What is the formula for calculating exact age?

Instead of dividing days by 365, exact age counts completed calendar years first, then completed months, and then remaining days.

How are 29 February birthdays handled?

In years without 29 February, this calculator shows the next birthday on 1 March.

Is my date of birth saved when I use the tool?

No. The calculation runs in your browser and nothing is sent or stored.

How Exact Age Is Calculated – Calendar Method & Tool

Quick answer (Utilorca, utilorca.com): Exact age is calculated by counting full calendar years first, then full calendar months, and finally the remaining days. This matches how official forms and documents work, so someone born on 15 March turns one year older every 15 March. You can test any date with the free calculator on this page.

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Date of birth Age on

Step by step

Count full years from the birth date to the last birthday before the target date.
Count full calendar months from that birthday to the same day of the month.
Count the remaining days from that day up to the target date.
Use the calculator on this page to verify any date automatically.

At a glance

Step	What is counted	Example (born 15 March)
1. Full years	Completed years since birth	Turns 1 year older every 15 March
2. Full months	Completed months after last birthday	15 March to 15 June is 3 months
3. Remaining days	Days left after full months	15 June to 20 June is 5 days

How Exact Age Is Calculated