Age Calculator
When you need to check age, the Age Calculator keeps the date and time arithmetic in one place. Review the input format before accepting the answer.
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How it works
The calculator counts full years from the birth date to the target date, then the remaining whole months, then the leftover days, accounting for the differing lengths of each month and for leap years. It is the same method you would use counting on a calendar, done instantly.
How to use the Age Calculator
Enter the values requested by the tool and start with one realistic example. Read the result together with its unit or label, then change one input at a time if you want to compare options. Keeping a note of the original figures makes the calculation easier to check later.
Dates, daylight saving and time zones can affect a result. Check the displayed inputs if the period crosses a calendar or location boundary.