Age Calculator — Find Your Exact Age in Years, Months and Days
Enter your date of birth and this calculator will tell you your exact age — in years, months, days, and even total hours lived. Also shows when your next birthday is and what day of the week you were born on.
Perfect for filling in forms, curiosity, milestone planning, or finding out the age of anything from a person to a building or a historical event.
Free foreverNo data storedInstant resultsAccurate formula
Enter dates
Enter a date of birth above to calculate the exact age.
Age breakdown
Age
—
Total months
—
Total days lived
—
Total hours lived
—
Next birthday
—
Day born
—
Advertisement
How Age Is Calculated
Age is calculated by counting the number of complete years, months, and days from the date of birth to the reference date. The tricky part is handling months of different lengths and leap years — this calculator accounts for all of these automatically.
Example: Born on March 15, 1990 — age on October 24, 2026: 36 years, 7 months, 9 days · 13,372 total days · 321,000+ hours
What else can you calculate with this tool?
Beyond personal age, you can use this calculator to find the age of anything: how old is a company founded in 1998? How many days since a historical event? How long has a project been running? Simply enter the start date as the "date of birth" and today's date (or any future date) as the "calculate age on" field.
Leap years and month lengths
A leap year occurs every 4 years (with exceptions for century years), adding an extra day to February. The calculator handles all of these edge cases correctly, so someone born on February 29 will get accurate results every year — their birthday is counted as March 1 in non-leap years.
Frequently Asked Questions
How is exact age calculated?
Exact age is found by counting complete years from the date of birth to the target date, then counting remaining complete months, then remaining days. This handles varying month lengths and leap years correctly.
What day of the week was I born on?
Enter your date of birth in the calculator above — it will show the day of the week automatically. This uses Zeller's algorithm to calculate the correct day for any date going back centuries.
How many days old am I?
Enter your date of birth in the calculator. The total days field shows the exact number of days you have been alive, accounting for all leap years.
Can I calculate the age of something other than a person?
Yes. Enter the founding date, creation date, or start date as the 'date of birth,' and the calculator will tell you how old a company, building, project, or event is — in years, months, and days.