What is an age calculator?
An age calculator is a tool that precisely determines your age based on your date of birth. The result is displayed in years, months and days, along with the total number of days, weeks and months since birth.
How to calculate age?
Enter your date of birth and, optionally, a target date. If no target date is entered, the calculation uses today's date. The calculator computes the difference between the two dates and presents your exact age along with additional statistics.
What is the age calculation formula?
Age is calculated by subtracting the birth date from the target date. First, complete years are determined, then remaining months, and finally the remaining days. The total number of days is computed by counting all days between both dates.
Age calculation examples
If you were born on March 15, 1990, and today is July 20, 2025, your age is 35 years, 4 months and 5 days. That corresponds to more than 12,900 days since birth.
When to use an age calculator?
An age calculator is useful for determining exact age for filling out documents, counting down to a birthday, finding the age difference between two people, or simply discovering how many days you have been alive.
How many days until my birthday?
The calculator automatically computes how many days remain until your next birthday and shows the exact date of your upcoming birthday.