This age in days calculator shows how many days have passed from your date of birth to today. Enter your birth date to see the exact number of days you have lived, plus how many full weeks and months that is. Free, right in your browser.
How to find how many days you have lived
- Enter your date of birth in the field above.
- Press “Run” or the Enter key.
- See the number of days you have lived, and next to it how many weeks and your approximate age in years.
How the number of days is calculated
The calculator takes your date of birth and today's date in your device's local time and counts how many full days lie between them.
It uses the real calendar, including leap years and February 29, so the number of days you have lived is exact, with no rounding.
You don't need to enter today's date — it is detected automatically.
Why count your age in days
To celebrate a round number — your 10,000th or 15,000th day — throw an unusual birthday, or simply out of curiosity.
To measure a baby's age in days and weeks, as is common in the first months of life.
To measure how many days have passed since any important event, by entering its date instead of a birthday.
Age in days FAQ
How do I work out how many days I have lived?
Enter your date of birth in the field above and press “Run”. The calculator shows the exact number of days from birth to today.
Does it account for leap years?
Yes. It uses the real calendar, including February 29, so the number of days you have lived is exact.
How many days are counted in a year?
A normal year has 365 days and a leap year 366. The calculator works out which years between the dates were leap years.
Can I see my age in weeks?
Yes. Next to the number of days, the calculator shows how many full weeks that is.
Roughly how many days are in 30 years?
About 10,957 days, allowing for leap years. The exact number depends on the date of birth — the calculator works it out for you.
Is it free?
Yes, the calculator is completely free and works without any sign-up.
Is my date of birth stored?
No. Every calculation runs directly in your browser on your device — the date is never sent anywhere.
Does it work on mobile?
Yes, the page works the same on phones, tablets and computers.