| Common Work & Energy Measure (Year of 1757) |
| 1 HP | = | 1 bhp, or 1 bHP, or 1 Bhp (brake horsepower), or 1 shp (shaft horsepower) |
| 1 HP | = | 1 SAEhp (Society of Automotive Engineers) |
| 1 HP | = | 3300 av.lb. raised 1 ft./min. |
| 1 HP | = | (torque, or ft.lb. x rpm) ÷ 5252 | (rpm = rev. per min.) |
| 1 HP | = | 6.2832 ft.lb. @ 5252 rpm = 33000 ft.lb./min. | (6.2832 = 2π radius) |
| 1 HP | = | 1980000 ft.lb./hr. |
| 1 HP | = | 550 ft.lb./sec. |
| 1 ft.lb. | = | 1 av.lb. on end of weightless horizontal bar, 1 ft. from fulcrum = torque |
| 1 ft.lb. | = | 1.355818 joule = 0.323832 gravre calorie |
| 1 pdl. | = | 1 poundal = 0.031081 av.lb. = force = 0.042140 joule |
| 1 lbf. | = | 1 pound force = 32.174 pdl. = force |
| 1 slug or geepound | = | 32.174 av.lb. = mass |
| 1 HP | = | 745.6998 Watt |
| 1 HP | = | 0.7456998 kiloWatt |
| 1 HP | = | 1.01387 PS, or DINps (Deutsches Institut fur Normung pferde staerke) |
| 1 HP | = | 1.01387 cv (cheval vapeur) |
| 1 HP | = | 2685600 joule (absolute) | (US & UK electrical rating) |
| 1 HP | = | 2684500 joule (absolute) | (HP-hour) |
| 1 HP | = | 641280 gravre calorie |
| 1 HP | = | 641.28 food calorie |
| 1 ihp | = | indicated horsepower = pressure @ engine cylinders |
| 1 fhp | = | friction horsepower = power lost through friction, heat & compression |
| 1 ehp | = | effective horsepower = final power to equipment |
| 1 rhp | = | rated horsepower = efficient power sustained over a designated time period |
| 1 Thp | = | 1 HP measured in mile-pounds per hr. (jet engines & rockets) |
| 1 Thp | = | thrust in pound force x speed of vehicle in miles per hr. ÷ 375 |
| 1 HP | = | 2545 BTU/hr. | (Britains Thermal Units) |
| 1 HP | = | 42.416666 BTU/min. |
| 1 BTU | = | energy = heat to raise 1 av.lb. distilled water from 39.2° to 40.2° |
| 1 BTU | = | 0.0003927 HP/hr. |
| 1 BTU | = | 0.0235756 HP/min. |
| 1 BTU | = | 1055.06 joule |
| 1 BTU | = | 1055.06 newton metre (Nm) |
| 1 BTU | = | 1055.06 Watt second |
| 1 BTU | = | 0.000293071 kiloWatt hour (kWhr) |
| 1 BTU | = | 10550600000 erg |
| 1 BTU | = | 778.1711 ft./lb. |
| 1 BTU | = | 25020.1 poundals |
| 1 BTU | = | 251.997 gravre calorie |
| 1 BTU | = | 0.251997 food calorie |
| 132500 BTU | = | 1 fl.gal. kerosene | 230.4 cu.in. |
| 121000 BTU | = | 1 fl.gal. naphtha | 230.4 cu.in. |
| 119200 BTU | = | 1 fl.gal. white gasoline | 230.4 cu.in. |
| 101000 BTU | = | 1 fl.gal. butane | 230.4 cu.in. |
| 91800 BTU | = | 1 fl.gal. propane | 230.4 cu.in. |
| 64400 BTU | = | 1 fl.gal. alcohol | 230.4 cu.in. |
| 1 joule | = | 1 newton metre = 1 Watt second = 0.737561 ft.lb. |
| 1 electron volt | = | 1.60219 x (10 to the 19th power) joule |
| LEATHER SEALER'S OFFICE, Londonderry, Vt. | April 8th 1826 | Rory Ely Cole |
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| Copyright © MMII Rory Ely Cole |