Convert between newton-meters (N·m) and foot-pounds (ft·lbs) for torque measurements. Essential for automotive, engineering, and mechanical applications.
Last updated: March 2026 | By Patchworkr Team
Torque is a measure of rotational force. It represents the tendency of a force to rotate an object around an axis, pivot, or fulcrum. Both newton-meters (N·m) and foot-pounds (ft·lbs) measure torque, but they use different unit systems.
The newton-meter (N·m) is the SI (metric) unit of torque, commonly used in most countries and technical specifications. One N·m equals the torque produced by a force of one newton applied at a perpendicular distance of one meter from the axis of rotation.
The foot-pound (ft·lbs) is an imperial unit of torque commonly used in the United States, particularly in automotive applications. One ft·lb equals the torque produced by a force of one pound applied at a perpendicular distance of one foot from the axis.
Converting between these torque units uses these formulas:
Quick reference for typical applications:
Convert 100 N·m to ft·lbs (typical wheel lug nut torque):
(typical lug nut torque specification)
Torque measures rotational force. Common uses include tightening bolts to proper specifications, measuring engine power output, and calibrating tools like torque wrenches.
Neither is inherently better. N·m is used in metric countries and most technical specifications. ft·lbs is common in the US, especially for automotive work. Always match the unit specified in your documentation.
Very accurate for critical applications like engine components or wheel lug nuts. Over-torquing can strip threads or break bolts; under-torquing can lead to loose connections and safety issues.
Not recommended for critical fasteners. Torque wrenches are calibrated tools that click or indicate when the specified torque is reached, ensuring proper tightness without damage.
Torque is rotational force at a moment in time. Power is the rate of doing work over time. In engines, torque × RPM = power. High torque at low RPM gives good pulling power.
Only if your wrench uses different units than your specification. Many modern torque wrenches have dual scales (N·m and ft·lbs) or are switchable between units.
To accommodate different markets. European and Asian markets use N·m, while North American markets traditionally use ft·lbs. Modern service manuals often provide both.
Though the units look similar (N·m vs. Joules), torque is a rotational force, while work/energy (Joules) represents energy transferred. They're fundamentally different physical quantities.
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