How the age calculator works
Age is calculated by finding the calendar difference between your date of birth and the reference date, carrying over months and days correctly across different month lengths and leap years — not simply dividing total days by 365.
Step-by-step guide
- Enter your date of birth.
- The 'as of' date defaults to today, or set any other date to calculate age at a specific point in time.
- Read your age in years/months/days, total days lived, and days until your next birthday.
Other uses for this calculator
Beyond checking your own age, this tool is useful for calculating eligibility ages (school admission cut-offs, retirement age, legal age thresholds) or the exact duration since any milestone date.
Frequently asked questions
Because years vary slightly with leap years and months have different lengths, a calendar-based day-month-year breakdown gives an exact result rather than an approximation.
Yes — the calculator correctly handles this, showing age in complete years, months and days regardless of where the birthday falls relative to the 'as of' date.
Yes — set the 'date of birth' field to the earlier date and the 'as of' field to the later date to get the exact duration between them.