| foot-pound force | 1 ft·lbf | 2 ft·lbf | 3 ft·lbf | 4 ft·lbf | 5 ft·lbf | 6 ft·lbf | 7 ft·lbf | 8 ft·lbf | 9 ft·lbf | 10 ft·lbf | 11 ft·lbf | 12 ft·lbf | 13 ft·lbf | 14 ft·lbf | 15 ft·lbf | 16 ft·lbf | 17 ft·lbf | 18 ft·lbf | 19 ft·lbf | 20 ft·lbf | 21 ft·lbf | 22 ft·lbf | 23 ft·lbf | 24 ft·lbf | 25 ft·lbf | 26 ft·lbf | 27 ft·lbf | 28 ft·lbf | 29 ft·lbf | 30 ft·lbf | 31 ft·lbf | 32 ft·lbf | 33 ft·lbf | 34 ft·lbf | 35 ft·lbf | 36 ft·lbf | 37 ft·lbf | 38 ft·lbf | 39 ft·lbf | 40 ft·lbf | 41 ft·lbf | 42 ft·lbf | 43 ft·lbf | 44 ft·lbf | 45 ft·lbf | 46 ft·lbf | 47 ft·lbf | 48 ft·lbf | 49 ft·lbf | 50 ft·lbf | 51 ft·lbf | 52 ft·lbf | 53 ft·lbf | 54 ft·lbf | 55 ft·lbf | 56 ft·lbf | 57 ft·lbf | 58 ft·lbf | 59 ft·lbf | 60 ft·lbf | 61 ft·lbf | 62 ft·lbf | 63 ft·lbf | 64 ft·lbf | 65 ft·lbf | 66 ft·lbf | 67 ft·lbf | 68 ft·lbf | 69 ft·lbf | 70 ft·lbf | 71 ft·lbf | 72 ft·lbf | 73 ft·lbf | 74 ft·lbf | 75 ft·lbf | 76 ft·lbf | 77 ft·lbf | 78 ft·lbf | 79 ft·lbf | 80 ft·lbf | 81 ft·lbf | 82 ft·lbf | 83 ft·lbf | 84 ft·lbf | 85 ft·lbf | 86 ft·lbf | 87 ft·lbf | 88 ft·lbf | 89 ft·lbf | 90 ft·lbf | 91 ft·lbf | 92 ft·lbf | 93 ft·lbf | 94 ft·lbf | 95 ft·lbf | 96 ft·lbf | 97 ft·lbf | 98 ft·lbf | 99 ft·lbf | 100 ft·lbf |
| horsepower-hour | 5.0505050505054 × 10-7 hp·h | 1.0101010101011 × 10-6 hp·h | 1.5151515151516 × 10-6 hp·h | 2.0202020202022 × 10-6 hp·h | 2.5252525252527 × 10-6 hp·h | 3.0303030303032 × 10-6 hp·h | 3.5353535353538 × 10-6 hp·h | 4.0404040404043 × 10-6 hp·h | 4.5454545454548 × 10-6 hp·h | 5.0505050505054 × 10-6 hp·h | 5.5555555555559 × 10-6 hp·h | 6.0606060606065 × 10-6 hp·h | 6.565656565657 × 10-6 hp·h | 7.0707070707075 × 10-6 hp·h | 7.5757575757581 × 10-6 hp·h | 8.0808080808086 × 10-6 hp·h | 8.5858585858591 × 10-6 hp·h | 9.0909090909097 × 10-6 hp·h | 9.5959595959602 × 10-6 hp·h | 1.0101010101011 × 10-5 hp·h | 1.0606060606061 × 10-5 hp·h | 1.1111111111112 × 10-5 hp·h | 1.1616161616162 × 10-5 hp·h | 1.2121212121213 × 10-5 hp·h | 1.2626262626263 × 10-5 hp·h | 1.3131313131314 × 10-5 hp·h | 1.3636363636365 × 10-5 hp·h | 1.4141414141415 × 10-5 hp·h | 1.4646464646466 × 10-5 hp·h | 1.5151515151516 × 10-5 hp·h | 1.5656565656567 × 10-5 hp·h | 1.6161616161617 × 10-5 hp·h | 1.6666666666668 × 10-5 hp·h | 1.7171717171718 × 10-5 hp·h | 1.7676767676769 × 10-5 hp·h | 1.8181818181819 × 10-5 hp·h | 1.868686868687 × 10-5 hp·h | 1.919191919192 × 10-5 hp·h | 1.9696969696971 × 10-5 hp·h | 2.0202020202022 × 10-5 hp·h | 2.0707070707072 × 10-5 hp·h | 2.1212121212123 × 10-5 hp·h | 2.1717171717173 × 10-5 hp·h | 2.2222222222224 × 10-5 hp·h | 2.2727272727274 × 10-5 hp·h | 2.3232323232325 × 10-5 hp·h | 2.3737373737375 × 10-5 hp·h | 2.4242424242426 × 10-5 hp·h | 2.4747474747476 × 10-5 hp·h | 2.5252525252527 × 10-5 hp·h | 2.5757575757577 × 10-5 hp·h | 2.6262626262628 × 10-5 hp·h | 2.6767676767678 × 10-5 hp·h | 2.7272727272729 × 10-5 hp·h | 2.777777777778 × 10-5 hp·h | 2.828282828283 × 10-5 hp·h | 2.8787878787881 × 10-5 hp·h | 2.9292929292931 × 10-5 hp·h | 2.9797979797982 × 10-5 hp·h | 3.0303030303032 × 10-5 hp·h | 3.0808080808083 × 10-5 hp·h | 3.1313131313133 × 10-5 hp·h | 3.1818181818184 × 10-5 hp·h | 3.2323232323234 × 10-5 hp·h | 3.2828282828285 × 10-5 hp·h | 3.3333333333335 × 10-5 hp·h | 3.3838383838386 × 10-5 hp·h | 3.4343434343437 × 10-5 hp·h | 3.4848484848487 × 10-5 hp·h | 3.5353535353538 × 10-5 hp·h | 3.5858585858588 × 10-5 hp·h | 3.6363636363639 × 10-5 hp·h | 3.6868686868689 × 10-5 hp·h | 3.737373737374 × 10-5 hp·h | 3.787878787879 × 10-5 hp·h | 3.8383838383841 × 10-5 hp·h | 3.8888888888891 × 10-5 hp·h | 3.9393939393942 × 10-5 hp·h | 3.9898989898992 × 10-5 hp·h | 4.0404040404043 × 10-5 hp·h | 4.0909090909094 × 10-5 hp·h | 4.1414141414144 × 10-5 hp·h | 4.1919191919195 × 10-5 hp·h | 4.2424242424245 × 10-5 hp·h | 4.2929292929296 × 10-5 hp·h | 4.3434343434346 × 10-5 hp·h | 4.3939393939397 × 10-5 hp·h | 4.4444444444447 × 10-5 hp·h | 4.4949494949498 × 10-5 hp·h | 4.5454545454548 × 10-5 hp·h | 4.5959595959599 × 10-5 hp·h | 4.6464646464649 × 10-5 hp·h | 4.69696969697 × 10-5 hp·h | 4.7474747474751 × 10-5 hp·h | 4.7979797979801 × 10-5 hp·h | 4.8484848484852 × 10-5 hp·h | 4.8989898989902 × 10-5 hp·h | 4.9494949494953 × 10-5 hp·h | 5.0000000000003 × 10-5 hp·h | 5.0505050505054 × 10-5 hp·h |
The foot-pound force (symbol: ft·lbf or ft·lb), sometimes erroneously referred to as feet per pound (symbol: ft/lb), is a unit of work or energy in the Engineering and Gravitational Systems in United States customary and imperial units of measure. It is the energy transferred upon applying a force of one pound-force (lbf) through a linear displacement of one foot. The corresponding SI unit is the joule.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| foot-pound force | ft·lbf | ≡ ɡ0 × 1 lb × 1 ft | = 1.3558179483314004 J | Imperial/US |
| feet-pound force | horsepower-hours | feet-pound force | horsepower-hours |
|---|---|---|---|
| 1 | = 5.0505050505054E-7 | 6 | = 3.0303030303032E-6 |
| 2 | = 1.0101010101011E-6 | 7 | = 3.5353535353538E-6 |
| 3 | = 1.5151515151516E-6 | 8 | = 4.0404040404043E-6 |
| 4 | = 2.0202020202022E-6 | 9 | = 4.5454545454548E-6 |
| 5 | = 2.5252525252527E-6 | 10 | = 5.0505050505054E-6 |
A horsepower-hour (hph) is an outdated unit of energy, not used in the SI system of units. The unit represents an amount of work a horse is supposed capable of delivering during an hour (1 (one) horsepower integrated over a time interval of an hour). Based on differences in the definition of what constitutes the 'power of a horse', a horsepower-hour differs slightly from the German "Pferdestärkenstunde" (PSh):
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| horsepower-hour | hp·h | ≡ 1 hp × 1 h | = 2.684519537696172792×106 J | Metric system Non-SI |
| horsepower-hours | feet-pound force | horsepower-hours | feet-pound force |
|---|---|---|---|
| 1 | = 1979999.9999999 | 6 | = 11879999.999999 |
| 2 | = 3959999.9999997 | 7 | = 13859999.999999 |
| 3 | = 5939999.9999996 | 8 | = 15839999.999999 |
| 4 | = 7919999.9999995 | 9 | = 17819999.999999 |
| 5 | = 9899999.9999994 | 10 | = 19799999.999999 |
| feet-pound force | horsepower-hours |
|---|---|
| 1 | = 5.0505050505054 × 10-7 |
| 1,979,999.9999999 | = 1 |
| Symbol | Definition |
|---|---|
| ≡ | exactly equal |
| ≈ | approximately equal to |
| = | equal to |
| digits | indicates that digits repeat infinitely (e.g. 8.294 369 corresponds to 8.294 369 369 369 369 …) |