Works out an exact age on any date, plus total days lived and how long until the next birthday. Leap days and short months are handled on the calendar rather than by approximation.
Runs entirely in your browser
This tool works out an exact age — in years, months and days — as of any date you choose, not just today. Alongside the precise age it shows the total number of days lived and how long remains until the next birthday, so you get both the formal answer and the fun details in one place.
Getting age right means respecting the calendar. Leap days and months of different lengths are handled on the real calendar rather than by dividing total days by 365.25, which is what makes the result match how a birthday is actually reckoned. That precision matters for forms, eligibility checks and legal thresholds where “how old exactly” has consequences.
It runs in your browser, so a date of birth you enter stays on your device. Set the “as of” date to a point in the past or future to answer questions like how old someone was at an event, or will be on a given day.
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