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Torque To Horsepower Converter.

Convert torque to horsepower with explicit density, concentration, or unit-system inputs.

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Mechanical horsepower: 0.000140431505

Mechanical horsepower

0.000000000000

Mechanical power is torque × angular speed. Enter torque in N·m and speed in revolutions per minute; 1 mechanical hp = 745.6998715822702 W.

FAQs

How does the torque to horsepower converter work?

Convert torque to horsepower with explicit density, concentration, or unit-system inputs.

Use Cases

Automotive Performance Tuning

Quickly estimate the horsepower output of an engine based on its torque and RPM, useful for comparing modifications or understanding performance curves.

Example: A car produces 300 lb-ft of torque at 4000 RPM. Horsepower = (300 × 4000) / 5252 ≈ 228 hp.

Electric Motor Sizing

Determine the mechanical horsepower of an electric motor from its torque and speed ratings, helping in equipment selection and power requirement analysis.

Example: A motor with 10 Nm torque at 1500 RPM: (10 × 1500) / 7127 ≈ 2.1 hp.

Frequently Asked Questions

How do I use the Torque to Horsepower Converter?
Enter the torque value (in lb-ft or Nm) and the rotational speed (in RPM) into the respective fields. The calculator will automatically compute the mechanical horsepower using the formula: Horsepower = (Torque × RPM) / 5252 (for lb-ft) or (Torque × RPM) / 7127 (for Nm).
What units does this calculator support?
The calculator supports torque in pound-feet (lb-ft) and Newton-meters (Nm), and rotational speed in revolutions per minute (RPM). It outputs mechanical horsepower (hp).
Why is 5252 used in the formula?
The constant 5252 comes from the relationship between horsepower, torque, and RPM. At 5252 RPM, torque and horsepower are equal in value when torque is measured in lb-ft. This is a standard conversion factor for mechanical horsepower.

Tips & Common Mistakes

Tips

  • Ensure torque and RPM are measured at the same point in the engine's operating range for accurate results.
  • If you have torque in Nm, use the constant 7127; if in lb-ft, use 5252. The calculator handles this automatically.
  • For engines with variable torque, use peak torque and its corresponding RPM to get peak horsepower.
  • Remember that this calculator provides an estimate; actual horsepower may vary due to drivetrain losses and other factors.

Common Mistakes to Avoid

  • Using torque and RPM values from different engine speeds, which gives an inaccurate horsepower figure.
  • Forgetting to convert torque units correctly, leading to incorrect results if you mix lb-ft and Nm without adjusting the formula.
  • Assuming the calculated horsepower is the same as wheel horsepower, ignoring drivetrain losses.

Last updated: August 13, 2026