Date and time
Age calculator
Age calculator: Find age on a chosen date in years, months and days. Get an instant result with a clear formula, worked example and explanation.
Your numbers
Both a decimal point and a comma work.
Result
36
Years
- Months
- 9
- Days
- 5
- Total days
- 13,427
How it works
Calendar years, months, days
Using the calculator
Enter: Date of birth · Age as of. Calculation: Calendar years, months, days.
Worked input and result
Example: Date of birth = 2000-06-15; Age as of = 2026-09-23. Result: Years = 26 (Months: 3; Days: 8).
Understanding the result
Counts completed calendar years and months, then remaining days. Missing month days are clamped to the month-end: for example, February 29 becomes February 28. This is a calendar calculation, not a legal age determination.
Age is counted in completed calendar years, with remaining months and days measured from the last birthday. The reference date must not be before the birth date.