About MyElectricCalculator

What this is

A reference site for people who size electrical work: 26 calculators covering conductor and cable sizing, ampacity and derating, overcurrent protection, residential and EV load calculations, conduit and box fill, conduit bending, generator and transformer sizing, battery banks, power factor correction, and the unit conversions that sit between them.

What separates it from a search result that returns a bare number is that every tool prints its working. Under each answer is the table the answer came out of, a fully worked example with real figures, the mistakes that specific calculation invites, and the questions people actually ask about it. You are meant to be able to check the tool by hand and catch it if it is wrong — and to know which code section to cite when somebody on site disagrees with you.

Who it is for

Electricians and contractors sizing a job, and wanting the code reference to hand rather than a number to defend from memory. Solar and storage installers working between DC capacity and AC service limits. Engineering and trade students, for whom the worked example is the point and the answer is incidental. Facilities and maintenance staff trying to work out whether an existing service will absorb one more machine. And electrically competent homeowners planning a charger or a panel upgrade before talking to a contractor — who should treat every result here as preparation for that conversation, not a substitute for it.

What it will not do

• Ask who you are. There is no account, no sign-up, no newsletter gate and no email box in exchange for a result. Every calculator on the site works on first visit.
• Send your figures anywhere. The arithmetic runs in your browser. The loads, distances and voltages you type are never transmitted, stored or logged, and the site sets no cookies of its own. See the privacy policy, which is short because there is little to describe.
• Hide the method behind a paywall. Every table, worked example and explanation is on the free page. There is no premium tier holding the useful half.
• Pretend to certainty it does not have. Where a figure is a market convention rather than a code requirement, the page says so. Where the underlying tables are provisional — as they are for the metric cable calculator — the page carries a warning that cannot be dismissed.

How it is paid for

At the moment, it is not. The site runs no advertising, no affiliate links, no sponsored placements and no analytics, and it earns nothing.

That may change: advertising is the likeliest way a reference site of this kind covers its hosting. If it does, three things will hold. Advertising will be clearly distinguishable from content. It will never influence a calculated result, a recommended size, or the order in which anything is presented. And the privacy policy will be updated to name the provider and describe what it collects before anything goes live, rather than after. If you are reading a policy that describes no advertising, there is none.

Why it looks like this

The site is built to be read on a phone, in bad light, possibly outdoors, by someone holding something else in their other hand. That drove the whole design: a dark blueprint ground rather than a white page, sections divided by drawn lines instead of floating cards, numerals set in a face with a slashed zero and a disambiguated one and lowercase L, and results shown in a seven-segment readout that reads like an instrument rather than a web page. Touch targets are sized for gloves.

Underneath, the pages are static HTML and ship no tracking scripts, no fonts fetched from a third party and no framework runtime — which is also why the reference tables, worked examples and FAQs stay readable on a weak signal, or if the calculator's script never loads at all.

What it is not

Not affiliated with, endorsed by, or connected to the National Fire Protection Association, the IET, Standards Australia or Standards New Zealand. NEC is a registered trademark of the NFPA. The standards themselves are commercially licensed documents; this site references them and does not reproduce them.

And not a substitute for a licensed electrician, a design engineer, or the current adopted code text in your jurisdiction. These are planning and estimation tools. The limits are set out honestly in the methodology, along with which edition each table follows and what the site does not know about your installation.