Age Calculator
Your exact age in years, months and days from your date of birth to any date — plus total days lived and time until your next birthday.
How to use
- 1
Enter your date of birth.
- 2
The target date defaults to today. Change it to a future date to find out how old you'll be, or a past date for historical age questions.
- 3
The result shows your exact age in years, months and days plus useful total counts (days lived, weeks, months) and how long until your next birthday.
Frequently asked questions
Subtract the date of birth from the target date, working in years, months and days separately. If the day-of-month hasn't reached the birth day yet, borrow days from the previous month and reduce the month count by one. The calculator does this calendar math for you.
Because of leap years. Over 25 years there are roughly 6 leap days, so the true day count is about 9,131 instead of the 9,125 you'd get from 25 × 365. The calculator uses the exact calendar difference, not an average.
Yes. The calculator doesn't store your data and doesn't care whose birth date you enter. Use it to plan a child's school start, find an older relative's exact age, or work out how old a historical figure would be today.
Most of the world counts age from birth (Western system). Korea historically counted you as 1 at birth and added a year at every Lunar New Year (so a baby born in December could be 'two years old' by January). Korea moved to the international system in 2023. This calculator uses the international Western definition: years since birth.
Yes. The Date object in JavaScript supports any date the Gregorian calendar covers, including before AD 1. Useful for historical research, ancestry projects, or calculating ages back through family trees.
Related tools
Source: Calendar arithmetic · Last verified 2026-06. This tool provides estimates only and is not legal, tax or financial advice. Always verify your specific situation with the relevant UAE authority or a licensed advisor before taking action.