Horsepower
Horsepower, abbreviated as HP, is a measure of power or the rate of doing work. It is typically used to describe the work of an engine or machine and is the equivalent of moving 33,000 pounds through the distance of one foot in one minute.
HP Conversion Factor:
- 1 boiler horsepower = 9,809.5 W
- 1 horsepower = 745.699872 or 746 W
- 1 horsepower = 0.746 kW
- 1 Metric horsepower = 735.49875 W
- 1 horsepower = 33,000 lb-ft/min
- 1 horsepower = 550 lb-ft/s
- 1 horsepower = 2544.434187 or 2545 BTU
- 1 horsepower = 3960 gal/min/foot
- 1.341 horsepower = 1 kW
- 1 cu-ft/sec = 448 GPM
- 1 PSI = a head of 2.309 ft (water weight)
Horsepower formulas
| \(\large{ HP = \frac{ F \; d }{ t } }\) |
| \(\large{ HP = \frac{ \tau \; s }{ 5252 } }\) |
| \(\large{ HP = W \; \frac{ v }{ 234^2 } }\) |
Where:
| Units | English | Metric |
| \(\large{ HP }\) = horsepower | \(\large{\frac{lbf-ft}{sec}}\) | \(\large{\frac{J}{s}}\) |
| \(\large{ d }\) = distance | \(\large{ft}\) | \(\large{m}\) |
| \(\large{ F }\) = force | \(\large{lbf}\) | \(\large{\frac{kg-m^2}{s^2}}\) |
| \(\large{ s }\) = speed | \(\large{\frac{ft}{sec}}\) | \(\large{\frac{m}{s}}\) |
| \(\large{ \tau }\) (Greek symbol tau) = torque | \(\large{lbf-ft}\) | \(\large{N-m}\) |
| \(\large{ v }\) = velocity | \(\large{\frac{ft}{sec}}\) | \(\large{\frac{m}{s}}\) |
| \(\large{ W }\) = weight | \(\large{lbf}\) | \(\large{N}\) |
horsepower conversion table
| Horsepower Conversion Table | ||
|---|---|---|
| Multiply | By | To get |
| 2545.45766 | BTU per hour, BTU/hr | |
| 42.42429433 | BTU per minute, BTU/min | |
| 0.707071572 | BTU per second, BTU/sec | |
| 1980796.979 | foot pound-force per hour | |
| 33013.28298 | foot pound-force per minute | |
| 550.221383 | foot pound-force per second | |
| 1 | horsepower, hp | |
| 17702.8489 | pound square foot per cubic second | |
| 0.212121472 | ton of refrigeration, ton | |
| 2.6856E+13 | dyne centimeter per hour | |
| 4.476E+11 | dyne centimeter per minute | |
| 7460000000 | dyne centimeter per second | |
| 2685600 | joule per hour | |
| 44760 | joule per minute | |
| 746 | joule per second | |
| 746 | watt, W | |
| 0.746 | kilowatt, kW | |
| 0.000746 | megawatt, MW | |
| 0.000000746 | gigawatt, GW | |
| 2685600 | newton meter per hour | |
| 44760 | newton meter per minute | |
| 746 | newton meter per second | |
