Birthday Countdown
Days until birthday = Next birthday date − TodayJune 15, 2026 − June 10, 2026 = 5 calendar days
Free online tool
Birthday Countdown
Enter your birth date to count calendar days until your next birthday using your device's local date. The birth year validates the date; the countdown uses the month and day.
Instant calculation
Birthday Countdown
Enter your birth date to see the countdown to your next birthday.
Your result
Calculation
Your numbers stay in this browser. Nothing is uploaded or saved.
Three clear steps
How to use this calculator
- 01
Enter your birth date
Type the month and day of your birthday (and year for reference).
- 02
See the countdown
The calculator counts calendar days and also shows whole weeks and approximate 30-day months.
- 03
Check the date
You will also see the exact date of your next birthday.
The formula
How this calculation works
Use today's local calendar date. Find the birth month and day in this year; if it has passed, use next year. For February 29, use March 1 when the target year is not a leap year. Count calendar days to that date; whole weeks are days divided by 7 and approximate months are days divided by 30.
Check the method
Worked examples
Each example follows the same formula used by the calculator.
Birthday June 15 — how long if today is June 10, 2026?
June 15, 2026 − June 10, 2026 = 5 calendar days5 days; 0 whole weeks; 0 approximate monthsWhat if today IS my birthday?
Next birthday = today; days until = 0Happy Birthday! 0 daysCommon questions
Questions about this calculation
How does the birthday countdown work?
The calculator finds the next calendar date matching your birth month and day. It then counts the days from today to that date.
What happens when today IS my birthday?
The countdown shows 0 days and displays a birthday greeting. Your next birthday is exactly one year away.
Why does my Feb 29 birthday countdown change in non-leap years?
In non-leap years, Feb 29 is treated as Mar 1. The countdown reflects the actual next date your birthday will be observed.
Are the weeks and months in the countdown exact?
Weeks are calculated as floor(days / 7). Months are approximate (floor(days / 30)). For exact figures, refer to the days count.
Can I set a different countdown target?
The Birthday Countdown is specifically for birthdays. For other countdowns, use the Date Difference Calculator with your custom dates.
Continue calculating