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Foot-Pound Converters

Convert foot-pounds to joules, newton meters, calories, BTU, kilowatt-hours and other energy units.

What this tool does

Convert foot-pounds to joules, newton meters, calories, BTU, kilowatt-hours and other energy units. Type an amount in foot pounds-force, choose the units, and the tool converts it to joules. It offers 10 energy units and also shows the same amount in the others.

Inputs

  • Value: A number.
  • From: Choose one from 10 options, including Foot pound-force, Joule, Newton meter (as energy), Kilowatt-hour, Watt-hour, Calorie (thermochemical). Starts as Foot pound-force.
  • To: Choose one of the same 10 units as "From". Starts as Joule.

How to use

  1. Enter the amount you want to convert.
  2. Choose the unit to convert from and the unit to convert to.
  3. Read the result: the converted amount and the same amount in the other units. It appears once every required field has a valid value.

Worked examples

Conversions from foot pounds-force to joules:

  • 1 ft·lbf ≈ 1.355818 J
  • 5 ft·lbf ≈ 6.77909 J
  • 10 ft·lbf ≈ 13.558179 J
  • 50 ft·lbf ≈ 67.790897 J
  • 100 ft·lbf ≈ 135.581795 J

Multiply the number of foot pounds-force by about 1.355818 to get joules. The factor follows from exact definitions. It has more digits than fit here, so it is shown rounded.

Sources: Foot pound-force: exact by definition. Joule: SI Brochure, 9th edition (2019).

Limitations

  • Converts units of energy only. It does not work out energy from power, time, voltage or charge.
  • Treats foot-pounds as energy. Torque in pound-feet is a separate unit and is not converted here.

FAQs

Q: How many joules are in one foot pound-force?
A: One foot pound-force is about 1.3558179 joules. Change the value to convert any amount; the other units are listed below the result.
Q: Which definition of the units does this page use?
A: The unit is the foot pound-force (ft-lbf), the energy of one pound-force acting through one foot. Calories here are thermochemical calories (1 cal = 4.184 J exactly), the definition commonly used in chemistry and nutrition. The International Table calorie (4.1868 J) is slightly larger.
Q: Can I convert from joules to foot pounds-force?
A: Yes. Choose joule in the From box and foot pound-force in the To box. One joule is about 0.73756215 foot pounds-force.

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