About VoltCalc

VoltCalc is a growing collection of electrical and electronics calculators for electricians, technicians, electronics hobbyists and engineering students. Our goal is simple: make the everyday calculations — Ohm's law, voltage drop, cable sizing, resistor and capacitor codes, three-phase power — quick to do and easy to trust.

Every calculator runs entirely in your browser, shows the formula it uses, and never requires an account.

Disclaimer: Results are provided for reference and educational purposes. Electrical work can be dangerous and is governed by local codes and standards (such as the NEC or IEC). Always verify calculations and consult a qualified, licensed professional before carrying out electrical work.

This site is supported by advertising, which keeps the calculators completely free.

Contact

Questions, corrections or feedback? Email us at contact@volt.webtech360.com.