The LRFIX Horsepower Calculator calculates horsepower using torque and RPM values to estimate engine performance.

Horsepower Calculator

Understand the Key Terms

  • Torque (lb-ft): This is the rotational force applied by the engine or motor.
  • RPM (Revolutions Per Minute): This measures the speed at which the engine or motor is spinning.

Use the Horsepower Formula

The formula to calculate horsepower is:

HP = (Torque (lb-ft) × RPM) / 5252

  • Torque (lb-ft): Rotational force in pound-feet.
  • RPM: Revolutions per minute.
  • 5252: A constant used to convert the product of torque and RPM into horsepower.

Perform the Calculation

  1. Obtain the torque value in pound-feet (lb-ft).
  2. Obtain the RPM value at which the torque is measured.
  3. Multiply the torque by the RPM value.
  4. Divide the result by 5252 to get the horsepower.

Example Calculation

If an engine produces 400 lb-ft of torque at 3000 RPM:

  1. Multiply torque by RPM:400 lb-ft × 3000 RPM = 1,200,000
  2. Divide by 5252:1,200,000 / 5252 ≈ 228.8 HP

Therefore, the engine’s horsepower is approximately 228.8 HP.

Interpreting the Results

  • Higher Torque at Lower RPM: Indicates strong performance at lower speeds, ideal for tasks like towing.
  • Higher RPM with Moderate Torque: Suggests high-speed performance, suitable for applications like racing.

Understanding the relationship between torque and RPM helps you evaluate engine performance and its suitability for different applications.