Age Calculator
Exact age in years, months, days, hours, and minutes. Shows next birthday too.
Age
31 years 1 months 27 days
Next birthday
Tuesday, June 15, 2027
In 308 days
An age calculator finds an exact age from a birth date: not just the number of years, but the precise years, months, and days, along with totals like age in days and the time until the next birthday.
Enter a date of birth and, optionally, a date to measure to. The tool breaks the span into years, months, and days and shows several other ways to express it.
Simple year subtraction is often wrong near a birthday. Counting down to the day gives an accurate age for forms, milestones, and curiosity alike.
How this calculator works
The calculator counts full years from the birth date to the target date, then the remaining full months, then the leftover days, borrowing from the next larger unit when needed (much like subtracting mixed units). It also converts the total span into a single unit, such as total days or hours, by working from a day count that accounts for varying month lengths and leap years. The next-birthday countdown finds the upcoming anniversary of the birth date and counts the days remaining. Whether the birthday has occurred yet this year determines the year figure.
What affects the number
- Whether this year's birthday has passed determines the completed-years count.
- Month lengths vary, so the months-and-days remainder is not a fixed fraction of a year.
- Leap years affect totals for spans that cross February 29.
- The target date matters; age today differs from age on a future or past date.
- Time zones can shift which day a birth moment falls on for very precise counts.
- Different conventions exist in some cultures, but the standard method counts completed years.
Frequently asked questions
How is exact age calculated?
Count the full years from the birth date to today, then the additional full months, then the leftover days. This gives an age like 34 years, 2 months, and 11 days, which is more precise than simply subtracting birth year from the current year.
Why isn't my age just the current year minus my birth year?
That shortcut is off by a year whenever your birthday has not yet occurred this year. Exact age depends on the month and day too, which is why the calculator checks whether this year's birthday has passed.
How many days old am I?
The calculator converts the span from your birth date to today into a total number of days, accounting for leap years. It can also express your age in weeks, hours, or minutes if you want a different view.
How is the next birthday countdown found?
The tool takes the month and day of your birth, finds the next time that date occurs on or after today, and counts the days until then. If your birthday is today, the countdown reads zero days.
This calculator provides general estimates for educational purposes only and is not financial, medical, legal, or tax advice. Your actual results depend on your specific situation and current rates.