Age Calculator - Exact Age & Birthday Countdown
Calculate exact age in years, months, and days, see time lived in multiple units, and find the countdown to the next birthday.
CALENDAR AGE TRACKING
Enter your birth date to calculate your calendar age in years, months, and days.
Elapsed hours and minutes are estimates counted from local midnight on your birth date because the tool does not ask for a birth time.
Enter a birth date to get completed years, months, and days, counted as whole calendar months rather than fixed 30-day blocks. The same result is repeated in larger units so you can quote a total in days or weeks.
No birth time is collected, so hour and minute figures are counted from local midnight and can be out by up to a day. A 29 February birth date has no exact anniversary in a common year, and legal, medical, and immigration definitions of age differ from calendar age, so check the rule that applies before relying on this figure.
Worked examples: Someone born on 15 March 1990 is 36 years, 6 months and 25 days old on 10 October 2026 — Someone born on 1 July 1985 is 41 years, 3 months and 9 days old on 10 October 2026. Someone born on 25 December 2010 is 15 years old on 10 October 2026 and turns 16 on 25 December 2026, 76 days later — Someone born on 15 March 1990 has been alive for 13,358 days on 10 October 2026.
Frequently Asked Questions
- How exact is this age calculation?
- Years, months, and days use your local calendar. Hours and minutes are estimates from local midnight on your birth date because no birth time is entered.
- Does it account for leap years?
- Yes. Calendar arithmetic includes leap years. For a February 29 birth date, this calculator uses March 1 as the anniversary in a non-leap year so the age and next-birthday countdown follow one consistent rule.
- Is my birth date stored?
- No, all calculations happen in your browser.
- Why are elapsed hours and minutes estimates?
- The form asks for a birth date but not a birth time, so elapsed hours and minutes are counted from local midnight on that date.
- How do I calculate my exact age in days?
- Count the days from your birth date to today, or enter your birth date above and read the total days in the results. Someone born on 15 March 1990 has lived 13,358 days on 10 October 2026.
- How many days until my next birthday?
- Enter your birth date and read the next-birthday countdown in the results. For example, on 10 October 2026 someone born on 25 December 2010 has 76 days until their 16th birthday.