Age Calculator
Exact age in years, months and days — plus totals, your birth weekday and the countdown to your next birthday.
About this tool
"How old exactly?" comes up more often than you'd think — forms, milestones, curiosity, kids demanding precision. This calculator turns a date of birth into an exact age in years, months and days, handling leap years and different month lengths correctly. It also shows total months, weeks, days and hours lived, the day of the week you were born, and how many days until the next birthday.
You can also set the "age at" date to something other than today — useful for "how old was she when…" questions and for forms that ask your age on a specific date.
How to calculate an age
- Pick the date of birth.
- Leave "age at" as today, or change it to any other date.
- Read the exact age and the totals — updated instantly.
Frequently asked questions
How is exact age calculated?
The calculator counts full calendar years from your birth date, then full months, then remaining days — the same way ages are counted for official purposes. Month lengths and leap years are handled by the calendar itself, so the result is exact.
Can I calculate age at a date other than today?
Yes — change the "age at" date to any day, past or future, to see how old someone was or will be on that date. It defaults to today.
How does the calculator handle leap-year birthdays?
If you were born on 29 February, your next birthday countdown targets 1 March in non-leap years — the convention most jurisdictions use — and 29 February when it exists.
Is my date of birth stored anywhere?
No. Everything is computed in your browser and nothing is transmitted or saved.