Age calculator
Your exact age in years, months and days — plus total weeks, days and hours, the weekday you were born, and a live countdown to your next birthday.
Three rules, no surprises
The same counting method used on official forms and in most legal systems.
Complete months first
A month is complete when the same day number is reached. 15 March to 15 August is five months; 15 March to 14 August is four months and 30 days.
Days left over
After the last complete month, the remaining days are counted. Short months and long months are respected, so the result never needs a rule of thumb.
Leap years included
Real calendar days are counted, so 29 February is included when it happens. A 29 February birthday counts on 28 February in common years.
Common questions
How is the exact age calculated?
The calculator counts complete calendar months from the date of birth, then counts the days left over. It does not divide the number of days by 30 or by 365 — that method drifts by several days over a lifetime.
How are leap years and 29 February handled?
Leap days are included in the day totals. A birthday on 29 February is treated as 29 February in leap years and 28 February in other years, which is the common legal convention. Some families celebrate on 1 March instead; the age itself does not change.
Why might an official age be one year older?
Some countries, including parts of East Asia, add a year at new year rather than on birthdays. Time zones can also move a birth to the next or previous date. For passports, visas and school entry, the date on the birth certificate and local law decide — not this calculator.
Can I calculate age on a future date?
Yes. Change “Age on” to any future date to see the age that will be reached that day. This is useful for visa limits, school cut-off dates, pension ages and closing dates on application forms.
Does the time of birth matter?
Only if you need hours. The tool works with calendar dates, so someone born at 11 pm is treated the same as someone born at 1 am on that date. Subtract one day from the total if you need a strict 24-hour count from the time of birth.