What torque unit do UK cars use?

UK manufacturers and workshop manuals now predominantly use Newton-metres (Nm). However, older manuals and American cars use foot-pounds (ft-lb). Many torque wrenches can be set to either unit, but always double-check which unit is specified.

Why is torque important?

In engines, torque determines pulling power and acceleration feel. For mechanics, correct torque settings are critical for safety. Under-tightened bolts can work loose, while over-tightened bolts can strip threads or crack components, particularly on aluminium parts.

What is the difference between Nm and ft-lb?

Newton-metres (Nm) is the SI metric unit of torque. Foot-pounds (ft-lb) is the imperial equivalent. 1 Nm equals approximately 0.738 ft-lb. European and Asian car makers use Nm, while American manufacturers traditionally use ft-lb.

What are typical wheel nut torque settings?

Most cars require wheel nuts tightened to 100-120 Nm (74-89 ft-lb). Always check your specific vehicle manual, as over-tightening can warp brake discs and make wheel removal very difficult.

What is more important for a car, torque or horsepower?

Torque determines pulling force and low-speed acceleration, while horsepower determines top speed and high-speed performance. Diesels have more torque, making them better for towing. Petrol engines often have more horsepower per litre. For everyday driving, a broad torque curve matters most.

CarCalcs

Nm to ft-lb Converter

Convert torque values between Newton-metres, foot-pounds, and kgf-m.

Convert From

Torque (Nm)

How We Calculate This

This converter handles all three common torque units used in automotive applications.

The Formulas

Nm to ft-lb: ft-lb = Nm x 0.737562
ft-lb to Nm: Nm = ft-lb / 0.737562
Nm to kgf-m: kgf-m = Nm x 0.101972

Common Torque Settings

Wheel nuts: 100-120 Nm (74-89 ft-lb)
Spark plugs: 20-30 Nm (15-22 ft-lb)
Oil drain plug: 25-40 Nm (18-30 ft-lb)

Frequently Asked Questions

Related Calculators

MPH to KPH Converter

Convert between miles per hour and kilometres per hour.

Miles to Kilometres Converter

Convert distances between miles and kilometres.

Litres to Gallons Converter

Convert between litres and UK/US gallons.

PSI to Bar Converter

Convert tyre pressures between PSI, bar, and kPa.

BHP to PS Converter

Convert between brake horsepower, PS (metric horsepower), and kW.

Last updated: February 2026

All calculations are estimates. Actual figures may vary based on driving conditions, vehicle specifications, and other factors.