How to use this calculator
Enter the values requested above. The result updates as you change each field, so you can compare different values without reloading the page.
Worked example
Example: from 26 September, a 1 October birthday is 5 days away.
Home / Birthday
Birthday countdown
Choose a birth date to see the next birthday date and how many days remain.
Countdown5 daysNext birthday: October 1, 2026