23 free birthday and age tools
Your birthday, worked out to the second.
Enter your date of birth once and see your exact age, the weekday you were born, your zodiac sign, birthstone, generation and the countdown to your next birthday.
Your results appear here.
Enter a date of birth and choose Show my birthday facts.
Every birthday tool, in one place
Each tool explains exactly how it calculates, with examples and sources.
Age Calculator
Your exact age in years, months, days and seconds.
Age and timeHow Many Days Old Am I
Your age in days, plus the date of your 10,000th day.
Life in Weeks
Your whole life as a grid of weeks, ready to print.
Age Difference Calculator
The exact gap between two birthdays.
Retirement Countdown
Years, months and working days until you retire.
Age on Other Planets
How old you would be on Mars, Jupiter and beyond.
Days Until My Birthday
A quick answer, down to the second.
Birthday datesBirthday Countdown
A full-screen party countdown to share or embed.
Birthday datesGolden Birthday Calculator
The year you turn the age of the day you were born.
Birthday datesHalf Birthday Calculator
Six months from your birthday, plus your half birthday twins.
Birthday datesWhat Day Was I Born
The weekday you were born and what the rhyme says about it.
Zodiac Sign Calculator
Your sun sign, element and traits.
Chinese Zodiac Calculator
Your animal and element, using the Lunar New Year date.
Life Path Number Calculator
Reduce your birth date to one number, with every step shown.
Lucky Number Calculator
Numbers drawn from your birth date, with the method shown.
Birthday Compatibility Calculator
A match score for two birthdays.
Birthstone Finder
Your birthstones and their colors.
Birth Flower Finder
Your birth month flower and what it means.
Birthday Calendar
Keep family, class or office birthdays in one calendar.
Anniversary Calculator
Time together, the next milestone and the gift for each year.
Why people trust the answers
Exact to the day
Leap years, month lengths and your local time zone are all handled. Every tool shows the rule it uses.
Your date stays with you
Calculations run in your browser. BdayChecker does not store the birth dates you enter.
Sources you can check
Data tools name their source, such as US birth records from the CDC and the Social Security Administration.