Birthday Calculators

An Emerald Birthday Calculator finds the birthday on which the age being turned matches the numerical position of the birth month. January corresponds to age 1, June to age 6,…

A Platinum Birthday Calculator applies an informal number-matching rule: the milestone occurs when the age you turn matches the final two digits of your birth year. A person born in…

A 21st Birthday Calculator determines the date on which someone turns 21 and explains where that milestone falls relative to a selected calculation date. The 21st birthday is culturally prominent…

An 18th Birthday Calculator finds the calendar date on which a person turns 18 and compares that milestone with a selected calculation date. It is useful for event planning, family…

A Golden Birthday Calculator finds the one birthday on which the age you turn matches the numbered day of the month on which you were born. Someone born on the…

Milestone birthday names are popular, but their definitions are not always consistent. The Golden Platinum and Diamond Birthday Calculator calculates three informal conventions on one timeline and clearly displays the…

Some birthdays appear more frequently in historical records than others. The Birthday Rarity Calculator compares a selected month and day with an embedded dataset covering 21 years of United States…

An Ethiopian Age Calculator should account for the Ethiopian calendar’s real month structure rather than subtracting seven or eight from a Gregorian year. The Ethiopian calendar contains twelve 30-day months…

A Silver Birthday Calculator finds the date on which a person turns 25. The name borrows the familiar silver association of a 25th anniversary, but a silver birthday is an…

A Quarter Birthday Calculator creates a practical schedule around the birthday year. Instead of showing only the annual birthday, it calculates the milestones three, six, and nine calendar months after…