WiringCalcs.com provides free, no-signup electrical calculators designed to help electricians, contractors, engineers, and DIY enthusiasts perform accurate electrical calculations for any project. With 28 calculators across 4 categories — from wire sizing and voltage drop to conduit fill and load calculations — we cover the tools professionals and homeowners actually need, without the clutter.
Our mission is simple: give people accurate, fast, and free electrical calculation tools with no barriers. There are no accounts to create, no paywalls to hit, and no personal data to hand over. You open a calculator, enter your values, and get your answer. That's it.
Every calculator on WiringCalcs uses standard electrical engineering formulas based on NEC (National Electrical Code) standards and industry-accepted practices. We build each tool with care for both accuracy and speed, so the math runs entirely in your browser with instant results.
Whether you're sizing wire for a new circuit, calculating conduit fill for a commercial pull, figuring voltage drop on a long run, or estimating electrical load for a service upgrade, WiringCalcs is here to help. We always recommend verifying calculations with local codes and consulting a licensed electrician for your specific installation.
Free, fast, and built for everyone who works with electrical systems.