. What does ft-lb mean in torque measurement?

ft-lb (foot-pound) is a unit of torque, representing a force of one pound applied at a distance of one foot from a pivot point. It is commonly used in US-based mechanical and construction specifications.

2. Why is ft-lb converted to Newton-meter (N·m)?

Newton-meter is the SI unit of torque. Conversion is required when working with metric standards, international projects, torque wrenches, and manufacturer specifications that use N·m.

3. What is the exact conversion factor from ft-lb to N·m?

The standard conversion is:

$1 \, \text{ft-lb} = 1.35582 \, \mathrm{N\cdot m}$

This value is widely used in engineering and construction calculations.

4. Is ft-lb the same as energy?

No. Although ft-lb can represent energy in some contexts, in construction and torque applications it specifically means torque, not energy. Always check the context to avoid mistakes.

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