About SimplyCalculators

SimplyCalculators makes free, fast calculators for everyday questions in the US: pay, loans and savings, grades, home projects, dates and more. Each one gives the answer as soon as the page opens, explains it in plain English and shows the math with your own numbers.

Why we built it

Plenty of everyday decisions come down to a quick piece of math: how much paint to buy, what a loan really costs, how many days are left until a holiday. Many calculator sites bury that answer under pop-ups, sign-ups and slow pages. We want the answer on screen in under a second, with the working shown, so you can trust it and check it.

How we build a calculator

1. Start from the official rule. We read the exact page from the agency or standards body that sets it (for example the IRS, the Social Security Administration or NIST) and link to it on the calculator.
2. Test before we write the page. Each formula is checked against reference values worked out independently, never by our own code, including the edge cases where a rounding rule or a band changes.
3. Compare with other calculators. We run the same inputs on two or three popular calculators. Where answers differ, the official source decides, and we write down why.
4. Have it reviewed. Every page is read by our editor before it goes live. Money and health pages that apply tax rules, lending rules or health categories also need a named, qualified reviewer, shown at the top of the page with the date they signed it off. Pages that are plain arithmetic, such as compound interest, don't.

Who checks the pages

Wayne Bickerton founded SimplyCalculators and is its editor. He checks every page before it goes live: the formula against the official source, the worked examples, the test results and the wording. Pages that apply tax, lending or health rules are also checked by a named, qualified reviewer, shown at the top of the page.

Our standards

• Sources you can open. Every fact links to the exact page it comes from, not a homepage. A list of sources sits at the bottom of each calculator.
• Up-to-date figures. Figures that change, such as tax brackets, contribution limits or average mortgage rates, are stored with their source and the date we checked them. Each one has a review date, and our build stops if any figure goes past it, so an out-of-date number can't stay on the site unnoticed. The date at the top of each calculator shows when it was last updated.
• Questions people really ask. The questions answered on each page come from what people actually search for, not from guesswork.
• Plain English. Short sentences, full names before abbreviations, and one clear rounding rule on every page.
• Fast and private. Pages are small and quick to load, with no sign-ups and nothing to install. The calculators run in your browser, and we don't store what you type; the privacy policy explains what the site does keep.

Spotted a mistake?

Tell us at [email protected] with the page and the numbers you entered. We check every report against the official source, fix confirmed errors and change the page's "updated" date when we do. The contact page lists every way to reach us.

How we pay for it

The site is free and paid for by advertising from Google AdSense and, where we have them, clearly labeled sponsors. Ads never change a result, and they're always labeled and kept apart from the calculator's inputs and answer. No sponsor can buy a review, a ranking or a result.

For information only

Our calculators give estimates to help you plan. They aren't financial, tax, legal or medical advice; for decisions that matter, check with a qualified professional. The terms of use say more.

Who we are

SimplyCalculators is run by ADTECHLAB LTD, a company registered in England and Wales (company number 12578326, VAT number GB377381757). Registered office: 203 West Street, Fareham, Hampshire, England, PO16 0EN. Email: [email protected].