Age Calculator
Free age calculator — find your exact age in years, months and days from your date of birth, plus total months, weeks and days. Runs in your browser.
Runs entirely in your browser — nothing you enter is uploaded or stored.
How the age breakdown works
Your age is shown the way a calendar reads it: complete years, then the remaining whole months, then the leftover days. To keep the day count honest, we borrow from the actual previous month rather than assuming 30 days.
Totals
Below the breakdown you also get the whole gap expressed as total months, total weeks (weeks plus spare days) and total days lived. These are handy for milestones and anniversaries.
Frequently asked questions
How is my exact age calculated?
We subtract your date of birth from the target date and express the gap as full years, then the leftover months, then the leftover days — borrowing from the previous month when a day or month would go negative, exactly like a calendar does.
Why does the day count use the previous month?
When the target day is earlier in the month than your birth day, we borrow one month and add the number of days in that previous month. This gives a true calendar breakdown instead of assuming every month is 30 days.
Can I find my age on a future or past date?
Yes. Change the “Age at date” field to any date. Leave it on today for your current age. If that date is before your birth date, the calculator will tell you instead of showing a negative age.
Is this age calculator private?
Completely. Every calculation runs locally in your browser — no dates are uploaded anywhere.