How is exact age calculated?

Exact age is counted as full years, then the remaining full months, and finally the individual days. For example, date of birth 15.3.1990 and today 21.5.2026 gives 36 years, 2 months and 6 days.

What day of the week was I born on?

The age calculator shows the weekday your date of birth falls on. Enter your date of birth in the field and the result appears automatically.

How many days have I been alive?

The calculator works out the exact number of days from your date of birth to today. For example, a 36-year-old has been alive about 13 149 days, with leap years taken into account.

Can I calculate age for a future date?

Yes. Enter your date of birth and the comparison date you want, and the calculator gives the exact age in years, months and days for a future date as well.

Age Calculator

Name: Age Calculator
Author: Miikka

Calculate your exact age in years, months, weeks and days. Enter your date of birth and see how old you are right now.

By Miikka · CalcBrew · Updated Oct 14, 2026

Date of birth

The Age Calculator tells you your exact age from your date of birth in years, months, and days. It also shows precisely how long you have lived and how many days remain until your next birthday.

How the calculator works and what it’s for▾

How age is calculated

The calculator compares your birth date with a chosen date, today by default, and works out the time between them. The result is broken down into full years plus the remaining months and days.

Because the calculation accounts for leap years and the differing lengths of months, the result is your true calendar age rather than a rough estimate.

What you enter and what you get

You enter your date of birth and, if you like, a comparison date. The calculator shows your age in years and, more precisely, the total number of days.

It often also displays how many days are left until your next birthday.

What it is used for

The Age Calculator is handy for filling in forms, celebrating milestones, and any time you want your exact age down to the day.

You can also use it to work out someone else's age, for example ahead of a special occasion.

Good to know

How age is expressed can vary between countries and contexts, but this calculator gives your calendar age clearly broken down.

The total number of days is a nice way to picture the time you have lived in a way a single year figure cannot.

🔄 Reviewed June 2026

Frequently asked questions

Cite this calculator

APACalcBrew. (2026). Age Calculator. https://calcbrew.com/age-calculator

MLA“Age Calculator.” CalcBrew, 2026, calcbrew.com/age-calculator.

Link to https://calcbrew.com/age-calculator. Results are estimates; cite the underlying formula or data source for academic work.