Passport & visa forms
Many forms ask for age on a specific date or require you to be at least X years old when you travel.
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Age Calculator
Find your exact age in years, months, days, weeks, hours and minutes. See what day of the week you were born and your zodiac sign.
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Your age
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Enter your date of birth to see your exact age.
How Age is Calculated
Age is the difference between two dates: your date of birth, and the reference date (today by default). The calculator gives you that difference in several useful units.
Years, months and days
This is the natural way people describe age. It counts whole years first, then whole months, then the remaining days. Someone born on 15 March 1990 on 20 June 2025 would be 35 years, 3 months and 5 days old.
Total months, weeks, days, hours, minutes and seconds
These are the raw totals. Total days is the exact number of days you have been alive. Hours, minutes and seconds extend the same count down to finer units.
Leap years
Every four years (with a few exceptions) February has 29 days. The calculator accounts for this automatically. Someone born on 29 February is treated as having a birthday on 28 February in non-leap years for the purpose of day counting.
Zodiac sign
The calculator shows your Western zodiac sign based on your birth date. Signs run from Capricorn (late December) through to Sagittarius (late November). Chinese zodiac, Vedic astrology and other systems are not included.
Day of the week
Each calendar date falls on a fixed day of the week. The calculator shows which one you were born on — for example, 1 January 2000 was a Saturday.
Notable Dates
| Born on | Zodiac | Day of week |
|---|---|---|
| 1 January 2000 | Capricorn | Saturday |
| 15 June 1990 | Gemini | Friday |
| 29 February 2000 | Pisces | Tuesday |
| 4 July 1976 | Cancer | Sunday |
| 25 December 1995 | Capricorn | Monday |
| 14 February 2005 | Aquarius | Monday |
When You'll Need This
Birthday countdowns
The calculator shows exactly how many days until your next birthday.
Age verification
Restaurants, retailers and online services ask for age on a specific date. Get it right in one glance.
Employment & retirement
Working out when you will hit a pension milestone, or exactly how long you have worked somewhere.
Medical & paediatric
Doctors and parents track infant age in weeks or months. The calculator shows those units instantly.
Astrology curiosity
See your Western zodiac sign and the day of the week you were born — just for fun.
Age FAQ
How is age calculated?
Age is calculated by subtracting the date of birth from the reference date, accounting for the exact number of days in each month and leap years.
How do I calculate my age in days?
Multiply your age in years by 365.25 and add the days since your last birthday. The calculator does this automatically and shows the exact number.
Does the calculator handle leap years?
Yes. Leap years and varying month lengths are handled automatically, so someone born on 29 February is counted correctly in non-leap years.
Can I calculate my age on a future date?
Yes. Change the "as of" date to any future date to see your age at that point in time. Useful for retirement planning, visa applications and event countdowns.
What is my zodiac sign?
The calculator shows your Western zodiac sign based on your date of birth. It does not include Chinese zodiac, Vedic astrology or other systems.
How does the calculator know what day I was born on?
It uses the calendar date to determine the day of the week. For example, 1 January 2000 was a Saturday.
Is my date of birth stored anywhere?
No. The calculation runs entirely in your browser. Nothing is uploaded, logged or shared. If you use a shared computer, clearing the browser history removes any URL state.
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