Age Calculator
Find exact age in years, months, days and total days.
Answer
Choose dates to calculate.
Personal work calendar
These are your manual rules, not an official national holiday calendar. Additional working dates override exclusions and weekly days off. Save before changing language.
Use YYYY-MM-DD, one date per line (maximum 500 per list).
How to use
- Enter a date of birth.
- Choose the age-on date.
- Read the exact age and total days.
- Open the birthday countdown if needed.
Quick reference
| Offline | The calculation runs in your browser. The route must have loaded once before it can reopen from cache without a connection. |
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| Browser limits | Date results use local calendar values in the browser; confirm timezone and date inputs before relying on the answer. |
Questions and answers
Can I calculate age on a past or future date?
Yes. Change the age-on date to calculate age at that point in time.
Does it show total days lived?
Yes. The result includes total calendar days between the birth date and the selected date.
Can I count down to the next birthday?
Yes. The result links to the countdown tool for the next birthday date.
More details and related tools
What "exact age" means here
The calculator returns both a calendar age and a total-day count. Calendar age answers the human question — years, months and days since the birth date. Total days answers the arithmetic question — how many calendar midnights have passed between the two dates.
- Change Age on to calculate age at a past event, future appointment or legal cutoff date.
- Leap-year birthdays are clamped to the last valid day of February when the target year has no February 29.
- The next-birthday link opens a countdown for the calculated birthday date.