Math
Age Calculator
Your exact age in years, months, and days — plus how long until your next birthday.
Your age
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Enter your date of birth
Total days lived
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Total weeks
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Next birthday
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Frequently asked questions
How is my exact age calculated?
By counting the full years, months, and remaining days between your date of birth and today (or any date you choose), accounting for different month lengths and leap years.
Why do I need this instead of just subtracting years?
Subtracting birth year from the current year gives the wrong answer before your birthday has passed this year — this calculator accounts for the exact month and day, not just the year.
Can I calculate my age on a future or past date?
Yes — change the "As of" date to see your age on any specific date, past or future, which is useful for eligibility cutoffs or planning ahead.
How many days until my next birthday?
The calculator shows this automatically once you enter your date of birth, alongside your total days and weeks lived.