| horsepower-hour | 1 hp·h | 2 hp·h | 3 hp·h | 4 hp·h | 5 hp·h | 6 hp·h | 7 hp·h | 8 hp·h | 9 hp·h | 10 hp·h | 11 hp·h | 12 hp·h | 13 hp·h | 14 hp·h | 15 hp·h | 16 hp·h | 17 hp·h | 18 hp·h | 19 hp·h | 20 hp·h | 21 hp·h | 22 hp·h | 23 hp·h | 24 hp·h | 25 hp·h | 26 hp·h | 27 hp·h | 28 hp·h | 29 hp·h | 30 hp·h | 31 hp·h | 32 hp·h | 33 hp·h | 34 hp·h | 35 hp·h | 36 hp·h | 37 hp·h | 38 hp·h | 39 hp·h | 40 hp·h | 41 hp·h | 42 hp·h | 43 hp·h | 44 hp·h | 45 hp·h | 46 hp·h | 47 hp·h | 48 hp·h | 49 hp·h | 50 hp·h | 51 hp·h | 52 hp·h | 53 hp·h | 54 hp·h | 55 hp·h | 56 hp·h | 57 hp·h | 58 hp·h | 59 hp·h | 60 hp·h | 61 hp·h | 62 hp·h | 63 hp·h | 64 hp·h | 65 hp·h | 66 hp·h | 67 hp·h | 68 hp·h | 69 hp·h | 70 hp·h | 71 hp·h | 72 hp·h | 73 hp·h | 74 hp·h | 75 hp·h | 76 hp·h | 77 hp·h | 78 hp·h | 79 hp·h | 80 hp·h | 81 hp·h | 82 hp·h | 83 hp·h | 84 hp·h | 85 hp·h | 86 hp·h | 87 hp·h | 88 hp·h | 89 hp·h | 90 hp·h | 91 hp·h | 92 hp·h | 93 hp·h | 94 hp·h | 95 hp·h | 96 hp·h | 97 hp·h | 98 hp·h | 99 hp·h | 100 hp·h |
| foot-pound force | 1,979,999.9999999 ft·lbf | 3,959,999.9999997 ft·lbf | 5,939,999.9999996 ft·lbf | 7,919,999.9999995 ft·lbf | 9,899,999.9999994 ft·lbf | 11,879,999.999999 ft·lbf | 13,859,999.999999 ft·lbf | 15,839,999.999999 ft·lbf | 17,819,999.999999 ft·lbf | 19,799,999.999999 ft·lbf | 21,779,999.999999 ft·lbf | 23,759,999.999998 ft·lbf | 25,739,999.999998 ft·lbf | 27,719,999.999998 ft·lbf | 29,699,999.999998 ft·lbf | 31,679,999.999998 ft·lbf | 33,659,999.999998 ft·lbf | 35,639,999.999998 ft·lbf | 37,619,999.999998 ft·lbf | 39,599,999.999997 ft·lbf | 41,579,999.999997 ft·lbf | 43,559,999.999997 ft·lbf | 45,539,999.999997 ft·lbf | 47,519,999.999997 ft·lbf | 49,499,999.999997 ft·lbf | 51,479,999.999997 ft·lbf | 53,459,999.999997 ft·lbf | 55,439,999.999996 ft·lbf | 57,419,999.999996 ft·lbf | 59,399,999.999996 ft·lbf | 61,379,999.999996 ft·lbf | 63,359,999.999996 ft·lbf | 65,339,999.999996 ft·lbf | 67,319,999.999996 ft·lbf | 69,299,999.999996 ft·lbf | 71,279,999.999995 ft·lbf | 73,259,999.999995 ft·lbf | 75,239,999.999995 ft·lbf | 77,219,999.999995 ft·lbf | 79,199,999.999995 ft·lbf | 81,179,999.999995 ft·lbf | 83,159,999.999995 ft·lbf | 85,139,999.999995 ft·lbf | 87,119,999.999994 ft·lbf | 89,099,999.999994 ft·lbf | 91,079,999.999994 ft·lbf | 93,059,999.999994 ft·lbf | 95,039,999.999994 ft·lbf | 97,019,999.999994 ft·lbf | 98,999,999.999994 ft·lbf | 100,979,999.99999 ft·lbf | 102,959,999.99999 ft·lbf | 104,939,999.99999 ft·lbf | 106,919,999.99999 ft·lbf | 108,899,999.99999 ft·lbf | 110,879,999.99999 ft·lbf | 112,859,999.99999 ft·lbf | 114,839,999.99999 ft·lbf | 116,819,999.99999 ft·lbf | 118,799,999.99999 ft·lbf | 120,779,999.99999 ft·lbf | 122,759,999.99999 ft·lbf | 124,739,999.99999 ft·lbf | 126,719,999.99999 ft·lbf | 128,699,999.99999 ft·lbf | 130,679,999.99999 ft·lbf | 132,659,999.99999 ft·lbf | 134,639,999.99999 ft·lbf | 136,619,999.99999 ft·lbf | 138,599,999.99999 ft·lbf | 140,579,999.99999 ft·lbf | 142,559,999.99999 ft·lbf | 144,539,999.99999 ft·lbf | 146,519,999.99999 ft·lbf | 148,499,999.99999 ft·lbf | 150,479,999.99999 ft·lbf | 152,459,999.99999 ft·lbf | 154,439,999.99999 ft·lbf | 156,419,999.99999 ft·lbf | 158,399,999.99999 ft·lbf | 160,379,999.99999 ft·lbf | 162,359,999.99999 ft·lbf | 164,339,999.99999 ft·lbf | 166,319,999.99999 ft·lbf | 168,299,999.99999 ft·lbf | 170,279,999.99999 ft·lbf | 172,259,999.99999 ft·lbf | 174,239,999.99999 ft·lbf | 176,219,999.99999 ft·lbf | 178,199,999.99999 ft·lbf | 180,179,999.99999 ft·lbf | 182,159,999.99999 ft·lbf | 184,139,999.99999 ft·lbf | 186,119,999.99999 ft·lbf | 188,099,999.99999 ft·lbf | 190,079,999.99999 ft·lbf | 192,059,999.99999 ft·lbf | 194,039,999.99999 ft·lbf | 196,019,999.99999 ft·lbf | 197,999,999.99999 ft·lbf |
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 |
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 |
| horsepower-hours | feet-pound force |
|---|---|
| 1 | = 1,979,999.9999999 |
| 5.0505050505054 × 10-7 | = 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 …) |