Age Calculator
Find your exact age and a countdown to your next birthday.
An age calculator is a tool that works out exactly how old someone is from their date of birth, down to the day. This one shows your age in years, months and days, plus your total age in months, weeks, days, hours, minutes and live seconds, the weekday you were born and a countdown to your next birthday. Works for any date — past or future. Runs fully in your browser — your date of birth is never uploaded.
How to use Age Calculator
Open the tool
Launch this free online age calculator to instantly answer how old am I from any date of birth, all calculated privately in your browser.
Pick your birth date
Use the friendly Day, Month and Year dropdowns to select your date of birth, with year picking made easy for finding any past birthday quickly.
Read your exact age
See your precise age in years, months and days the moment your birth date is complete, calendar-accurate across leap years and varying month lengths.
Explore the totals
Scan your age expressed as total months, weeks, days, hours, minutes and live ticking seconds for a full breakdown of how long you have been alive.
Set an age-at date
Fill in the age at date field to calculate exactly how old you were, or will be, on any chosen past or future day instead of today.
Check your birthday
View the live countdown to your next birthday, the exact date you will turn, and the weekday you were originally born on.
Frequently asked questions
How do I calculate my age from my date of birth?
Enter your date of birth and the calculator instantly shows your exact age in years, months and days, along with totals in months, weeks, days, hours, minutes and seconds. By default it measures up to today; change the “age at” date to calculate your age on any other day.
How is my exact age calculated?
We count the full calendar years from your birth date to the target date, then the leftover months and days — accounting for different month lengths and leap years, the same way you'd say “25 years, 3 months and 12 days”.
How many days old am I?
The calculator shows your total age in days (and in weeks, hours, minutes and seconds) right alongside the years/months/days figure. It's the precise number of days you've been alive, counting leap days, updated live when the target date is today.
Why do the seconds keep changing?
When the “age at” date is today, the totals are measured to the current moment and tick live every second. Set a specific “age at” date to freeze them.
Can I find my age on a past or future date?
Yes. Fill in the “age at date” field with any date and the calculator shows how old you were (or will be) on that day.
What about a 29 February birthday?
In non-leap years the next-birthday date falls back to 1 March, which is the common convention. Your exact age and totals stay accurate either way.
Is my date of birth uploaded anywhere?
No. Everything is calculated in your browser with JavaScript — your date of birth never leaves your device.
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