How exact age is calculated
The calculation counts complete months first, then measures the remaining calendar days. This produces a clear years, months, and days result across month and year boundaries.
Free online tool
Age Calculator
Calculate your exact age from your date of birth, including years, months, days, zodiac signs, and milestones. Optionally add your birth time and place for Rising Sign, Moon Sign, and Moon Phase insights.
Results use calendar dates on your device. Hour and minute totals are estimates based on 24-hour days.
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Find the exact time between two calendar dates.
Birthday Countdown
See how many days remain until your next birthday.
Age in Days
Calculate the exact number of days you have lived.
Age in Weeks
Convert your age into completed weeks and days.
Age in Months
Count completed calendar months and remaining days.
Future Age
Find your age on a specific future date.
About the calculation
What is an age calculator?
An age calculator finds the time between a date of birth and today. Unlike a simple year subtraction, it checks whether the birthday has occurred and accounts for the different lengths of months.
Why subtracting years can be wrong
Subtracting birth year from the current year can overstate age when this year’s birthday has not happened yet. Exact age needs the month and day too.
Leap years and February 29
Leap days are included in total-day counts. For someone born on February 29, the birthday countdown uses February 28 in a non-leap year.
Common uses
Check an age for forms, school or sports eligibility, travel planning, family records, milestone celebrations, zodiac signs, or simple curiosity. Optional birth details can also calculate astronomical Moon data and traditional Rising and Moon signs.
Accuracy and transparency
Calendar-aware results you can understand
AgeExactly uses real calendar arithmetic and clearly labels approximate totals. The calculation runs without an account, and your date of birth is not saved by the calculator.
Real month lengths
Years and months are counted as calendar units, not converted from an average number of days.
Edge cases covered
Leap years, February 29 birthdays, month ends, future dates, and birthday boundaries are handled explicitly.
Methodology explained
See how calculations, optional birth insights, privacy choices, and important limitations are documented on the About page.
Helpful answers
Frequently asked questions
How do I calculate my exact age?
Enter your date of birth and select Calculate Age. The calculator compares it with today’s date, then shows the completed years, months, and remaining days.
How many days old am I?
Your result includes the total number of calendar days between your birth date and today. This count automatically includes leap days.
Does the calculator account for leap years?
Yes. It follows the Gregorian calendar rules: years divisible by 4 are leap years, except century years unless they are also divisible by 400.
How is a February 29 birthday handled?
In leap years, the birthday is February 29. In non-leap years, this calculator uses February 28 for the next-birthday countdown.
How many days until my next birthday?
The result counts the calendar days from today to your next birthday. If today is your birthday, it shows zero days.