Quick answer: Enter a date of birth to get an exact age in years, months and days. For example, 15 June 1990 to 10 November 2026 is 36 years, 4 months and 26 days. Change the "Age at" date to check any other day. Nothing is stored.
How to use the Age Calculator
- Pick the date of birth.
- Leave "Age at" as today, or choose another date to see the age on that day.
- Read the age, the totals and the countdown to the next birthday.
How the age is worked out
The calculator subtracts the date of birth from the "Age at" date in whole years first, then months, then days. When the day of the month is earlier than the birth day, it borrows the days of the previous month, the same way you would do it on paper. For example, from 15 June 1990 to 10 November 2026 the age is 36 years, 4 months and 26 days.
Age on another date
Change the "Age at" date to find the age on any day in the past or future. This helps with school cut-off dates, eligibility rules, insurance forms, event entry limits and pension or retirement planning, where what matters is the age on one particular day rather than today.
Born on 29 February
People born on a leap day have a birthday only every four years. In non-leap years, this calculator counts the next birthday as 1 March. That is a common convention, and it is how the law treats it in some countries, but others use 28 February. If a legal decision depends on it, check the rule that applies where you are.
Total days, weeks and months
Besides the age in years, months and days, the calculator shows the total number of months, weeks and days between the two dates. It also shows the weekday you were born on and how many days are left until your next birthday. Counts use calendar dates only, with no time of day or time zone, so the result can differ by a day from a calculation that uses exact birth times.
Age systems differ around the world
This tool uses the international system, where you turn one year older on each birthday. Some countries have traditionally counted age differently. South Korea, for example, moved official use to the international system in 2023. For official forms, follow the rule of the organization that asks for your age.
Privacy
The calculation happens in your browser. The dates you enter are not uploaded, saved or shared, so FormatVolt never receives your date of birth.
Frequently asked questions
How do I calculate my exact age?
Enter your date of birth. The calculator shows your age in years, months and days as of today, or as of any "Age at" date you choose.
Can I find my age on a past or future date?
Yes. Change the "Age at" date to any date, and the age on that day is calculated.
When is the birthday of someone born on 29 February?
In non-leap years this calculator counts the birthday as 1 March. Some places use 28 February, so check local rules for legal purposes.
Does the age calculator use my time zone or birth time?
No. It uses calendar dates only, so a result can differ by a day from a calculation that uses exact times.
Is my date of birth stored or uploaded?
No. The calculation runs in your browser and nothing is saved or sent anywhere.
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Last updated: November 10, 2026