Calculate your exact age in years, months, days, hours, minutes, and seconds. Find out your next birthday and other age milestones.
Date: --
Day: --
Time Until: --
Age You'll Be: --
This calculator turns a date of birth into a precise age using real calendar arithmetic rather than a fixed 365-day year. It counts whole years, then months, then days, borrowing from the actual length of the previous month when needed, so leap years and the uneven lengths of calendar months are handled correctly. It also totals your age in months, weeks, days, hours, and minutes.
Beyond the raw numbers, the page works out your next birthday: its exact date, the weekday it falls on, how long until it arrives, and the age you will turn. It lists life milestones from your first birthday through legal adulthood and retirement age, marking which you have already reached, and it identifies your zodiac sign from the month and day of birth. The optional Age at Date field computes your age at any reference date instead of today, which is useful for eligibility deadlines, school cutoffs, and historical research.
Two details are worth knowing. The week, day, hour, and minute totals are measured from midnight on the birth date to midnight on the reference date, so they count whole calendar days. And if you were born on February 29, the next-birthday logic rolls your anniversary to March 1 in common years and back to February 29 in leap years. If you work with dates in software, the timestamp converter translates Unix timestamps into readable dates, and the sleep calculator can plan a bedtime that protects the rest your age group needs.
The calculator subtracts the birth year, month, and day from the reference date separately. When the day count would go negative, it borrows from the previous month's actual length, and when the month count goes negative it borrows a year. That is why the result matches how people state their age rather than a simple division of total days.
The next-birthday calculation uses February 29 whenever the target year is a leap year and rolls the date to March 1 in common years, which is the standard convention. Total-day counts simply include every February 29 that passed between the two dates, so no days are lost.
The total-days figure counts every calendar day between midnight on your birth date and midnight on the reference date, including leap days. The hours and minutes totals are built from the same whole-day span, so they always come out as exact multiples of 24.
It lets you compute an age at any moment other than today. Typical uses include checking a child's age against a school enrollment cutoff, verifying someone's age on a contract or competition date, or finding how old a historical figure was at a specific event.
Zodiac signs are determined purely by the month and day of birth, mapped against the standard date ranges for each sign, for example Aries from March 21 to April 19. The calculation is astronomical calendar convention, not astrology; the page simply reports the sign the date falls in.