Age Calculator

The Age Calculator works out your exact age from your date of birth. Enter your date of birth and it shows your age in years, months, and days, so you do not have to count calendar months or leap years by hand.

What Is the Age Calculator?

The Age Calculator compares your date of birth (DOB) with a reference date, usually today, and reports how much time has passed. It gives the result as completed years plus the remaining months and days, which is the format most forms, schools, and official checks ask for. For example, instead of saying only “31”, it says “31 years, 0 months, 0 days” when the birthday has just passed.

Use it when you need an exact age for a form, an eligibility check, a birthday countdown, or the age difference between two dates. You enter a date, the calculator does the calendar arithmetic, and you read the answer.

How to Use the Age Calculator

1. Open the Age Calculator.
2. Enter your date of birth (DOB) in the date field, for example 15 March 1995.
3. If the tool offers a reference date, choose the date you want to measure age as of. Otherwise it uses today.
4. Click Calculate.
5. Read the result: your age in years, months, and days.

Worked Example

Date of birth: 15 March 1995. Reference date: 15 March 2026.

Result: 31 years, 0 months, 0 days. That is 11,323 days in total. One day later, on 16 March 2026, the same person would be 31 years, 0 months, 1 day old.

The breakdown works by counting completed years first (15 March 1995 to 15 March 2026), then counting the remaining months and days after the last birthday. That is why the months and days reset to zero on a birthday.

Leap Year Note

Leap years are included in the calendar count. A leap year adds 29 February, so someone born in February still gets the correct day count across leap and non-leap years. For example, a person born on 29 February 2000 reaches 24 years old on 29 February 2024, the next leap day after their 20th birthday.

Limitations

• The result is only as accurate as the date of birth you enter, so double-check the day, month, and year.
• The calculator uses calendar dates, not the time of birth, so it does not report hours or minutes.
• It does not verify identity or legal age. Official applications may still ask for a birth certificate or ID.
• A date of birth in the future does not give a meaningful age.

Frequently Asked Questions

How is age calculated?

Age is the time between your date of birth and the reference date. The calculator counts completed years first, then the remaining months and days after your most recent birthday.

Does the calculator handle leap years?

Yes. Leap years are part of the calendar, including 29 February, so the day count stays correct across leap and non-leap years.

Can I calculate age as of a past or future date?

Yes, if the tool offers a reference-date field. Enter that date and click Calculate. Otherwise the calculator measures age as of today.

Is my date of birth saved or sent anywhere?

No. The date you enter is used only to compute the result in your browser for this calculation.