How do you calculate horsepower from torque and RPM?

Horsepower can be calculated from torque and RPM using the formula: HP = (Torque × RPM) / 5252. This formula works for torque in foot-pounds and horsepower in mechanical horsepower units.

What is the relationship between horsepower and torque?

Horsepower and torque are related through rotational speed (RPM). While torque measures rotational force, horsepower measures the rate at which work is done. The formula connecting them is: HP = (Torque × RPM) / 5252.

How do you convert horsepower to torque?

To convert horsepower to torque at a specific RPM, use the formula: Torque (ft-lbs) = (HP × 5252) / RPM. This gives you the torque value in foot-pounds at that particular RPM.

Horsepower and Torque Calculator | ClayDesk Engineering Tools

Horsepower and Torque Calculator

Convert between horsepower, torque, and RPM instantly

Horsepower (HP)

Torque (ft-lbs)

RPM

Horsepower and Torque Formulas

HP = (Torque × RPM) / 5252

This fundamental formula connects horsepower, torque, and rotational speed.

Why Horsepower and Torque Calculations Matter:

"Horsepower and torque calculator" is frequently searched because:

Automotive enthusiasts want to understand engine performance
Mechanics need to verify engine specifications
Engineers design mechanical systems with power requirements
Racers optimize their vehicles for different track conditions

Key Applications:

Automotive Tuning

Calculating power curves and optimizing gear ratios for performance

Industrial Machinery

Determining motor requirements for specific torque and speed needs

Understanding Horsepower and Torque

When evaluating engine or motor performance, understanding the relationship between horsepower (HP), torque (ft-lbs), and RPM is essential. These three factors are interconnected and determine how a machine performs under different conditions.

How to Calculate Horsepower from Torque and RPM

To calculate horsepower from torque and RPM, use the formula:

HP = (Torque × RPM) / 5252

The constant 5252 comes from the conversion between foot-pounds per minute and horsepower. At 5252 RPM, horsepower and torque values are always equal.

Electric Motor HP to Torque Calculation

For electric motor hp to torque calculations, the same formula applies. For example, a 10 HP motor at 1750 RPM produces:

Torque = (10 × 5252) / 1750 = 30.01 ft-lbs

This calculation is crucial when selecting motors for specific applications where torque requirements are known.

1/4 Mile Calculator Using HP and Torque

While our calculator focuses on the fundamental relationship between HP, torque, and RPM, these values can be used in 1/4 mile calculator hp and torque estimations. Vehicle acceleration depends on:

Power-to-weight ratio
Torque curve characteristics
Gear ratios
Traction conditions

Conversion Tips

Remember the magic number: 5252 RPM (where HP = torque)
Higher RPM generally means more horsepower for the same torque
Diesel engines typically have high torque at low RPM
Our calculator handles both hp to rpm converter and torque to hp calculator functions

Disclaimer

This calculator provides theoretical values based on standard formulas. Actual engine/motor performance may vary due to mechanical efficiency, environmental conditions, and other factors. For critical applications, always consult manufacturer specifications and performance data.

How Our Horsepower Calculator Works