Motor Control Calculator

Calculate mechanical power, efficiency, gear output, and speed constant for Brushed DC, BLDC, Stepper, and Servo motors.

Motor Parameters

Calculated Outputs

Mechanical Power 157.08W
Electrical Power 24.00W
Efficiency --%
Output Speed (After Gear) 3000.00RPM
Output Torque (After Gear) 0.50N·m
Current at Duty Cycle 2.00A
Angular Velocity 314.16rad/s
Speed Constant Kv 250.00RPM/V

About This Calculator

This motor control calculator computes key performance parameters for DC motors, BLDC motors, stepper motors, and servo motors. Enter your motor specifications to get instant calculations including mechanical power, electrical power, system efficiency, gear-adjusted output, and speed constant.

Core Formulas: Pmech = τ × ω (Mechanical Power) Pelec = V × I (Electrical Power) ω = RPM × 2π / 60 (Angular Velocity) η = Pmech / Pelec × 100% (Efficiency) RPMgear = RPM / Ratio (Output Speed) τgear = τ × Ratio (Output Torque) IPWM = I × Duty% (Current at Duty Cycle) Kv = RPM / V (Speed Constant)

Motor Types:

Brushed DC — Simple, cost-effective motors with mechanical commutation. Widely used in automotive, toys, and small appliances.

BLDC — Brushless DC motors with electronic commutation. Higher efficiency, longer lifespan, used in drones, EVs, and industrial drives.

Stepper — Precise position control via discrete steps. Ideal for 3D printers, CNC machines, and robotics.

Servo — Closed-loop position/speed control with feedback. Used in RC vehicles, automation, and precision positioning systems.

Notes: Efficiency values above 100% indicate that the mechanical power exceeds the electrical input, which is physically impossible—this typically means the torque or speed values are optimistic relative to the electrical input. For accurate efficiency estimates, use measured (not nameplate) torque and current values.