Pick your birth date and the date to measure your age at. “Age at date” defaults to today.
Get your age in exact years, months and days using real calendar math that borrows correct month lengths — not a rough decimal estimate.
See your age as total months, weeks, days and hours, perfect for milestones, paperwork or just curiosity.
The calculator counts the days to your next birthday and names the weekday it falls on.
All math runs in your browser with no server calls. Your date of birth is never uploaded, and the tool works offline once loaded.
The calculator subtracts your date of birth from the target date and expresses the gap in whole years, months and days. When the day or month would go negative it borrows from the previous month or year, using the real length of each calendar month so the result stays accurate.
It converts the full span between the two dates into totals: total days is the elapsed time divided into whole days, total weeks is the days divided by seven, and total hours is the span measured in hours. These totals count every calendar day, including leap days.
The tool finds the next occurrence of your birth month and day on or after the target date and counts the days until then. If your birthday is on the target date it shows “Today!” instead.
Yes. All math uses the browser’s native Date object, which follows the Gregorian calendar including leap years, so month lengths and day counts are computed accurately.
Yes. The calculation happens entirely in your browser with no server calls, so your birth date is never uploaded and the tool works offline once loaded.
This age calculator is provided for general informational and convenience purposes. Results are based on the dates you enter and the Gregorian calendar; always verify exact ages against official records for legal or medical purposes.