Foot-pounds to Kilojoules Converter

To convert a measurement in foot-pounds to kilojoules, multiply the value by 0.001355817948. The conversion factor comes from the relationship between both units and the joule.

For example, to convert 5 ft·lb to kilojoules: 5 × 0.001355817948 = 0.006779089742 kJ.

A foot-pound is an imperial unit of energy equal to the work done when a force of one pound-force acts through a distance of one foot, about 1.356 joules. The foot-pound comes from imperial mechanics and is still used in the US for torque and energy, notably to describe the muzzle energy of firearms and the output of engines.

Common uses of foot-pounds include: Firearm muzzle energy; Torque specifications (as ft·lbf); Mechanical work in imperial units; Engine and tool energy ratings.

A kilojoule equals 1,000 joules and is the standard metric unit for expressing food energy on nutrition labels in most of the world. As metric countries adopted SI units for food labeling, the kilojoule replaced the food calorie on packaging in regions such as Australia, New Zealand, and the European Union (shown alongside kcal).

Common uses of kilojoules include: Food energy on nutrition labels; Dietary and exercise energy tracking; Chemical reaction energy (enthalpy); Battery and mechanical energy specs.

Here are some common values converted:

1 ft·lb = 0.001355817948 kJ 5 ft·lb = 0.006779089742 kJ 10 ft·lb = 0.013558179483 kJ 50 ft·lb = 0.067790897417 kJ 100 ft·lb = 0.135581794833 kJ