| 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 |
| zeptojoule | 2.684519537696 × 1027 zJ | 5.369039075392 × 1027 zJ | 8.053558613088 × 1027 zJ | 1.0738078150784 × 1028 zJ | 1.342259768848 × 1028 zJ | 1.6107117226176 × 1028 zJ | 1.8791636763872 × 1028 zJ | 2.1476156301568 × 1028 zJ | 2.4160675839264 × 1028 zJ | 2.684519537696 × 1028 zJ | 2.9529714914656 × 1028 zJ | 3.2214234452352 × 1028 zJ | 3.4898753990048 × 1028 zJ | 3.7583273527744 × 1028 zJ | 4.026779306544 × 1028 zJ | 4.2952312603136 × 1028 zJ | 4.5636832140832 × 1028 zJ | 4.8321351678528 × 1028 zJ | 5.1005871216224 × 1028 zJ | 5.369039075392 × 1028 zJ | 5.6374910291616 × 1028 zJ | 5.9059429829312 × 1028 zJ | 6.1743949367008 × 1028 zJ | 6.4428468904704 × 1028 zJ | 6.71129884424 × 1028 zJ | 6.9797507980096 × 1028 zJ | 7.2482027517792 × 1028 zJ | 7.5166547055488 × 1028 zJ | 7.7851066593184 × 1028 zJ | 8.053558613088 × 1028 zJ | 8.3220105668576 × 1028 zJ | 8.5904625206272 × 1028 zJ | 8.8589144743968 × 1028 zJ | 9.1273664281664 × 1028 zJ | 9.395818381936 × 1028 zJ | 9.6642703357056 × 1028 zJ | 9.9327222894752 × 1028 zJ | 1.0201174243245 × 1029 zJ | 1.0469626197014 × 1029 zJ | 1.0738078150784 × 1029 zJ | 1.1006530104554 × 1029 zJ | 1.1274982058323 × 1029 zJ | 1.1543434012093 × 1029 zJ | 1.1811885965862 × 1029 zJ | 1.2080337919632 × 1029 zJ | 1.2348789873402 × 1029 zJ | 1.2617241827171 × 1029 zJ | 1.2885693780941 × 1029 zJ | 1.315414573471 × 1029 zJ | 1.342259768848 × 1029 zJ | 1.369104964225 × 1029 zJ | 1.3959501596019 × 1029 zJ | 1.4227953549789 × 1029 zJ | 1.4496405503558 × 1029 zJ | 1.4764857457328 × 1029 zJ | 1.5033309411098 × 1029 zJ | 1.5301761364867 × 1029 zJ | 1.5570213318637 × 1029 zJ | 1.5838665272406 × 1029 zJ | 1.6107117226176 × 1029 zJ | 1.6375569179946 × 1029 zJ | 1.6644021133715 × 1029 zJ | 1.6912473087485 × 1029 zJ | 1.7180925041254 × 1029 zJ | 1.7449376995024 × 1029 zJ | 1.7717828948794 × 1029 zJ | 1.7986280902563 × 1029 zJ | 1.8254732856333 × 1029 zJ | 1.8523184810102 × 1029 zJ | 1.8791636763872 × 1029 zJ | 1.9060088717642 × 1029 zJ | 1.9328540671411 × 1029 zJ | 1.9596992625181 × 1029 zJ | 1.986544457895 × 1029 zJ | 2.013389653272 × 1029 zJ | 2.040234848649 × 1029 zJ | 2.0670800440259 × 1029 zJ | 2.0939252394029 × 1029 zJ | 2.1207704347798 × 1029 zJ | 2.1476156301568 × 1029 zJ | 2.1744608255338 × 1029 zJ | 2.2013060209107 × 1029 zJ | 2.2281512162877 × 1029 zJ | 2.2549964116646 × 1029 zJ | 2.2818416070416 × 1029 zJ | 2.3086868024186 × 1029 zJ | 2.3355319977955 × 1029 zJ | 2.3623771931725 × 1029 zJ | 2.3892223885494 × 1029 zJ | 2.4160675839264 × 1029 zJ | 2.4429127793034 × 1029 zJ | 2.4697579746803 × 1029 zJ | 2.4966031700573 × 1029 zJ | 2.5234483654342 × 1029 zJ | 2.5502935608112 × 1029 zJ | 2.5771387561882 × 1029 zJ | 2.6039839515651 × 1029 zJ | 2.6308291469421 × 1029 zJ | 2.657674342319 × 1029 zJ | 2.684519537696 × 1029 zJ |
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):
| 1 horsepower-hours = 2.684519537696E+27 zeptojoules | 6 horsepower-hours = 1.6107117226176E+28 zeptojoules |
| 2 horsepower-hours = 5.369039075392E+27 zeptojoules | 7 horsepower-hours = 1.8791636763872E+28 zeptojoules |
| 3 horsepower-hours = 8.053558613088E+27 zeptojoules | 8 horsepower-hours = 2.1476156301568E+28 zeptojoules |
| 4 horsepower-hours = 1.0738078150784E+28 zeptojoules | 9 horsepower-hours = 2.4160675839264E+28 zeptojoules |
| 5 horsepower-hours = 1.342259768848E+28 zeptojoules | 10 horsepower-hours = 2.684519537696E+28 zeptojoules |
The zeptojoule (zJ) is equal to one sextillionth (10−21) of one joule. 160 zeptojoules is about one electronvolt.
| 1 zeptojoules = 3.7250613599864E-28 horsepower-hours | 6 zeptojoules = 2.2350368159919E-27 horsepower-hours |
| 2 zeptojoules = 7.4501227199729E-28 horsepower-hours | 7 zeptojoules = 2.6075429519905E-27 horsepower-hours |
| 3 zeptojoules = 1.1175184079959E-27 horsepower-hours | 8 zeptojoules = 2.9800490879891E-27 horsepower-hours |
| 4 zeptojoules = 1.4900245439946E-27 horsepower-hours | 9 zeptojoules = 3.3525552239878E-27 horsepower-hours |
| 5 zeptojoules = 1.8625306799932E-27 horsepower-hours | 10 zeptojoules = 3.7250613599864E-27 horsepower-hours |
| 1 horsepower-hours = 2.684519537696 × 1027 zeptojoules |
| 1 zeptojoules = 3.7250613599864 × 10-28 horsepower-hours |