How to use the Age Calculator
- Enter the date of birth.
- Leave the second date as today, or choose another date to see the age on that day.
- Read the exact age, totals and next birthday.
What does this tool do?
The calculator counts whole years, then whole months, then the remaining days — the same way people naturally describe age. It handles leap years and months of different lengths correctly.
People born on February 29 have their birthday counted on February 28 in non-leap years, which is how most legal systems treat it.
Why use it?
- Exact age for forms, visas and eligibility checks.
- Age on a past or future date.
- Fun totals: days, weeks and hours alive.
Use cases
- Check age on an exact cut-off date for school entry, exams, sports categories, visas or job applications.
- Fill in forms that ask for age in years and months.
- Find out how many days old someone is, or how long until their next birthday.
Example
Someone born on June 15, 1995 is 31 years, 3 months and 19 days old on October 4, 2026. That's 11,434 days in total.
Common mistakes
- Subtracting birth year from this year. That's a year too high for anyone who hasn't had their birthday yet this year.
- Using today's date when a form asks for age “as of” a specific date. Change the second date to the cut-off date.
Accuracy and limits
- Ages are calculated from calendar dates; the time of birth isn't included.
Privacy
The calculation happens instantly in your browser. The numbers you enter are not sent to our servers or saved. There's no account to create and nothing to install.
Frequently asked questions
How do I calculate age in Excel?
Use =DATEDIF(birth_date, TODAY(), "Y") for whole years. Add "YM" and "MD" for months and days.
Why do some countries count age differently?
Traditionally, Korea counted everyone as one year old at birth, adding a year each New Year. South Korea officially switched to international age in 2023.
How do I find my age on a specific date?
Change “Age on this date” from today to the date you need — for example an application deadline. The result shows your exact age on that day.
How many days old am I?
The calculator shows total days, weeks and months as well as years. Someone born on 15 June 1995 is 11,440 days old on 10 October 2026.
Last reviewed by the M2Toolkit team.