What this is
Plain Calculators is an independent collection of free online calculators for everyday math, money, time, school, and health. Every tool is built to do one job well: take the numbers you already have and hand back a clear, correct answer without fuss.
How it works
Each calculator runs entirely in your web browser using plain JavaScript. When you type your numbers, the math happens on your own device — nothing is uploaded to a server, saved to an account, or shared with anyone. There is no sign-up, no login, and no paywall.
Why it looks like a newspaper
We wanted the opposite of a cluttered, pop-up-ridden calculator site. The broadsheet layout — a masthead, ruled columns, and a plain typographic voice — is a deliberate nod to the reference desks and almanacs people once trusted for straight figures. The balance scale in the masthead stands for what these tools do: weighing values until they settle into an answer.
What’s on the desk
Today the desk includes the Average Calculator, Hour Calculator, Weighted Grade Calculator, Dividend Calculator, and A1C Calculator. New calculators are added regularly.
A note on accuracy
We work hard to make every formula correct and every result reliable, but the tools are provided for general information only. Please see our Disclaimer for the details and our Privacy Policy for how your information is handled. Questions or corrections are always welcome — get in touch.