Age Calculator – Calculate Your Exact Age
Free online age calculator from ToolGuru. Enter a date of birth and an optional date to calculate exact age in years, months, and days — including leap years — in your browser.
🔒 Your calculations are performed in your browser and are not uploaded.
Free Online Age Calculator
Find exact age from a date of birth in years, months, and days. Use it to answer “how old am I?” or to check age on another date, such as a school cutoff or a work anniversary.
How Age Is Calculated
This is calendar arithmetic, not milliseconds divided by 365. Months have different lengths, and leap years add February 29. The result is the completed years, then leftover months, then leftover days between the two dates.
Calculate Age Between Two Dates
“Calculate age on” defaults to today on your device. Change it to measure age on a past or future calendar day. Dates are read as year-month-day so time zones do not shift the selected day. If the date of birth is after the calculation date, you will see an error instead of a negative age.
How to Use the Age Calculator
Enter the date of birth, confirm the calculation date, and choose Calculate Age. To compare two dates that are not a birthday, use the Date Difference Calculator.
Privacy
Your calculations are performed in your browser and are not uploaded.
How to Use the Age Calculator
Step 1
Enter the date of birth
Use the date field. The calculator treats it as a calendar date, not a time-zone timestamp.
Step 2
Choose the calculation date
It defaults to today on your device. Pick another date to find age on a past or future day.
Step 3
Calculate age
See years, months, and days, plus totals and the next birthday. February 29 birthdays are observed on March 1 in non-leap years.
Frequently Asked Questions
How is age calculated?
Age uses calendar dates: years, then leftover months, then leftover days. It does not divide milliseconds by 365, so leap years and month lengths stay correct.
Can I calculate age on a date other than today?
Yes. “Calculate age on” defaults to today and can be set to any date on or after the date of birth.
What happens with a February 29 birthday?
In leap years the birthday is February 29. In other years it is observed on March 1, the day after February 28.
Is the age calculator free?
Yes. Calculate age without an account.
Are dates uploaded?
No. Your calculations are performed in your browser and are not uploaded.
Related tools
Calculators
Date Difference Calculator
Calculate years, months, and days between two calendar dates.
Calculators
Percentage Calculator
Find a percentage of a number, what percent one value is of another, or percentage change.
Calculators
Discount Calculator
Calculate sale price, discount amount, and savings from a percent off.