Calculators & guides
Free age, birthday, star sign and pet calculators
Get an immediate answer for exact age, days lived, birthday countdowns, star signs, dog years and cat years, then keep the dates that matter in LifeDates.
Exact age in years, months and days
Calculate a precise calendar age on today or any comparison date.
Free calculatorHow many days old am I?
Count every elapsed day and find the next thousand-day milestone.
Free calculatorBirthday countdown
See the days remaining and the age someone will turn.
Free calculatorWhat is my star sign?
Find the Western zodiac sign for a date of birth.
DogsDog age in human years
Estimate a dog's human-age equivalent by age and size.
CatsCat age in human years
Understand how cats mature across their first years and beyond.
ReferenceDog age chart
Compare small, medium, large and giant dog life-stage estimates.
Pet birthdaysPet birthday reminders
Remember birthdays, adoption days and pet milestones on iPhone.
iPhoneBirthday reminder app
Build a reminder system for people you care about.
WidgetsBirthday widget for iPhone
Keep the next important date visible on your Home Screen.
MilestonesLife milestone tracker
Find round ages, weeks and 10,000-day celebrations.
OrganiseImportant dates tracker
Keep anniversaries and meaningful recurring dates together.
PetsPet age calculator
Choose dog or cat and get an immediate human-age estimate.
Our methodsCalculation methodology
See the rules, sources, edge cases and test examples behind every calculator.