Calculators & guides

Make more of every date.

Free tools and clear answers for exact ages, birthday countdowns, pet years, reminders and the milestones between birthdays.

Exact age in years, months and days

Calculate a precise calendar age on today or any comparison date.

Count every elapsed day and find the next thousand-day milestone.

See the days remaining and the age someone will turn.

Estimate a dog's human-age equivalent by age and size.

Understand how cats mature across their first years and beyond.

Compare small, medium, large and giant dog life-stage estimates.

Remember birthdays, adoption days and pet milestones on iPhone.

Build a reminder system for people you care about.

Keep the next important date visible on your Home Screen.

Find round ages, weeks and 10,000-day celebrations.

Keep anniversaries and meaningful recurring dates together.

Learn the difference between calendar age and pet-year estimates.