Birthday Calculator

Enter your date of birth and get your exact age, the weekday you were born, and a countdown to your next birthday.

Date of birth

Reference date

What you’ll see:
• Exact age in years, months and days
• Day of the week you were born
• Days until your next birthday
• Total days alive (and counting)

Use a custom reference date to calculate age at any point in the past or future.

🎂 Countdown

Days until your next birthday.

📅 Weekday of birth

The day of the week you were born.

📅 Any reference date

Age at any point in time.

🔒 Private

All calculations run locally in your browser.