Conversor de Torque (N·m ↔ ft-lbs)
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
1 ft·lb = 1,3558 N·m
About this calculator
The Torque Converter (N·m ↔ ft-lbs) is a free online tool that converts torque values between Newton-meter (N·m) and foot-pound (ft·lb). Torque measures rotational force, crucial in automotive mechanics, engineering, and cycling. The conversion uses the fixed ratio: 1 ft·lb equals 1.3558 N·m. Simply enter a value in one unit, and the result appears automatically in the other, with precision up to 4 decimal places.
How it works: the user types a number in the desired field (N·m or ft·lb), and the tool applies multiplication or division by the factor 1.3558. For example, 10 N·m ÷ 1.3558 ≈ 7.38 ft·lb. The calculator also allows instant reverse conversion without extra clicks. Ideal for quick and accurate adjustments in torque specifications, technical manuals, or project calculations.
When to use? Mechanics following vehicle manuals with ft·lb specs (common in American cars) can convert to N·m (international standard). Engineers working with European or Asian standards also benefit. Cyclists adjusting components like cranksets or disc brakes, where torques are given in N·m but the torque wrench reads ft·lb. The tool prevents conversion errors that could damage parts or compromise safety.
Important precautions: the factor 1.3558 is a standard approximation, but high-precision contexts (e.g., aerospace) may require more exact values (1.355817948). Always verify the target unit is correct for your application. Do not confuse foot-pound (ft·lb) with pound-force-foot (lbf·ft), which are equivalent. For very small or large values, the calculator maintains precision, but manual rounding can accumulate errors in series calculations.
Frequently asked questions
What is the difference between N·m and ft·lb?
Newton-meter (N·m) is the SI unit for torque. Foot-pound (ft·lb) is the imperial unit, common in the US and UK. Both measure the same quantity, but with different scales: 1 ft·lb ≈ 1.3558 N·m.
How do I convert 50 N·m to ft·lb?
Divide the N·m value by 1.3558. Example: 50 ÷ 1.3558 ≈ 36.88 ft·lb. You can also use the calculator: enter 50 in the N·m field and see the result automatically.
Does this calculator also convert ft·lb to N·m?
Yes, the conversion is bidirectional. Simply enter a value in ft·lb, and the equivalent in N·m appears instantly, using multiplication by 1.3558.
Can I trust the accuracy for professional use, like in car engines?
Yes, the tool uses the standard factor 1.3558 with 4 decimal places, sufficient for most automotive and industrial applications. For critical specifications, consult the manufacturer's manual.
What does torque in ft·lb mean in practice?
It indicates the tightening force applied at a distance of 1 foot from the rotation axis. For example, tightening a bolt to 20 ft·lb means applying 20 pounds of force at the end of a 1-foot wrench.