Built for people who have to justify the number
An electrical calculation is rarely just for you. It goes on a permit application, into a load schedule, or in front of an inspector. That is why every tool on AmpCalcs states the formula it used, names the code article it follows, and shows the intermediate values instead of only the final answer.
What is here
- Design and sizing — voltage drop, conductor sizing, ampacity, transformer sizing and service load.
- Raceway and enclosure — conduit fill and box fill to Chapter 9 and Article 314.
- Power and conversion — kVA, kW, amps, power factor and correction capacitor sizing.
- Electronics — Ohm’s law, power, resistor colour codes and battery runtime.
Everything runs in your browser. Nothing is uploaded, there is no account, and the calculators keep working offline once the page has loaded.