About the Age Calculator
Tezmy's Age Calculator works out your exact age from your date of birth, down to the day. It also shows how many months, weeks and days you have been alive and counts down to your next birthday, including which day of the week it falls on. You can calculate age on any date, not just today, which is useful for forms, school admissions, visas and eligibility rules. Leap years and months of different lengths are handled correctly, including birthdays on 29 February.
Updated October 2026
How to use the Age Calculator
- 1Pick your date of birth.
- 2Optionally, pick another date to see your age on that day. Leave it empty to use today.
- 3Read your exact age in years, months and days.
- 4See totals and the countdown to your next birthday below.
How age is calculated
Your age is the number of full years since your date of birth, plus the months and days since your last birthday. The calculator counts real calendar months, so it knows that February is shorter and that leap years have 366 days. That's more accurate than dividing days by 365.25, which can be a day out near birthdays.
Along with years, months and days, you'll see your age as total months, weeks and days, and how long until your next birthday, including the day of the week it falls on.
Calculate age on a specific date
Many forms ask for your age on a particular date, not today. Set the second date to find it, for example:
- School admission: a child's age on 1 September or 31 March, depending on the country.
- Exams and jobs: the age on the application closing date for age limits.
- Visas, passports and insurance: age on the travel or policy start date.
- Sports and competitions: age on the cut-off date for an age group.
Birthdays on 29 February
People born on 29 February (leaplings) only have a real birthday every four years. In the other years, this calculator counts the birthday on 28 February, so a full year is added on the last day of February. Laws differ between countries (some use 1 March instead), so for legal deadlines check the rule where you live.
Fun ways to see your age
Seeing your age in days can be surprising: you turn 10,000 days old at about 27 years and 4 months, a milestone some people celebrate. To count the days between any two dates, such as your wedding anniversary or a project deadline, use our Days Between Dates tool. To plan ahead, use the Countdown Timer for the days until the next birthday, or the BMI Calculator when you also want a health figure for the same age.
Features
- Exact age in years, months and days
- Age on any past or future date
- Total months, weeks and days
- Next birthday countdown and weekday
- Correct for leap years and 29 February
- Private: dates never leave your device
Frequently asked questions
How is age calculated?
We count full years since your birth date, then full months since your last birthday, then the remaining days. This is the same way age is counted on official forms.
What if I was born on 29 February?
In years without a 29 February, your birthday is counted on 28 February. Your exact age and totals are still calculated correctly.
Can I calculate age on a specific date?
Yes. Fill in the “Age on this date” box with any date, for example an exam date or application deadline, to see how old you will be on that day.
How many days old am I?
Enter your date of birth and look at the Total days box. It shows the number of days from your birth date to today, or to the date you chose.
Is my date of birth saved?
No. The calculation happens in your browser and nothing is stored or sent anywhere.
How do I calculate my exact age?
Enter your date of birth. The calculator shows your age in years, months and days, updated for today, or for any date you choose.
How many weeks old am I?
Enter your date of birth and look at the total weeks shown below your age. It counts complete weeks since the day you were born.
When is my next birthday?
It's shown under your age, with the number of days to go, the day of the week and the age you'll be turning.