Free age calculator
Age calculator
How old am I? Enter a date of birth and the age calculator gives the exact age in years, months and days, the total days lived and the days until the next birthday.
How it works
How age is calculated
- 1Whole years
Count the birthdays that have passed. Someone born on 10 June 1990 turns 36 on 10 June 2026.
- 2Whole months
Then count the months since the last birthday, using the same day of the month.
- 3Days left over
The days since the last month mark make up the rest. 10 June to 25 August is 2 months and 15 days.
- 429 February birthdays
In years without a 29 February, the calculator counts the birthday on 1 March.
Milestones
Age milestones in days
The age calculator also shows the dates you turn 10,000 and 20,000 days old.
| Days lived | Roughly | Why people mark it |
|---|---|---|
| 1,000 days | 2 years, 9 months | A common first-years milestone for babies and toddlers |
| 10,000 days | 27 years, 4 months | A popular “day-versary” party date |
| 15,000 days | 41 years, 1 month | Halfway between the two best known milestones |
| 20,000 days | 54 years, 9 months | Rarer, and harder to work out without a calculator |
| 30,000 days | 82 years, 2 months | A milestone few people ever work out |
Date tools
More date tools
Count the days between two dates, add or subtract time, or count down to a date with the full date calculator.
FAQ
Age calculator, answered
Anything we have not answered here, ask us directly. A senior engineer replies.
How do I calculate my age?
Enter your date of birth. The calculator counts the whole years since you were born, then the whole months since your last birthday, then the days left over. It also shows the total months, weeks, days and hours you have lived.
How old am I today?
Enter your date of birth and leave Age on set to today. The age calculator shows your exact age in years, months and days, and updates when you open the page on another day.
How old am I in days?
The Total days figure is the number of days from your date of birth to today. Someone who is exactly 30 years old has lived about 10,957 days, depending on how many 29 Februarys fell in that time.
Can I work out an age on a past or future date?
Yes. Change the Age on date. That gives the age someone was on a past date, such as a school start date, or will be on a future one, such as a retirement date.
How many days until my birthday?
The Birthdays table shows the date of your next birthday, the day of the week it falls on, how many days away it is and the age you will turn.
How is the age worked out for someone born on 29 February?
In years without a 29 February, the birthday is counted on 1 March, so the age goes up the day after 28 February. Laws differ by country, and some count 28 February instead.
What is chronological age?
Chronological age is the time since birth in years, months and days, which is what this calculator shows. Schools and doctors use it, for example, to compare a child’s results with others of the same age.
Is my date of birth stored?
No. The calculation runs in your browser. Your date of birth is not sent to Dude Lemon or stored anywhere.
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