Time calculator
Age Calculator
Calculate age in years, months, and days from a date of birth.
Quick answer
How do you calculate age?
Subtract the birth year from the current year, then subtract 1 if this year’s birthday hasn’t happened yet. For exact age, count the remaining months and days since the last birthday.
⚡ Answer updates as you type · Enter = calculate · Esc = reset
The Age Calculator converts a date of birth into age in years, months, days, plus the next birthday countdown.
About this Age Calculator
Find your exact age in years, months, and days from any birth date. Helpful for forms, insurance, school enrollment, and finding the day of the week you were born.
What you'll need
- • Date of birth
- • Optional: target date (defaults to today)
How it works
- 1. Enter your date of birth.
- 2. Optionally enter a target date.
- 3. The calculator returns full years, months and days plus total days lived.
Worked example
Someone born on March 15, 1990 was 36 years, 1 month, and 22 days old on May 7, 2026.
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Age Calculator FAQ
What is the Age Calculator?
The Age Calculator is a free online tool that helps you calculate age in years, months, and days from a date of birth.
How do I use the Age Calculator?
Open the Age Calculator, enter the requested values, and review the instant estimate on the page.
Is the Age Calculator free?
Yes. The Age Calculator is free to use on Fast Online Calculator and does not require an account.
Why does the age sometimes differ by a day?
Time zones and leap years can shift the count by one day. The calculator uses the local date you enter.
Can I find age between two non-today dates?
Yes—set the target date to anything you like to find the gap between two specific days.
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