Age Calculator
Calculate your exact age from date of birth in years, months and days. Free online age calculator with total days, weeks and next birthday countdown.
What next?
About the Age Calculator
An age calculator works out your exact age from your date of birth, in years, months and days. It also shows your age as total months, weeks and days, the weekday you were born on and a countdown to your next birthday. Leave the target date empty to use today, or pick any past or future date to find out how old someone was or will be on that day.
Counting age correctly is trickier than subtracting years, because months have different lengths. The calculator first counts complete years, then complete months, and finally the remaining days using the actual length of each month, so leap years and 30- and 31-day months are handled correctly. For people born on 29 February, the birthday is counted on 28 February in non-leap years.
It is useful for forms that ask for age on a specific date, eligibility checks for school, sports, retirement or visas, a child’s chronological age for school reports and tests, or simply finding out how many days old you are. Your date of birth is never sent anywhere.
When to use it
- Finding your exact age on the deadline date of an application form
- Checking school entry, sports category or retirement age cut-offs
- Calculating a child’s chronological age in years, months and days
- Counting the days until your next birthday or a milestone like 10,000 days
Worked examples
Born 15 March 1990, age on 12 October 2026
36 years, 6 months and 27 days — 13,360 days in total, or 1,908 weeks and 4 days.
Leap-day birthday
Someone born on 29 February 2000 turns 25 on 28 February 2025 in this calculator, because 2025 has no 29 February.
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Part of the toolkit
How to use Age Calculator
- 1Enter your date of birth
- 2Optionally pick an 'age at' date to find how old someone was or will be on a specific day — leave it empty to use today
- 3Click Calculate age to see your exact age in years, months and days, plus total months, weeks, days, the weekday you were born and a countdown to your next birthday
Frequently asked questions
How is exact age calculated?▾
Complete years and months are counted between the date of birth and the target date, and leftover days are counted using the real length of each calendar month, so leap years and 28/30/31-day months are handled correctly.
What is chronological age?▾
Chronological age is the time elapsed since birth, written as years;months;days (for example 7;4;12). It is used by teachers, speech-language pathologists and psychologists for scoring standardized tests.
How old will I be on a specific date?▾
Fill in the 'Age at date' field with any past or future date. The calculator shows your exact age on that day.
How many days old am I?▾
After you click Calculate age, the Total days box shows the exact number of days between your birth date and today (or your chosen date).
When is the birthday of someone born on February 29?▾
In non-leap years this calculator counts the birthday on February 28. Some countries legally use March 1 instead.
Is my date of birth stored?▾
No. The calculation runs entirely in your browser and nothing you type is sent anywhere.
Embed Age Calculator on your website▾
Paste this snippet into your page. The embedded tool runs in your visitor's browser and shows a small “Powered by clkr.work” link.