Age Calculator
Calculate your age in years, months, and days. You can also check your age on a past or future date.
Your Age
Age is calculated using calendar years, months, and days between the two selected dates.
What Is an Age Calculator?
An age calculator is a free online tool that calculates the difference between a date of birth and another calendar date. It displays age in years, months, and days and can also calculate the total number of days between the dates.
How to Use This Age Calculator
Select your date of birth, then select the date on which you want to calculate your age. The second field defaults to today. Click Calculate My Age to see your result. Use Reset to clear the form and start again.
How Is Age Calculated?
The calculator compares the year, month, and day of the selected dates. When the ending day is earlier than the birth day, it borrows the number of days from the previous calendar month. When the ending month is earlier than the birth month, it adjusts the year. This accounts for months with different lengths and leap years.
When Is an Age Calculator Useful?
You can use an age calculator to check your age for personal records, plan birthday celebrations, calculate an age on a historical date, or find out how many days have passed since a particular birth date. For official forms, follow the rules of the relevant organization if it defines age differently.
Frequently Asked Questions
Is this age calculator free?
Yes. You can use this calculator for free in your browser without installing an application.
Can I calculate my age on a past or future date?
Yes. Select a date in the Calculate Age On field. The date must be the same as or later than your date of birth.
Does the calculator account for leap years?
Yes. The calculation uses calendar dates and actual month lengths, including February in leap years.
Can I use this calculator on my phone?
Yes. The page is responsive and is designed for smartphones, tablets, and desktop computers.
How does the calculator handle a February 29 birthday?
The calculator compares the selected calendar dates and adjusts for the actual number of days in each month. Different official or legal contexts may apply their own rules to birthdays on February 29.
Learn More About Age Calculation
For more details, examples, and common date-calculation questions, read our guide: How to Calculate Age: Formula, Examples and Easy Guide .
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