How does the calculator handle February 29 birthdays?
Choose whether a leap-day birthday is treated as February 28 or March 1 in non-leap years. The exact age and next birthday update immediately.
Age Calculator
Calculate exact age, days lived, next birthday, leap-day birthdays, and useful age milestones from a date of birth.
Exact age from date of birth
Use the Age Calculator to turn a date of birth into an exact age in years, months, and days. It also shows total days lived, weeks lived, hours, minutes, next birthday, age on the next birthday, weekday born, day of year, ISO week, quarter, generation, zodiac sign, and nearby age milestones.
Leap-day birthdays are handled with an explicit rule, so February 29 birthdays can use February 28 or March 1 in non-leap years depending on the convention you need.
What the age calculator includes
- Exact age in years, months, and days for any valid age-on date.
- Total days, weeks, hours, and minutes lived.
- Next birthday countdown and age on the next birthday.
- Weekday born, day of year, ISO week, quarter, zodiac sign, and generation label.
- Nearby milestones such as 10,000 days and major birthdays.
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When to use exact age instead of rounded age
Rounded age is enough for casual conversation, but exact age matters for school forms, eligibility checks, insurance notes, medical intake, sports age groups, retirement planning, birthday content, and legal or administrative workflows. Always verify jurisdiction-specific rules when an age result has legal consequences.
Age calculator FAQ
Can I calculate age on a past or future date?
Yes. Change the age-on date to calculate age for a historical record, upcoming birthday, eligibility date, or future milestone.
Why does exact age show months and days?
Calendar months have different lengths, so exact age is best expressed as complete years, complete months after the last birthday, and remaining days.
