Torque Converter
Torque: convert between newton-meters and pound-feet using the exact standard-gravity definition.
How Torque Units Relate
Torque, the rotational equivalent of force, combines a force unit with a distance unit. The pound-foot (or foot-pound) combines the US pound-force with the foot; the newton-meter combines the SI newton with the meter. Because both are built from already-exact force and length definitions, the conversion between them is exact but not round.
All Torque Converters
Each of these has its own page with the exact formula, a reference table, and answers to common questions.