What Is a Chronological Age Calculator?
A chronological age calculator works out exactly how much time has passed since your date of birth — down to the year, month, week, and day. It's the simplest and most accurate way to calculate your age by date of birth, free of charge and without creating an account.
How to Calculate Your Age in Years, Months, and Days
Enter your birth month, day, and year above, or switch to the single date picker if you prefer. This free online chronological age calculator instantly works out your age in months, your total age in days, total weeks lived, and the number of days until your next birthday.
Chronological Age vs. Biological Age
Chronological age is purely calendar-based: the actual time elapsed since birth. Biological age, by contrast, is an estimate of how old your body functions based on health, fitness, and lifestyle factors, and can differ from your chronological age. This tool calculates chronological age only.
Frequently Asked Questions
Is this chronological age calculator free?
Yes. This online chronological age calculator is completely free to use, with no sign-up and no data stored.
Can I calculate my age in months instead of years?
Yes. Alongside your age in years, the calculator shows your total age in months, weeks, and days.
What's the difference between this and a biological age calculator?
This tool calculates your exact chronological age from your date of birth. A biological age calculator instead estimates how old your body appears based on health markers, which is a separate kind of calculation.
Does it work if I only know the year and month, not the exact day?
You'll get the most accurate result with the full date of birth. If you're unsure of the exact day, an approximate day will still give you a close estimate of your age in years and months.