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Calculate your exact age, explore important dates, count down to birthdays and discover useful calendar facts. Fast, free and private.
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For birthdays, milestones, projects and everyday planning.
Age & birthdaysExact Age Calculator Calculate exact age in years, months and days from your date of birth, with total weeks and days too.Age & birthdaysBirthday Countdown Find the number of days until your next birthday and see the weekday and age you will turn.Date toolsDate Difference Calculator Find the exact gap between two calendar dates in years, months, days and total days.Date toolsDays Until Calculator Count down the calendar days until an event, holiday or deadline.Age & birthdaysBaby Age Calculator Calculate a baby’s age in months, weeks and days without rough four-week-month shortcuts.Date toolsBusiness Days Calculator Count weekdays between two dates, excluding Saturdays and Sundays.
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AGE & BIRTHDAYS
14 calculatorsAge & birthdays
Age & birthdaysExact Age Calculator Calculate exact age in years, months and days from your date of birth, with total weeks and days too.Age & birthdaysBirthday Countdown Find the number of days until your next birthday and see the weekday and age you will turn.Age & birthdaysAge on a Specific Date Find out exactly how old someone was or will be on a selected past or future date.Age & birthdaysAge Difference Calculator Compare two birthdays and see the exact age gap in calendar years, months and days.Age & birthdaysBaby Age Calculator Calculate a baby’s age in months, weeks and days without rough four-week-month shortcuts.Age & birthdaysAge in Days Calculator Find your exact age in days, including every leap day between your birthday and today.Age & birthdaysAge in Weeks Calculator Convert your birthday into completed weeks plus leftover days.Age & birthdaysAge in Months Calculator Find how many full calendar months you have lived and the extra days beyond them.Age & birthdaysAge in Hours Calculator Estimate your elapsed age in hours using your date and local time of birth.Age & birthdaysAge in Minutes Calculator Find approximately how many full minutes have elapsed since your recorded birth date and time.Age & birthdaysDays Alive Milestone Calculator Find your next 1,000-day, 5,000-day or 10,000-day life milestone.Age & birthdaysHalf Birthday Calculator Discover your next half birthday, six calendar months after your birthday anniversary.Age & birthdaysBirthday Weekday Calculator See what day of the week you were born and when your birthday falls this year.Age & birthdaysBirth Year Calculator Find the likely birth year from someone’s completed age, birthday month and day.
DATE TOOLS
12 calculatorsDate tools
Date toolsDate Difference Calculator Find the exact gap between two calendar dates in years, months, days and total days.Date toolsDays Until Calculator Count down the calendar days until an event, holiday or deadline.Date toolsDays Since Calculator Calculate the number of days since an event, appointment or milestone.Date toolsAdd or Subtract Days Move a date forward or backward by any number of calendar days.Date toolsAdd or Subtract Months Add or subtract full calendar months from a chosen date with month-end handling.Date toolsBusiness Days Calculator Count weekdays between two dates, excluding Saturdays and Sundays.Date toolsISO Week Number Calculator Find the ISO 8601 week number and ISO week-year for any calendar date.Date toolsDay of Year Calculator Check which numbered day of the year a date falls on, from 1 to 365 or 366.Date toolsDay of the Week Finder Discover the weekday for any date, past or future.Date toolsLeap Year Checker Check whether a year is a leap year and how many days it contains.Date toolsNext Leap Day Countdown See the date and number of days until the next 29 February.Date toolsTime Between Dates & Times Measure elapsed hours, minutes and days between two local date-and-time values.
MILESTONES & LIFE
2 calculatorsMilestones & life
PETS & FUN
6 calculatorsPets & fun
Pets & funDog Age Calculator Convert a dog’s age into an approximate human-age comparison by size.Pets & funCat Age Calculator Estimate a cat’s age in human-equivalent years using a staged life comparison.Pets & funWestern Zodiac Sign Calculator Find a popular Western sun sign from a birthday’s month and day.Pets & funChinese Zodiac Animal Calculator Get an approximate Chinese zodiac animal by birth year, with a lunar-new-year reminder.Pets & funGeneration Calculator See a commonly used generation label for a birth year, with clearly marked approximate boundaries.Pets & funAge on Mars Calculator Compare your Earth age with the number of Martian years that have elapsed since your birth.
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BUILT FOR REAL LIFEDates are complicated.
Dates are complicated.
Answers shouldn’t be.
Real calendars have leap years, uneven months and surprisingly tricky edge cases. We make the maths simple so you can focus on the answer.
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QUESTIONS, ANSWERED
Good to know
Are AgeGlide calculators free?
Yes. You can use all 34 calculators without an account or subscription.
How do you calculate age accurately?
We count completed calendar years, then calendar months, then the remaining days. Leap years and shorter months are included.
Do you store my date of birth?
No. Our calculators process the dates in your browser. We do not require accounts or submit birthday fields to our servers.
Can I use these results on official documents?
AgeGlide is a general-purpose guide. Check official rules for legal age limits, retirement, benefits or other formal decisions.