Age Calculator
Calculate exact age in years, months, days, hours, and minutes from a birth date.
Age Calculator
Exact age from birth date.
FAQ
How is the age worked out?
As calendar years, months and days — not as a total divided by 365.25. The tool subtracts the birth date from the reference date field by field and borrows when a field goes negative, which is how people actually count age.
Why not just divide the number of days by 365?
Because that drifts. Months are different lengths and leap years add a day, so a decimal-year approximation disagrees with the calendar by increasing amounts over a lifetime. Counting by calendar fields gives the answer a passport agrees with.
How does it handle someone born on 29 February?
By borrowing from the actual preceding month, whatever length that month had. In a non-leap year the day count borrows 28 days from February and, where that still leaves the day negative, borrows again from January's 31. The result is the conventional treatment: the anniversary falls at the start of March in years without a 29 February.
What if I enter a birth date in the future?
Nothing is returned. A future birth date has no valid age, so the tool declines rather than showing a negative or an absurd number.
Can I calculate age at a past or future date?
Yes — the reference date is an input, not fixed to today. That is what you want when working out how old someone was on a specific date, or how old they will be at an event.
Why does my age in months not match my age in years times twelve?
Because the months figure is the remainder after whole years, not a separate total. Someone aged 30 years and 4 months has lived roughly 364 months, but the tool shows "30 years, 4 months, and some days" — the calendar breakdown rather than a cumulative count.
Does the time of day matter?
No. The calculation works on dates, not timestamps, so it does not attempt to know the hour of birth. For most purposes that is what you want; for anything requiring precision to the hour, a date calculator is the wrong instrument.
Is my date of birth sent anywhere?
No. Everything is calculated in your browser and nothing is stored or transmitted.
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