How to use the Voltage Drop Calculator (with examples)
By the Super Simple Digital Tools Team · Updated June 2026
Whether it's for work, study or everyday life, the Voltage Drop Calculator takes the hassle out of everyday calculations. Calculate voltage drop, drop percentage and voltage at the load for copper or aluminium wire by gauge, current, phase and run length. Free, instant, no signup.
Using it takes seconds: fill in the fields with your numbers, then press Calculate to run the voltage drop calculator, then copy the result or try a related tool next.
Instant results — Enter your figures and the voltage drop calculator returns an answer in seconds.
Ready to try it? Open the Voltage Drop Calculator and get your answer in seconds.
- Instant results: Enter your figures and the voltage drop calculator returns an answer in seconds.
- Free & private: Runs in your browser — no signup, and nothing is sent to a server.
- Accurate: Uses standard formulas so you can rely on the numbers.