Convert foot-pounds to joules
1 ft·lbf = 1.35581794833 J — exactly. Both units are defined against the SI, so this factor is a fraction, not an approximation.
1.355 817 948 33J
Exact decimal: 1.3558179483314004
As a fraction: 3389544870828501/2500000000000000
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1 ft·lbf = 1.35581794833 J
Show this value in all 39 energy & work units
- Petajoules PJ 1.35581794833e-15
- Terajoules TJ 1.35581794833e-12
- Gigajoules GJ 1.35581794833e-9
- Megajoules MJ 0.000 001 355 817 948 33
- Kilojoules kJ 0.001 355 817 948 33
- Joules J 1.355 817 948 33
- Millijoules mJ 1355.817 948 33
- Microjoules µJ 1 355 817.948 33
- Nanojoules nJ 1 355 817 948.33
- Watt-hours Wh 0.000 376 616 096 759
- Kilowatt-hours kWh 0.000 000 376 616 096 759
- Megawatt-hours MWh 3.76616096759e-10
- Gigawatt-hours GWh 3.76616096759e-13
- Terawatt-hours TWh 3.76616096759e-16
- Calorie (thermochemical)s cal 0.324 048 266 81
- Kilocalories kcal 0.000 324 048 266 81
- Calorie (IT)s cal (IT) 0.323 831 553 533
- Kilocalorie (IT)s kcal (IT) 0.000 323 831 553 533
- British thermal units BTU 0.001 285 067 463 46
- BTU (thermochemical)s BTU (th) 0.001 285 927 773 82
- Million BTUs MMBTU 1.28506746346e-9
- Therm (US)s thm 1.28537429544e-8
- Therm (EC)s thm (EC) 1.28506728395e-8
- Electronvolts eV 8.46235002783e+18
- Kiloelectronvolts keV 8 462 350 027 830 000
- Megaelectronvolts MeV 8 462 350 027 830
- Gigaelectronvolts GeV 8 462 350 027.83
- Teraelectronvolts TeV 8 462 350.027 83
- Ergs erg 13 558 179.4833
- Foot-pounds ft·lbf 1
- Inch-pounds in·lbf 12
- Foot-poundals ft·pdl 32.174 048 556 4
- Horsepower-hours hp·h 0.000 000 505 050 505 051
- Tonne of TNTs t TNT 3.2404826681e-10
- Kiloton of TNTs kt TNT 3.2404826681e-13
- Megaton of TNTs Mt TNT 3.2404826681e-16
- Hartrees Eₕ 3.10985627536e+17
- Rydbergs Ry 6.21971255072e+17
- Quads quad 1.28506746346e-18
Every row is Foot-pound (ft·lbf) converted through the joule, in exact rational arithmetic.
How to convert foot-pounds to joules
Multiply the number of foot-pounds by 1.35581794833 to get joules.
The exact factor is 1.3558179483314004 — as a fraction, 3389544870828501/2500000000000000.
Foot-pound to Joule conversion table
| Foot-pounds (ft·lbf) | Joules (J) |
|---|---|
| 1 ft·lbf | 1.355 817 9 |
| 2 ft·lbf | 2.711 635 9 |
| 3 ft·lbf | 4.067 453 8 |
| 5 ft·lbf | 6.779 089 7 |
| 10 ft·lbf | 13.558 179 |
| 20 ft·lbf | 27.116 359 |
| 25 ft·lbf | 33.895 449 |
| 50 ft·lbf | 67.790 897 |
| 100 ft·lbf | 135.581 79 |
| 250 ft·lbf | 338.954 49 |
| 500 ft·lbf | 677.908 97 |
| 1000 ft·lbf | 1355.8179 |
Joule to Foot-pound conversion table
| Joules (J) | Foot-pounds (ft·lbf) |
|---|---|
| 1 J | 0.737 562 15 |
| 2 J | 1.475 124 3 |
| 3 J | 2.212 686 4 |
| 5 J | 3.687 810 7 |
| 10 J | 7.375 621 5 |
| 20 J | 14.751 243 |
| 25 J | 18.439 054 |
| 50 J | 36.878 107 |
| 100 J | 73.756 215 |
| 250 J | 184.390 54 |
| 500 J | 368.781 07 |
| 1000 J | 737.562 15 |
Frequently asked
How many joules are in a foot-pound?
One foot-pound equals 1.355817948 joules (ft·lbf → J). That figure is exact, not rounded.
How do you convert foot-pounds to joules?
Multiply the number of foot-pounds by 1.35581794833 to get joules.
What is 1 J in foot-pounds?
One joule is 0.7375621493 foot-pounds.
What is 10 ft·lbf in J?
10 ft·lbf = 13.558 179 J.