Main breakdown
- Exact age--
- Decimal years--
- Decimal months--
- Days lived--
Age calculator
Work out your exact age in years, months and days, total days lived and the countdown to your next birthday.
Exact age
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Age as of today
Next birthday
- Date--
- Countdown--
How we work out your exact age
The calculator takes your birth date and compares it with the reference date (today by default). We apply the Gregorian calendar: first we count the full years, then the remaining months and finally the remaining days.
We also convert the result into decimals. Decimal years use an average year length of 365.2425 days; decimal months add the years multiplied by 12 and divide the remaining days by 30.44. You will also see the total number of days you have lived and when your next birthday will take place.
By entering a different reference date you can check how old you will be at a specific point in time, for instance ahead of a trip or event.
Why can my age differ from other websites?
Some tools approximate months as 30 days. We work with calendar months and days, which avoids discrepancies when months have 28, 30 or 31 days.
What if I was born on 29 February?
In non-leap years we use 28 February as the next birthday. The year, month and day breakdown still respects the actual length of each month.
How do decimal years and months work?
We apply an average year of 365.2425 days and an average month of 30.44 days to express the elapsed time in decimals while keeping it aligned with the real calendar.
Can I check my age on a past or future date?
Yes. Click “Use another reference date” and enter the exact day. The breakdown, countdown and total days lived are recalculated against that reference.
Do you save or send the dates I enter?
No. All calculations run locally in your browser; the dates are neither stored nor transmitted to the server.
