Age Calculator
Free online age calculator. Enter your birthdate to get exact age in years, months, days, plus total days, weeks, hours, day of week born, and days until your next birthday. 100% browser-based, no signup.
Enter your birthdate above to see your exact age.
Exact Age
Years, months, and days calculated by walking calendar months — not fixed 30-day blocks. Handles month-end and leap-year edge cases correctly.
Total Counts
Total days, total weeks, total months, and total hours since your birthdate — handy for tracking milestones or anniversaries.
Next Birthday
See the date of your next birthday and how many days are left until it. Plan celebrations, set reminders, or just satisfy curiosity.
Day of Week Born
Find out which day of the week you were born — Sunday through Saturday — based on your birthdate. Plus the date you turned (or will turn) any milestone age.
How is the age in years/months/days calculated?
The calculator walks calendar months from your birthdate to the target date. It counts full years (12 calendar months each), then remaining calendar months, then leftover days (borrowing from the previous month's length if the day-of-month underflows). This is more accurate than dividing total days by 365.25.
What is "age at date"?
By default the calculator uses today as the target date. Change "Age at date" to compute your age on any past or future date — useful for filling forms that ask your age as of a specific day, or for working out how old you will be on a future milestone.
Why does the day count not match years × 365?
Calendar years average ~365.2425 days (leap years add an extra day every 4 years, skipping 3 every 400 years). Over a lifetime these add up, so total days usually exceed years × 365. The total days figure is exact — counted from your birthdate to the target date.
How does the next-birthday countdown work?
The calculator looks at your birth month and day in the current year. If that date has already passed (or is today), it uses the same month/day next year. The countdown is the number of calendar days from today to that next birthday.
Is my birthdate stored anywhere?
No. All date math runs in your browser. Your birthdate is never uploaded, logged, or sent to any server. No signup, no cookies, no tracking.
Ready to use the Age Calculator?
Free, no signup, no watermark. 100% browser-based. Your data never leaves your device.
Open the tool