How accurate is the age calculation?

It accounts for leap years, so even people born on February 29 get a precise result.

What does "days until birthday" show?

The number of days from today until your next birthday.

Can I calculate someone else's age?

Yes, just enter their date of birth.

Why does it show 0 months or 0 days?

That means your birthday was very recently (this month or today). If today is your birthday, all three values show 0.

Why use an age calculator instead of subtracting years?

Just subtracting birth year from current year is often off by one — it doesn't account for whether the birthday has happened this year. The calculator handles month and day boundaries plus leap years correctly.

When is exact age in days or months useful?

Pediatric medication dosing, immigration paperwork, milestone birthdays, retirement countdowns, and contests with age cutoffs all need a precise age — not a rounded year.

Age Calculator

Calculators· 14 tools

Free online age calculator. Enter your date of birth and instantly find out your exact age in years, months, days, hours, and minutes. Also calculates days until your next birthday. No signup needed.

Date of Birth

Enter your date of birth to see your age

Frequently Asked Questions

References

ISO 8601 — Date and time representations — International Organization for Standardization

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Frequently Asked Questions

References and sources

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