We all know how many years old we are, but how about how many days or even minutes? Now you can play along with your kids and calculate your age—and theirs—in months, days, hours, minutes and seconds. 

A birthdate says it all. It is the one special day you will be remembered and celebrated as soon as you are born (and even long after you're gone). When you're pregnant, everything revolves around your due date, the day your baby will be born.

Calculate your baby's due date!

Depending on whether you believe in astrology and zodiac signs, a person's birth date can determine many things, including temperament and compatibility. Even if you don't put much stock into the stars and zodiac, it's all in good fun. Check out more fun and interactive tools that revolve around birthdays:

Future Birthday Calculator: Our future birthday calculator calculates the right days to have sex if you want the baby to have a specific birth date. In order to get pregnant, ovulation needs to take place at the right time. Once you calculate a future birth date and know which days to have sex, get your personal fertility report to find out if you are fertile and calculate your chances of getting pregnant.

Reverse Conception Calculator: What day was your baby was conceived? This conception calculator allows you to calculate the exact day of conception based on the weeks' gestation and delivery date.

Saints' Day Calculator: The Saints' day calculator lets you calculate which saints apply to your birth or other days. Enter the birthday or, if you are pregnant, enter the first day of your last period and we will let you know which Saints apply to your due date.

Chinese Gender Predictor and Pregnancy Calendar: This ancient Chinese gender predictor, or Chinese gender chart, predicts your baby's sex based on the mother's age and month of conception.