⚡ Voltage Drop Calculator

Calculate voltage drop, final voltage, and percentage drop in an electrical circuit based on conductor size, length, and load.

🔍 Result

Voltage Drop: V

Final Voltage: V

Voltage Drop (%): %

What Is Voltage Drop?

Voltage drop refers to the reduction in voltage as electric current moves through a conductor, such as a wire or cable. This is a normal occurrence in all electrical circuits but should be kept within safe limits to avoid performance issues or equipment damage.

Why It Matters

Too much voltage drop can cause lights to dim, motors to run inefficiently, or devices to fail. Keeping the drop within acceptable levels ensures your equipment operates safely and efficiently.

How This Calculator Helps

This tool makes it easy to estimate:

  • 🔋 Voltage drop based on wire size, length, and load
  • 🔧 Final voltage available at the end of the cable
  • 📉 Percentage of voltage lost in the circuit

It's useful for planning both residential and commercial wiring projects.

Helpful Tips

  • ✅ Use thicker cables for longer runs to reduce voltage loss
  • ✅ Copper conducts better than aluminum, but may cost more
  • ✅ Keep total voltage drop under 5% for most applications

Whether you're installing lighting, wiring appliances, or setting up a new circuit, this calculator helps you make informed choices about conductor size and material.