About ListCalc

One site, every calculator — built fast, explained honestly, and private by design.

Why we built this

Most calculator sites make a simple trade: either they're quick but shallow, or thorough but buried under pop-ups, cookie walls and "unlock full results" prompts. We thought the trade was unnecessary. ListCalc pages load instantly, compute as you type, and then do the thing most tools skip — they show the working: the formula, a worked example, and a field-by-field guide, so you learn something while you calculate.

What makes ListCalc different

• Private by architecture, not by promise. Every calculator is plain JavaScript running in your browser. Your salary, weight, loan size — none of it is transmitted, stored or seen by us. There's nothing to leak because your inputs never leave your device.
• The working, always. Every result comes with the formula it used and a worked example you can check by hand.
• Free and complete. No email gates and no premium wall in front of your own results. An account is optional and does nothing except sync the history you choose to save.
• Honest limits. Where a formula breaks down — BMI for athletes, average rates on variable loans — we say so on the page instead of pretending precision we don't have.

How ListCalc is paid for

ListCalc carries no advertising today, and there is nothing on the site to buy. Running it costs money and time, so advertising is the most likely way it will eventually pay for itself. These are the rules any future ads will follow — written down now, while nothing is at stake, so you can hold us to them later:

• Placed where they stay out of the way. Ads will sit in fixed positions around the content — never between the inputs and the result, never covering your answer, and never shifting the page while you are reading it.
• No pop-ups, interstitials or auto-playing video. There will never be a countdown, an overlay or a dismiss button between you and a number.
• Ads will never see what you type. They will be ordinary display slots with no access to your inputs — the maths still runs entirely in your browser, exactly as described above.
• Nothing is hidden behind them. Every result, formula and worked example stays free and complete whether an ad loads or not.
• Established networks only. Advertising will be served through Google AdSense or comparably reputable networks — never the low-grade resellers behind “one weird trick” boxes — and we will block the ad categories that have no business sitting next to a mortgage figure or a BMI reading.

If an ad ever breaks one of these rules, tell us and we will pull it. A paid ListCalc Premium tier is planned that would remove ads and sync your saved calculations across devices; it is not on sale yet, and the free site will stay whole either way.

What's here today, and what's coming

ListCalc has 249 calculators live across ten categories: finance, health, math, everyday, construction, electrical, business, conversion, gaming and other — plus 78 explainer guides. New calculators ship most weeks; the homepage grid shows everything that's live, and the category hubs break it down by topic.

How it's checked

Calculators use published, citable formulas, and an automated test suite checking results against independently derived values is being rolled out across the site — our methodology page explains the sources, exactly how far that coverage currently extends, and how to report an error. Spotted something off? Please tell us; verified corrections ship fast and are noted on the page.

Who writes ListCalc

Articles and calculator explainers are published under the ListCalc Team byline. ListCalc is built and maintained by Toukir Ahmed, working solo — so rather than invent author personas with borrowed credentials, one name stands behind the site and the methodology page sets out how the numbers are produced and checked. More about the founder →

How an article gets made

1. Numbers before words. Every figure is calculated using the same constants as the calculator it accompanies — the 2026 IRS brackets and standard deduction, the Social Security wage base, concrete bag yields, NEC K-factors, IOM weight-gain ranges. An article can't contradict the tool it sits next to.
2. Working shown. Where a result matters, the formula and the intermediate steps are printed so you can check them rather than trust them.
3. Reviewed when the world moves. Tax tables, rate guidance and clinical recommendations carry dates. When one changes, we update the calculator and every article that cites it.

What we are not

We are not licensed financial advisers, accountants, electricians or clinicians. Money, health and electrical articles are general information and education — our disclaimer sets out exactly where the limits are, and for anything consequential you should speak to a qualified professional.

Spotted an error? Tell us — verified corrections ship fast and are noted on the page.