Calculating torque from horsepower

Torque= (horsepower x 5252) ÷ engine rpm

Calculating torque from horsepower

Torque= (horsepower x 5252) ÷ engine rpm

The reason why the constant of 5252 is if you look at dyno charts etc. torque and horsepower always meet at 5252 this is because one horsepower is defined as 33,000 lb-ft / minute. The circumference of a one-foot radius circle is 6.2832 feet. Since these are both constants, you can divide 33,000 by 6.2832 to get 5252. Keep in mind this only happens with imperial units

Or

Power= torque/radius x 2πr(rpm)

Power= torque x 2πr(rpm)

1hp= 33,000 lb-ft / minute

Power= torque x 2πr(rpm)
————————————-
33,000

2π/ 33,000= 1/5252

Hp= ((torque x rpm)5252)