Motor Torque Calculator — Calculate Torque from Power & Speed

Motor Torque Calculator

Calculate torque from power and speed for electric motors, engines, and mechanical systems. Convert between Nm, lb-ft, kg-cm, and other torque units.

Step 1: Motor Parameters

85%

Torque Calculation Formula

Torque (Nm) = (Power (kW) × 9550) ÷ Speed (RPM)

For HP: Torque (lb-ft) = (Power (HP) × 5252) ÷ Speed (RPM)

Step 2: Units & Options

Common Motor Types

AC Induction: 85-95% efficiency
DC Brushed: 75-85% efficiency
Brushless DC: 85-90% efficiency
Stepper: 70-80% efficiency

Motor Torque Calculation Results

Summary
Unit Conversions
Performance Data

Calculated Torque

63.66 Nm
At 85% efficiency with 10% safety margin
Continuous Torque
63.66 Nm
Starting Torque
70.03 Nm
Motor Power
10 kW
Power at Shaft
8.5 kW

Torque Unit Conversions

Unit Value Conversion Factor Common Applications

Motor Performance Data

Torque Calculation Formulas

Torque (Nm) = (Power (kW) × 9550) ÷ Speed (RPM)

Torque (lb-ft) = (Power (HP) × 5252) ÷ Speed (RPM)
With efficiency: Torque = (Power × Conversion Factor ÷ Speed) × Efficiency
Starting torque is typically 10-30% higher than continuous torque.

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