Enter RPM and torque values to calculate power output in multiple units.
The RPM to Horsepower Calculator simplifies converting engine speed (RPM) and torque into horsepower (HP) for car engines, electric motors, and industrial machinery. Supporting horsepower (HP), kilowatts (kW), and torque units like Newton-meters (Nm) and pound-foot (lb-ft), this tool ensures accurate power analysis across metric and imperial systems.
Learn how the 5252 constant standardizes RPM-to-HP conversions for engineers, mechanics, and hobbyists optimizing performance and efficiency.
The formula to calculate horsepower from RPM and torque is:
Where:
The constant 5252 comes from unit conversion and represents the relationship between torque, RPM, and horsepower in imperial units. It is derived from the equation:
Here:
This constant ensures the formula remains consistent when working with imperial units like pound-foot and RPM.
Our RPM to Horsepower Calculator simplifies this calculation by supporting multiple unit systems for torque and horsepower. Key features include:
Whether you're working with metric or imperial systems, this calculator allows you to input your preferred units, making it a versatile tool for engineers, mechanics, and hobbyists.
A motor operates at 2500 RPM with a torque of 80 Newton-meters (Nm). What is its horsepower?
Step 1: Convert torque to pound-foot:
1 Nm = 0.73756 lb-ft
So,
Step 2: Calculate horsepower:
An engine generates a torque of 300 lb-ft and rotates at 3600 RPM. What is its horsepower?
Step 1: Use the formula directly:
An electric motor has a torque of 50 Nm and runs at 1500 RPM. What is its power in kilowatts?
Step 1: Convert torque to horsepower:
1 Nm = 0.73756 lb-ft
Step 2: Calculate horsepower:
Step 3: Convert horsepower to kilowatts:
1 HP = 0.7457 kW
Rearrange the formula:
Yes, the formula applies to any system where torque, RPM, and power are related. For electric motors, power can also be expressed in Watts or Kilowatts.
If RPM is zero, the system is at rest, and the horsepower is also zero because power depends on motion.
At 5252 RPM, the formula aligns torque and horsepower because the constant 5252 equates the two values, making their curves intersect.
The RPM to Horsepower Calculator simplifies complex calculations and helps users determine an engine's power output in both metric and imperial units. With support for multiple power and torque units, this tool is invaluable for engineers, mechanics, and enthusiasts working in various industries.
By understanding the relationship between RPM, torque, and horsepower, you can optimize engine performance and improve overall efficiency. Use our calculator to save time and ensure accurate results!