⚙️ Power ↔ Torque ↔ RPM Calculator

Convert between power, torque, and RPM for motors and engines - enter any 2 values

Relationship:

Power = Torque × RPM × Constant
Enter any 2 values to calculate the third automatically.

⚡ Power

🔧 Torque

🔄 Speed

Interactive Motor Diagram

Power Torque RPM CALCULATED VALUES

📊 Quick Conversions

1 HP = 0.7457 kW
1 kW = 1.341 HP
1 lb-ft = 1.356 Nm
1 RPM = 0.1047 rad/s

About Power ↔ Torque ↔ RPM Calculator

Calculate the relationship between power, torque, and rotational speed (RPM) for motors, engines, and mechanical systems. Enter any two values to automatically calculate the third.

🎯 Common Applications

  • Motor Selection: Choose the right motor for your application
  • Engine Performance: Understand power and torque curves
  • Gearbox Design: Calculate output torque and speed
  • Drive Systems: Size motors for conveyor belts and machinery
  • Automotive: Compare engine specifications and performance

📐 Formulas Used

Power (kW) Formula:

P = (T × ω) / 1000

P = (T × RPM × 2π) / 60000

Torque (Nm) Formula:

T = (P × 60000) / (RPM × 2π)

T = (P × 9549) / RPM

RPM Formula:

RPM = (P × 9549) / T

Where: P = Power (kW), T = Torque (Nm), ω = Angular velocity (rad/s)

💡 Understanding the Relationship

Power is the rate at which work is done - how fast energy is transferred.

Torque is the rotational force - the "twisting" strength of the motor.

RPM is the speed of rotation - how fast the shaft spins.

Key Insight: High torque at low RPM = strong but slow (like a truck). Low torque at high RPM = weak but fast (like a sports car).

By JV Kit Team
•
Last updated: February 01, 2026