About BdayChecker
Birthday and age tools, worked out to the second
BdayChecker is a free collection of birthday, age and date tools. Type a birth date and get a clear answer: your exact age, the days until your next birthday, the weekday you were born or how rare your birthday is.
Every tool is free, needs no account and works on a phone as well as a computer. Dates are shown the US way (MM/DD/YYYY).
What you can do here
- Age Calculator: Your exact age in years, months, days and seconds.
- How Many Days Old Am I: Your age in days, plus the date of your 10,000th day.
- Days Until My Birthday: A quick answer, down to the second.
- Birthday Countdown: A full-screen party countdown to share or embed.
- Golden Birthday Calculator: The year you turn the age of the day you were born.
- Half Birthday Calculator: Six months from your birthday, plus your half birthday twins.
- What Day Was I Born: The weekday you were born and what the rhyme says about it.
- How Rare Is My Birthday: Where your birthday ranks among all 366 days, from US birth records.
- Birthday Twin Finder: How many people share your birthday, and the odds of meeting one.
- What Generation Am I: Boomer, Gen X, Millennial, Gen Z or Gen Alpha.
More tools, guides and an Android app with birthday reminders are on the way.
Your dates stay on your device
Every calculation runs in your browser. The birth dates you type are not sent to us or stored on a server, so there is nothing to sign up for and nothing to delete afterwards.
How every tool is checked
The rule is written down
Each tool explains its exact rule on the page: how months are counted, what happens on February 29 and who defines the dates, so you can check the math yourself.
Hard dates are tested
Every calculator is tested on leap days, month ends and New Year's Eve, in more than one time zone, before it goes live.
Facts come from public sources
Birthday statistics come from CDC and Social Security data, and generation years from the Pew Research Center. Each fact is checked against its source before it is published.
Who makes BdayChecker
BdayChecker is built and run by Daniel Hart, a software developer who started it after a job change wiped out a calendar full of saved birthdays. Read the story behind it.
The site is independent and free to use. It will be paid for by ads, and by readers who choose to support BdayChecker.
Zodiac, numerology and lucky-number tools are for entertainment.
Get in touch
Spotted a mistake, or wish a tool existed? Write to contact@bdaychecker.com. Corrections are always welcome.