Date Difference Calculator
Find the time between two dates in years, months, days and weekdays, or add and subtract time from a date.
Age Calculator
Enter a date of birth to get your exact age in years, months and days, plus total days lived, the weekday you were born and a countdown to your next birthday.
Use the Age Calculator
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How to use the Age Calculator
- Select the date of birth.
- Leave the “age at” date as today, or choose another date.
- Read your exact age and the totals.
- Check how many days remain until the next birthday.
About this tool
Age is calculated using calendar months and days, borrowing days from the previous month when needed, which matches how people normally state their age. Someone born on 29 February is treated as having their birthday on 28 February in non-leap years.
Free to use. Your inputs are processed in your browser and are not sent to our servers. Results are estimates for general information; see the disclaimer.
How to calculate age from date of birth
Enter a date of birth, and the calculator counts the complete years, then the complete months, then the days left over. For someone born on 15 August 2000, age on 5 November 2026 is 26 years, 2 months and 21 days:
- 15 August 2000 to 15 August 2026 is 26 complete years.
- 15 August 2026 to 15 October 2026 is 2 complete months.
- 15 October 2026 to 5 November 2026 is 21 days.
What the results show
- Exact age in years, months and days.
- Your age in other units: total months, weeks, days and hours.
- The weekday you were born on.
- Your next birthday: the date, how many days away it is and the age you will turn.
Finding age on a specific date
The Age at date field is set to today, but you can change it to any date. That helps when a form asks your age on a particular day rather than today:
- Job applications: many adverts set an age limit, often measured on the closing date. Check the advert for the exact rule.
- School and college admissions: a minimum or maximum age may be set on a cut-off date.
- Exams and competitions: eligibility can depend on age on a set date.
- Insurance and pensions: forms may use your age on the start date of a policy.
Always use the date of birth on your official documents, and confirm how the organisation counts age, as some rules differ slightly.
Leap-year birthdays
If you were born on 29 February, this tool treats your birthday as 28 February in non-leap years. Some organisations use 1 March instead, so check if the exact date matters.
Related date tools
To count the days between any two dates, or to add days and business days to a date, use the Date Difference Calculator.
Frequently asked questions
Can I calculate age on a past or future date?
Yes. Change the “age at” date.
How are leap-year birthdays handled?
The next birthday is shown on 28 February in non-leap years.
Is my date of birth saved?
No. It is processed in your browser only.
How do I calculate my exact age?
Enter your date of birth in the calculator. It counts complete years, then complete months, then the remaining days up to today or any date you choose.
Can I calculate my age on a past or future date?
Yes. Change the Age at date field to any date on or after the date of birth.
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