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Voltage Drop Calculator

Instantly and easily calculate voltage drop for any of your electrical projects! This simple-to-use calculator will help you choose the right wire size and dial in your setup for safety and efficiency. Whether you’re working with LED strip lights, power supply systems, or any other electrical installation, this calculator will make your life easier and save you time.

  • Results You Can Trust: Instantly calculate voltage drop and percentage for multiple wire gauges.
  • Easy To Use: Clear inputs and results for fast decisions.
  • Optimize: Avoid excessive voltage drop and ensure system reliability.
  • Share: Create and share custom configurations in seconds.
Voltage Drop Calculator

Voltage Drop Calculator

Input Parameters

Results

Diameter Area Voltage Drop (V) % Voltage Drop
AWG in. mm CMA mm²

Warning: Voltage drop exceeds 5%. Consider using a thicker wire gauge.

Note: Some voltage drop values exceed the input voltage, which is not realistic. Please re-check your parameters.

Shareable Link

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How to Use the Voltage Drop Calculator

Step 1:
Enter the Length between the power supply and the fixture.

  • Choose the unit of measurement: Feet (default) or Meters.
  • Type the value directly into the input box.

Step 2:
Enter the Voltage (Volts) of your system.

  • Ensure the voltage is greater than 0.
  • Typical values might range from 5V to 240V.

Step 3:
Enter the Load Power (Watts).

  • Input the total wattage of all fixtures being powered.
  • Example: For a system with two 48W fixtures, enter 96W.

Step 4:
Review the results in the Results Table:

  • See voltage drop (V) and percentage voltage drop (%) for different wire gauges.
  • Rows in red highlight configurations with voltage drop exceeding 5%, which is not recommended.

Step 5:
Adjust inputs if needed to improve results:

  • Reduce the length, decrease the load power, or select a higher voltage.

Step 6:
Copy the shareable link to save or share your configuration.

  • Use the “Copy” button for quick sharing.

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