Birthday Calculator
Your age, the weekday you were born and exactly how long until your next birthday.
The Birthday Calculator bundles the three birthday questions people actually ask: How old am I now? What day of the week was I born on? And exactly how many days until my next birthday? Enter your date of birth and all three answers appear instantly.
The day you were born is a fun piece of personal trivia that the calendar reveals instantly — and the 'days until next birthday' countdown is the number people check when planning celebrations, or when wondering how soon they can legally do something. On the day itself, the tool switches to a cheerful birthday message with your new age.
Ages are rounded to full years with a note that precise age (years, months and days) lives in the Age Calculator. Everything is computed in your browser — your birth date never leaves your device.
Current age
36
Friday, June 15, 1990
Next birthday
Tuesday, June 15, 2027
Tuesday
Days until then
282
Age in years uses an approximate 365.2425-day year (the Gregorian average). Exact age to the day is available on the Age Calculator.
How to use the Birthday Calculator
- Enter your date of birth.
- Read your current age in years.
- Check the weekday you were born on.
- See your next birthday's date, weekday and the days remaining.
- On your birthday the tool celebrates with you automatically.
Frequently asked questions
What day of the week was I born on?
The calculator uses the Gregorian calendar to work backwards from your birth date and reports the exact weekday. For example, June 15, 1990 was a Friday. The math is deterministic and exact — no estimation involved.
How are the days until my next birthday counted?
The tool looks for the next occurrence of your birth month and day on or after today. If your birthday falls on February 29, the next occurrence is February 28 or March 1 depending on how your region handles it — the countdown uses February 28 in common years.
Can I calculate someone else's birthday details?
Absolutely — the tool works for any birth date, so you can check a friend's, partner's or child's next birthday countdown, or use it to plan a surprise.
Is this the same as an age calculator?
It shows age in whole years plus birthday-specific details (birth weekday and countdown). For an exact age with months and days, and ages at custom dates, use the Age Calculator — they complement each other.
Related tools
View all date & time tools →Age Calculator
Find your exact age in years, months and days — accurate down to the day.
Date & TimeDate Calculator
Add or subtract years, months, weeks and days to any date in one step.
Date & TimeDays Between Dates
Count the exact number of days between any two dates — instantly.
Date & TimeDate Difference Calculator
Get the full duration between two dates in years, months and days.
Date & TimeCountdown Timer
A live countdown to any date and time — days, hours, minutes and seconds.
Date & TimeDays Until Calculator
How many days until that big date? Count from today in one click.