About
About Electrical Calcs
Free, code-accurate electrical calculators for the people who actually wire the world — grounded in the 2023 NEC, with the formula shown every time. Built for the electrician doing a fast field check and the homeowner planning a project alike.
Every formula shown, and checked in code against the 2023 NEC before it ships.
Why we exist
Built for accuracy, not your email address
Most electrical calculators want something before they'll help you — your contact details, or your faith in a formula they won't show. We built the opposite.
Most calculators
- Lock the answer behind a lead-capture form
- Run stale formulas from an old code cycle
- Hide the math inside a black box
- Bury the tool under ads and upsells
Electrical Calcs
- Free and instant — no email, no account, ever
- Grounded in the current 2023 NEC, cited by article
- Every formula shown right on the page
- No ads, no paywall, no lead-gen
Built for the electrician running a field check and the homeowner planning a project alike — plain-language where it helps, technical where it counts.
Our method
How every calculator is built and checked
No tool goes live until it clears the same four gates. This is what "accurate" actually means here.
Step 01
Grounded in the 2023 NEC
Every tool follows the National Electrical Code (NFPA 70), and each result names the exact article it's based on.
Step 02
The formula is shown
No black boxes. Each calculator displays the equation it runs and a worked example, so you can check the result yourself.
Step 03
Verified in code
Every worked example is checked in code against its NEC reference before the tool is published — a wrong number is a safety failure, not a bug.
Step 04
Reviewed by a licensed pro
Before a tool carries our verified mark, a licensed electrician reviews it against the code — so it matches how the work is actually done.
Expert review
Checked by a licensed electrician
Code accuracy isn't something you can crowdsource. Before a calculator carries our verified mark, a licensed electrician reviews it against the NEC — and re-checks it when the code changes.
- Reviewed against the code. Each tool's formulas and worked examples are checked against their NEC articles before publication.
- Re-checked on code cycles. When a new edition changes a rule, the affected tools are reviewed again and dated.
- Field-accountable. Review is done by someone who does the work — so the tool matches how it's actually installed and inspected.
Artie has taught physics and electrical theory for over a decade and consulted on real-world electrical design — so every tool here is grounded in both the theory and the field.
University physics lecturer·Consulted on commercial electrical systems·Last reviewed Jul 2026
Sources & scope
Where the numbers come from
We build on primary sources, not other people's blog posts. Here's what's behind the results — and what these tools are, and aren't, for.
2023 National Electrical Code (NFPA 70)
The code of record for all sizing, load, conduit, breaker, and conversion tools — cited by article on each page.
NREL PVWatts & NSRDB
Peak sun-hour and production data behind the Solar Panel calculator, from the U.S. National Renewable Energy Laboratory.
Standard industry values
Typical appliance running/surge wattages, conductor properties, and equipment ratings — clearly labeled and editable to your nameplates.
Get started
Start with a calculator
Eleven free tools, every one grounded in the code and showing its math. Browse the full set, or reach out if something's off — accuracy reports are always welcome.