How do you convert foot-pounds to horsepower in torque?
William Rodriguez
Published Jan 20, 2026
When you choose horsepower, this calculator will measure the approximate horsepower of an engine based on the torque of the engine (measured in foot-pounds) multiplied by the RPM of the engine, divided by 5,252 (conversion between foot-pounds and horsepower).
Can you convert torque to hp?
The equation to calculate horsepower is simple: Horsepower = Torque x RPM / 5,252. You can use our horsepower calculator below to try it out yourself. When it comes to understanding how a dynamometer measures torque and calculates power, it will help to know a few more basic definitions and formulas.
How do you calculate torque hp?
- Torque (lb.in) = 63,025 x Power (HP) / Speed (RPM)
- Power (HP) = Torque (lb.in) x Speed (RPM) / 63,025.
- Torque (N.m) = 9.5488 x Power (kW) / Speed (RPM)
- Power (kW) = Torque (N.m) x Speed (RPM) / 9.5488.
How much torque does 1 hp have?
The 1800 RPM, 1HP motor produces 3 ft. lbs of torque at 1800 RPM. The 3600 RPM, 1HP motor produces 1.5 ft.
How do I calculate torque?
A practical way to calculate the magnitude of the torque is to first determine the lever arm and then multiply it times the applied force. The lever arm is the perpendicular distance from the axis of rotation to the line of action of the force. and the magnitude of the torque is τ = N m.
41 related questions foundHow is motor horsepower calculated?
The quickest method to closely estimate motor horsepower is to use a digital clamp meter to measure current and voltage to the motor, and then perform a simple calculation. Use this formula to estimate motor horsepower. Horsepower(hp)= Voltage x Amperage x % EFF x power factor x 1.73/746.
How do you convert in lbs to horsepower?
Divide the number of horsepower by 0.00181818 to convert to foot-pounds per second. For example, if you had 20 hp, you would divide 20 by 0.00181818 to get 11,000 foot-pounds per second. Multiply the number of horsepower by 550 ft*lb/s per hp to check your answer.
Is torque lb ft or ft lb?
Torque is always measured in force at a radius. The correct measurement is lbf-ft or “pounds force foot”, which we shorten to lb-ft. The metric guys always have it right, when they express torque in terms of Nm, or Newton-meter.
How many pounds equal a horsepower?
Weight to power is one way to get a general idea of acceleration performance. For example, if I have a 3500 lb car with 215 horsepower, I simply divide 3500 by 215 to get a weight to power ratio of 16.28 lbs per horsepower. The same car with 250 hp would have a weight to power ratio of 14 lbs per horsepower.
How Stuff Works horsepower vs torque?
You can easily convert torque to horsepower by multiplying torque by rpm/5,252. You can get an idea of how a dynamometer works in the following way: Imagine that you turn on a car engine, put it in neutral and floor it.
At what rpm does horsepower equal torque?
One horsepower is equal to 33,000 foot-pounds of work per minute. Add in the equations relating to torque and velocity, and you'll find that horsepower always equals torque multiplied by rpm, divided by 5,252. Canceling out the equal variables, you wind up with horsepower equaling torque... at 5,252 rpm.
How many Nm are in ft lbs?
One foot-pound (ft/lb) is equal to 1.356 newton-meters (Nm).
What is a horsepower equal to?
horsepower, the common unit of power; i.e., the rate at which work is done. In the British Imperial System, one horsepower equals 33,000 foot-pounds of work per minute—that is, the power necessary to lift a total mass of 33,000 pounds one foot in one minute.
How do you calculate watts from RPM and torque?
Calculate the motor power rating in watts of the ac motor which has rated torque of 144Nm at 1480 rpm. Apply our torque to watt conversion formula, Motor power in watt = 0.105 * 144 * 1480 = 22306 Watts.
What is torque for motor?
Torque: The torque output of a motor is the amount of rotational force that the motor develops. The torque of a small electric motor is commonly measured in either inch pounds (in-lbs), Newton meters (N-m) or other directly converted units of measure.
How do you read a foot-pound torque wrench?
Look at the meter at the bottom of the torque wrench.
The numbers represent the amount of torque in either foot-pounds (ft. -lbs.) or Newton meters (Nm). Wherever the arrow is pointed designates the amount of torque that you're applying to a lug or nut. In the stationary position, the wrench should read 0.
How is stall torque calculated?
Ohm's Law states that current is equal to the supplied voltage divided by the resistance. This would be the starting/stall current. If the motor's torque constant (Kt) is known you can take Kt* the current and determine the starting/stall torque.
How do you calculate maximum torque of a motor?
Calculate torque (T) using the formula T = 5,252 x horsepower/rpm. The results are measured in pound-feet. For example, if you have a 40-horsepower motor designed to operate at a peak of 1,200 rpm, the formula would be T = (5,252 x 40)/1200 = 175.07 lb. -feet.
How do you calculate weight from torque?
To convert torque to weight, divide the total torque by the distance from the center of the object that the torque is applied at. This is also known simply as force since weight is a force.
How is wrench torque calculated?
The calculator will work out what value you should set into the wrench to achieve the required fastener torque. The following formula has been used: M1 = M2 x L1 / L2.
How much horsepower does a duck power have?
It dictates that an animal's rate of consumption, or metabolic rate, is about the same as its mass, multiplied to the power of 3/4. The next step is to divide the mass of a duck by the mass of a horse and complete Kleiber's law. This gives a value of 131.2 duckpower to one horsepower.