About Elec Motor Calculator Pro
Motor Calculator – Motor Current & Cable Sizing Motor Calculator is an easy-to-use electrical engineering application designed to calculate motor current and determine suitable cable sizes for single-phase and three-phase...
Motor Calculator – Motor Current & Cable Sizing
Motor Calculator is an easy-to-use electrical engineering application designed to calculate motor current and determine suitable cable sizes for single-phase and three-phase electric motors.
Whether you're an electrical engineer, electrician, maintenance technician, or engineering student, this app helps you perform essential motor calculations quickly and efficiently.
KEY FEATURES
✓ Single-Phase Motor Current Calculation
Calculate the operating current of single-phase motors using the standard electrical formula:
I = P / (V × PF × Efficiency)
✓ Three-Phase Motor Current Calculation
Determine three-phase motor current using:
I = P / (√3 × V × PF × Efficiency)
✓ Flexible Motor Power Input
Enter motor power in either:
Kilowatts (kW)
Horsepower (HP)
The app handles the required power conversions automatically.
✓ Adjustable Motor Parameters
Improve calculation accuracy by entering:
Supply voltage
Motor power factor
Motor efficiency
Rated motor power
✓ Intelligent Three-Phase Cable Selection
Select an appropriate cable size based on motor specifications and installation conditions.
The cable sizing feature considers:
Calculated motor current
125% motor sizing multiplier
Copper and aluminium conductors
PVC and XLPE insulation
Above-ground and underground installation
Ambient air and soil temperatures
Underground burial depth
Cable run length
Allowable voltage-drop percentage
✓ Automatic Cable Size Optimization
When the initial cable size produces a voltage drop above the selected limit, the application evaluates larger cable sizes and identifies a suitable alternative.
✓ Comprehensive Calculation Results
Access detailed engineering results, including:
Motor full-load current
Motor design current
Total cable derating factor
Minimum required cable ampacity
Recommended cable cross-sectional area (mm²)
Calculated voltage drop (V)
Voltage drop as a percentage (%)
✓ Built-In Formula Reference
The Show Formula feature provides explanations of the calculation equations, electrical symbols, and power-unit conversions.
It is particularly useful for students, electricians, and professionals who want to understand the calculations behind the results.
✓ Customizable Cable Settings
Configure cable calculations according to your installation requirements:
Conductor: Copper or Aluminium
Insulation: PVC or XLPE
Installation: Air or Underground
✓ Smart Input Validation
The app detects missing, incorrect, or unsupported input values and displays clear messages to help prevent calculation errors.
WHY CHOOSE MOTOR CALCULATOR?
Fast Calculations: Calculate motor current within seconds.
Simple Interface: Navigate easily through a clean, professional design.
Cable Sizing Assistance: Estimate suitable three-phase motor cable sizes.
Voltage-Drop Analysis: Evaluate cable performance over different distances.
Flexible Settings: Adjust motor and installation parameters.
Practical Engineering Tool: Useful for electrical maintenance, troubleshooting, education, and preliminary electrical design.
All-in-One Solution: Combine motor current calculations and cable sizing in one application.
IMPORTANT ENGINEERING DISCLAIMER
Motor Calculator provides preliminary engineering calculations and cable sizing recommendations for reference purposes.
Final cable selection must comply with applicable electrical standards, local regulations, and project specifications.
Before installing a cable, qualified personnel should verify additional factors, including:
Motor starting current and starting voltage drop
Overload and short-circuit protection
Cable short-circuit withstand capability
Cable grouping and installation derating
Soil thermal resistivity and environmental conditions
Motor Calculator is an engineering assistance tool and should not be considered a substitute for detailed electrical design, professional verification, or approval by a qualified electrical engineer.
Previous Versions
Here you can find the changelog of Elec Motor Calculator Pro since it was posted on our website on 2019-08-13 16:39:59.
The latest version is and it was updated on 2026-10-12 15:35:35. See below the changes in each version.
Elec Motor Calculator Pro version
Updated At: 2026-10-09
Elec Motor Calculator Pro version 3.0.3
Updated At: 2020-11-11
Changes: Two minutes electricity blog added
Elec Motor Calculator Pro version 3.0.0
Updated At: 2019-08-21
Changes: Our Youtube electrical channel added
Electrical Quiz section added
Elec Motor Calculator Pro version 2.0.3
Updated At: 2019-07-22
Changes: Added new electrical videos to video section
