Age Calculator & Birthday Countdown
Free age calculator — find your exact age and days until your next birthday
Enter a date of birth and you'll get an exact age down to the day, the weekday you were born on, your star sign and Chinese zodiac year, and a live countdown to the next birthday. It works for any date, so it's just as happy telling you a grandparent's age in days as it is counting down to a toddler's third birthday.
Enter Your Birthday
Next Birthday Countdown
Your Age & Stats
How your exact age is worked out
Age sounds simple until you try to pin it to the day. The calculator counts the whole years since your birth, then the leftover months, then the leftover days — which is why the "days" figure drops to zero on your birthday and climbs again from there. Someone born on the 30th of March is 40 years and 2 days old on the 1st of April of their fortieth year, not 40 years and a couple of months.
A leap-day birthday (29th February) is treated as the 1st of March in ordinary years for the countdown, which happens to be the convention most of British law uses as well.
❓ Frequently Asked Questions
How do I calculate my exact age? ▼
Enter your date of birth and click Calculate. The tool shows your age broken down into years, months, days, hours, minutes, and seconds, updating live every second.
How many days until my next birthday? ▼
The countdown shows the exact number of days, hours, minutes, and seconds remaining until your next birthday at midnight in your local time zone.
What day of the week was I born? ▼
The calculator automatically works out the day of the week for any date of birth, so you can find out if you were born on a Monday, Friday, or any other day.
How old will I be on a specific future date? ▼
Enter your date of birth as normal — the results show your age as of today. For a future date, you can use the Days Counter tool to add the difference onto your current age.
What is my star sign based on my birthday? ▼
The calculator automatically determines your Western astrological star sign (e.g. Aries, Taurus, Gemini) based on your day and month of birth and displays it alongside your age.
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