This is a free and easy-to-use cable size calculator for electricians and students. Enter load, voltage, length, and material to get the correct wire size instantly.
Cable Size Calculator
🔧 How to Use This Cable Size Calculator
- Enter the Load Current (in Amps)
This is the current your device or circuit draws under normal operation. - Input the System Voltage (in Volts)
Choose the operating voltage of your system (e.g., 230V, 415V). - Enter Cable Length (in meters)
Specify the one-way length of the cable from the source to the load. - Select Phase Type
Choose between Single Phase or Three Phase based on your system. - Choose Conductor Material
Select Copper or Aluminum depending on your cable material. - Input the Maximum Allowable Voltage Drop (in Volts)
Common limits are 3% to 5% of system voltage (e.g., ~6.9V for 230V). - Click “Calculate”
The tool will display the recommended cable size in mm² and the calculated voltage drop.
Note: This calculator is for general guidance only. Please follow local electrical codes (e.g., IS 732 or NEC) and consult with a licensed electrician for final sizing. This tool does not apply derating for ambient temperature, grouping, or soil thermal resistivity.
