ToolNestFree Online Age Calculator
How old am I, exactly? Enter your date of birth and our free age calculator tells you your precise age in years, months, and days — plus total days lived, the day of the week you were born, and a live countdown to your next birthday.
—Years
—Months
—Days
✓ Free forever · ✓ No signup · ✓ Runs in your browser — your data never leaves your device.
How to Use the Age Calculator
- Enter (or pick) your date of birth.
- Click Calculate Age.
- See your exact age in years, months, and days — plus fun stats below.
- Great for forms, milestones, and birthday countdowns.
Why Use Our Age Calculator?
- Exact age — years, months, and days, leap years handled.
- Total days lived — the big number, computed precisely.
- Birthday facts — weekday of birth and countdown to your next birthday.
- Private — your birth date never leaves your browser.
Frequently Asked Questions
How is age calculated exactly?
Full years first, then remaining full months, then remaining days — accounting for leap years and varying month lengths.
Does it count leap years?
Yes — February 29 birthdays and leap days are handled correctly in the day count.
What day of the week was I born?
The calculator shows it automatically, along with how many days until your next birthday.
Can I calculate someone else's age?
Yes — enter any past date of birth; it's perfect for kids' milestone tracking too.
Is my birth date stored anywhere?
No. The calculation runs entirely in your browser.