Birthday Countdown
See how many days until your next birthday, plus your exact age and milestones reached.
Inputs
Days until next birthday
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Current age
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Next birthday
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Days alive
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Hours alive
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About Birthday Countdown
Half-birthdays
Add 6 months to your birthday to find your half-birthday. Useful for splitting celebrations or for half-year milestones like "I\u2019m 25 and a half".
Birthday paradox
In a group of 23 people, there is a >50% chance two share a birthday. By 70 people, it\u2019s 99.9%. Fewer than you\u2019d think.
Common birthdays
In the US, mid-September is the most common birth-month (suggesting peak conception around the holidays). February 29 is the rarest, naturally.