BLDC Motor Power Calculator

This calculator helps you determine the power requirements of a BLDC motor by calculating power based on voltage, current, and efficiency parameters.

Input Parameters

Calculation Results

Calculation Formula

Power (P) = (Voltage × Current) × (1 - Efficiency/100)

Where:
P = Power in Watts
Voltage = Supply voltage in Volts
Current = Motor current in Amperes
Efficiency = Motor efficiency percentage

Calculated Power:

--

Watts (W)

Power in Kilowatts:

--

Kilowatts (kW)

BLDC Motor Power Calculator Calculator Usage Guide

Learn how to use the BLDC Motor Power Calculator and its working principles

How to Use the Calculator

  1. Enter the supply voltage of your BLDC motor in Volts (V)
  2. Enter the operating current of your motor in Amperes (A)
  3. Enter the motor efficiency as a percentage (%)
  4. Click the "Calculate" button to compute the power requirements
  5. View the results in both Watts (W) and Kilowatts (kW)

Understanding the Formula

The calculator uses the following formula to determine the power:

Power (P) = (Voltage × Current) × (1 - Efficiency/100)

This formula accounts for the electrical power consumed by the motor while factoring in efficiency losses during operation.

Applications

This calculator is useful for:

  • Designing power supplies for BLDC motors
  • Ensuring proper component sizing for motor control systems
  • Comparing efficiency between different motor models
  • Planning battery requirements for portable applications

Example Calculation

If you have a BLDC motor operating at 12V with a current draw of 5A and an efficiency of 85%:

Power = (12 × 5) × (1 - 85/100) = 60 × 0.15 = 9.0W

This means the motor consumes 9.0W of power during operation.