Car enthusiasts argue about torque in pound-feet, European spec sheets quote newton-meters, and physics class demands joules — the foot-pound sits at the center of that triangle because it measures both energy and torque, depending on context. One foot-pound equals 1.35581795 joules (and the same number of newton-meters, since a joule is a newton-meter). Type 150 into the Foot-pounds (ft·lb) box — a healthy family sedan's torque — and the Joules (J) and Newton-meters (N·m) readouts both show about 203.37, while the Calories (cal) box shows about 48.57. That torque context is where Americans meet it most: lug nuts torqued to 100 ft·lb, engines rated at 300 lb·ft. (Pedants note the order flips — lb·ft for torque, ft·lb for energy — but the unit is identical.) Muzzle energy, wrench settings, and engine specs all speak foot-pounds; multiply by 1.3558 and the metric world understands you. Firearms ballistics uses it too — a 1,000 ft·lb rifle round carries about 1,356 joules, a handy reference when comparing cartridges at a glance.

With the pre-filled defaults — Foot-pounds (ft·lb) 100 — the Foot Pound Converter returns Joules (J) 135.5818, Newton-meters (N·m) 135.5818, Calories (cal) 32.3832. Change any input and those results update instantly, so you can see exactly how each number you enter moves the answer.