Birthday Facts Calculator
Season, exact age, birth weekday & zodiac sign — instantly, and your birthdate never leaves your device.
Your birthdate never leaves your browser
Everything is calculated on your device. Nothing is sent anywhere.
How it works
This free calculator works out the meteorological season of your birthday, your exact age down to the day (leap years included), the weekday you were born, and your Western zodiac sun-sign. Seasons are reversed below the equator, so you can switch between the Northern and Southern hemispheres and the result updates instantly. Every calculation runs in your browser — your date of birth is never uploaded, stored, or shared.