Pound-inches to Ounce-inches

The newton-metre (N·m) is the SI unit of torque. Torque is the product of a force and the perpendicular moment arm to the axis of rotation — it describes rotational tendency, not the force itself. The kilogram-force metre (kgf·m) — called Kilopondmeter (kp·m) in German — equals the torque produced by 1 kg weight over 1 m arm: 1 kgf·m = 9.80665 N·m. The pound-foot (lb·ft) is used in US automotive specifications: 1 lb·ft = 1.3558 N·m. The pound-inch (lb·in = 1/12 lb·ft) and ounce-inch (oz·in = 1/16 lb·in) appear on smaller fasteners, bicycle components, and electric motor specs.

All conversion factors are exact defined constants — there is no measurement uncertainty. For more torque unit pairs, visit the torque conversion hub.

Torque conversions are essential for car specs and tightening bolts — newton-metres, pound-feet, and pound-inches all describe rotational force.

• •One pound-foot is about 1.356 newton-metres — the figure you need to match a US torque-wrench spec.
• •Torque and energy share the unit dimension, but a newton-metre of torque is never written as a joule.
• •Following the maker's torque spec prevents both loose bolts and stripped threads.