Use this torque to hp calculator to convert horsepower from torque rpm using HP = (Torque × RPM) ÷ 5252 formula.
Torque to HP Calculator
| Engine Type | Torque (lb-ft) | RPM | Calculated HP |
|---|---|---|---|
| Compact Car | 110 | 4,000 | 83.8 |
| Muscle Car | 400 | 5,500 | 419.8 |
| Diesel Truck | 650 | 2,800 | 346.5 |
| Motorcycle | 75 | 7,000 | 100.0 |
| Lawn Mower | 8 | 3,600 | 5.5 |
| Sports Car | 300 | 6,000 | 342.7 |
| SUV | 250 | 4,500 | 202.5 |
| Heavy-Duty Truck | 1,200 | 1,600 | 227.3 |
| Electric Vehicle | 400 | 5,000 | 380.9 |
| Go-Kart | 30 | 8,000 | 38.1 |
| ATV | 50 | 6,500 | 62.5 |
| Hybrid Vehicle | 150 | 3,800 | 95.6 |
| Performance Sedan | 350 | 5,200 | 367.0 |
| Classic Muscle Car | 450 | 4,800 | 422.0 |
| Formula Racing Car | 600 | 10,000 | 571.4 |
Torque to HP Conversion Formula
The formula for converting torque to horsepower is:
HP = (Torque × RPM) ÷ 5252Where:
- HP is horsepower
- Torque is measured in pound-feet (lb-ft)
- RPM is the engine speed in revolutions per minute
This equation stems from the definition of horsepower, established by James Watt, as the power needed to lift 550 pounds by one foot in one second.
The constant 5252 is derived from this definition and the conversion between different units of measurement.
HP = (50 lb-ft × 5,000 RPM) ÷ 5252 ≈ 47.6 HPHow do you convert torque to HP?
Converting torque to horsepower involves a few straightforward steps:
- Measure torque: Determine the engine’s torque output, typically in lb-ft.
- Note the RPM: Record the engine speed at which the torque is measured.
- Apply the formula: Use the equation HP = (Torque × RPM) ÷ 5252.
- Calculate: Multiply torque by RPM, then divide by 5252.
A car engine producing 200 lb-ft of torque at 3,500 RPM:
HP = (200 lb-ft × 3,500 RPM) ÷ 5252 ≈ 133.3 HPThe engine generates about 133.3 horsepower at 3,500 RPM.
What is Torque?
Torque is a measure of the rotational force that causes an object to rotate around an axis. In engines, it represents the twisting force applied to the crankshaft. Torque is crucial for tasks requiring significant force, such as accelerating from a stop or climbing hills.
- Measured in pound-feet (lb-ft) or Newton-meters (Nm)
- Indicates an engine’s ability to perform work
- Typically higher at lower RPMs in internal combustion engines
What is HP?
Horsepower (HP) is a unit of power that quantifies the rate at which work is performed. It combines torque and rotational speed to provide a comprehensive measure of an engine’s capability. HP is essential for understanding an engine’s overall performance, especially at higher speeds.
- Derived from torque and RPM
- Measures the engine’s ability to maintain performance
- Often peaks at higher RPMs than torque
Sources / Reference URLs
- NASA Glenn Research Center – Torque and Horsepower
- SAE International – Engine Testing and Instrumentation
Related Tools:
