Age Calculator

Years are counted first, then whole months, then the remaining days — the same way you would say it out loud. Because months have different lengths, this is more accurate than dividing total days by 365.25.

Yes. Day totals use real calendar dates, so every leap day between the two dates is counted.

In non-leap years the birthday is treated as 1 March for the countdown, which is the most common legal convention. The exact age in years still increments correctly.

Yes. The second field accepts any date, so you can measure the distance between any two points — a project start and end, or two anniversaries.

Yes, completely. There is no account to create, no trial that expires, no watermark on the output and no feature held back behind a paywall. The site is supported by unobtrusive advertising, not by charging you.

No. Age Calculator runs entirely inside your browser, so your input never leaves your device. You can confirm this by opening your browser's network tab — there is no upload request.

Yes. Because processing happens locally, there is no copy of your data on any server to leak, subpoena or lose. Nothing is logged and nothing is stored.

Yes. The interface is built mobile-first, with touch-friendly controls and layouts that adapt to small screens. Everything that works on a desktop works on a phone.

Once the page has loaded, yes. All processing is local, so you can carry on working if your connection drops.

Any current version of Chrome, Edge, Firefox, Safari or Opera, on desktop and mobile. If something behaves oddly, updating your browser resolves it in almost every case.

Yes. Whatever you produce here is yours — use it in client work, products, packaging or publications. There is no watermark, no licence to accept and no attribution required.

No. There is nothing to keep: your data is never transmitted, and it is cleared from memory as soon as you close or reload the page.