How to calculate your exact age
Updated 23 October 2026
Tool for this guide: Age calculator
Short answer: enter your date of birth in the age calculator. It shows your exact age in years, months and days, the totals in months, weeks, days and hours, the weekday you were born, and how many days until your next birthday.
How age is counted
- Count the whole years since your birth date.
- Count the whole months since your last birthday.
- Count the days left over.
Someone born on 15 January 2000 is 26 years, 9 months and 8 days old on 23 October 2026. Real calendar months are used, not 30-day blocks, which is how forms and official documents count age.
Age on a specific date
Many forms ask for your age on a set date, such as the closing date of a job application, a school starting date or a visa cut-off. Change the Age on date in the calculator to see the age on that day.
Totals
| You want | Shown as |
|---|---|
| Age in months | Total months |
| Age in weeks | Total weeks |
| Age in days | Total days lived |
| Age in hours | Days × 24 |
Leap years
People born on 29 February have a real birthday only every four years. In other years the calculator counts their birthday on 28 February, the usual legal practice in many countries.
Questions
What day of the week was I born?
It's shown under the result, for example "Born on a Saturday".
How many days until my birthday?
The calculator shows it, with the age you'll turn.
Is my date of birth saved?
No. The calculation runs in your browser and nothing is stored or sent.
Try it now
Find your exact age in years, months and days from your date of birth, or the age on any date, plus your total days, weeks and next birthday.
Open age calculator