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Convert ft-lb to joules

1 foot-pound equals 1.3558179 joules. Enter a value below to convert instantly.

1 ft·lbf
1.3558179 J

Multiply the number of foot-pounds by 1.35581794833 to get joules. How this is calculated

Copy link puts your number after the #, which browsers never send to a server — but the link itself carries it, so anyone you send it to sees the value. Save keeps the unit pair in this browser only; clear it any time from your saved list.

Need the other direction? Convert joule to foot-pound →

Formula

Multiply the number of foot-pounds by 1.35581794833 to get joules.

Step by step

  1. Start with 1 ft·lbf.
  2. Multiply by the conversion factor 1.35581794833.
  3. 1 × 1.35581794833 = 1.3558179 J.

Foot-pounds to Joules conversion table

Foot-pounds (ft·lbf) Joules (J)
1 1.3558179
2 2.7116359
5 6.7790897
10 13.558179
20 27.116359
50 67.790897
100 135.58179
500 677.90897
1,000 1,355.8179

Convert Foot-pound to other energy units

1 ft·lbf expressed in every other energy unit on this site.

  • Joule J 1.3558179
  • Kilojoule kJ 0.0013558179
  • Megajoule MJ 0.0000013558179
  • Gigajoule GJ 1.3558179e-9
  • Millijoule mJ 1,355.8179
  • Microjoule µJ 1,355,817.9
  • Nanojoule nJ 1,355,817,900
  • Attojoule aJ 1.3558179e+18
  • Erg erg 13,558,179
  • Calorie (thermochemical) cal 0.32404827
  • Kilocalorie kcal 0.00032404827
  • Calorie (IT) cal(IT) 0.32383155
  • Kilocalorie (IT) kcal(IT) 0.00032383155
  • Megacalorie Mcal 3.2404827e-7
  • Watt-hour Wh 0.0003766161
  • Kilowatt-hour kWh 3.766161e-7
  • Megawatt-hour MWh 3.766161e-10
  • Gigawatt-hour GWh 3.766161e-13
  • Watt-second W·s 1.3558179
  • Kilowatt-second kW·s 0.0013558179
  • Horsepower-hour hp·h 5.0505051e-7
  • British Thermal Unit BTU 0.0012850675
  • BTU (thermochemical) BTU(th) 0.0012859275
  • MBTU (thousand BTU) MBTU 0.0000012850675
  • MMBTU (million BTU) MMBTU 1.2850675e-9
  • Therm (US) thm (US) 1.2853743e-8
  • Therm (EC) thm (EC) 1.2850624e-8
  • Ton-hour (refrigeration) ton·h 1.0708896e-7
  • Inch-pound in·lbf 12
  • Foot-poundal ft·pdl 32.174049
  • Kilogram-force Meter kgf·m 0.13825495
  • Gram-force Centimeter gf·cm 13,825.495
  • Gram-force Meter gf·m 138.25495
  • Kilogram-force Centimeter kgf·cm 13.825495
  • Ounce-force Inch ozf·in 192
  • Horsepower-hour (metric) PS·h 5.1205539e-7
  • Electronvolt eV 8.46235e+18
  • Kiloelectronvolt keV 8.46235e+15
  • Megaelectronvolt MeV 8,462,350,000,000
  • Gigaelectronvolt GeV 8,462,350,000
  • Hartree Eh 3.1098563e+17
  • Rydberg Ry 6.2197126e+17
  • Ton of TNT tTNT 3.2404827e-10
  • Kiloton of TNT ktTNT 3.2404827e-13
  • Megaton of TNT MtTNT 3.2404827e-16
  • Tonne of Oil Equivalent toe 3.2383155e-11
  • Barrel of Oil Equivalent bboe 2.2161626e-10
  • Gigaton of TNT GtTNT 3.2404827e-19
  • Fuel Oil Equivalent (kiloliter) FOE (kL) 3.3728805e-11
  • Fuel Oil Equivalent (US barrel) FOE (bbl) 2.1240785e-10

About the foot-pound

The foot-pound (ft·lbf) is a Imperial unit of energy.

About the joule

The joule (J) is a SI unit of energy.

Where this conversion is used

Converting foot-pounds to joules comes up when nutrition labels, electricity bills, heating, and physics.

Related conversions

Frequently asked questions

How many joules are in a foot-pound?

One foot-pound equals 1.3558179 joules.

How do you convert foot-pounds to joules?

Multiply the number of foot-pounds by 1.35581794833 to get joules.

What is 1 joule in foot-pounds?

One joule equals 0.73756215 foot-pounds.

When would I convert foot-pounds to joules?

This conversion is common when nutrition labels, electricity bills, heating, and physics.

Conversion factors are based on internationally agreed unit definitions. See our methodology and sources for details on how these values are verified.