Age Calculator
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About this calculator
Enter your birthdate to calculate your exact age. The calculator defaults to 20 years ago as a starting point, but you can change the date to any birthday. Select "Years, months & days" from the dropdown for a detailed calendar-based breakdown, or choose a single unit like days or hours for a specific count.
How it works
The age calculator subtracts your birthdate from today's date using calendar arithmetic rather than simple division. When you select "Years, months & days," it counts complete years first, then remaining complete months, then leftover days — the same method doctors and government agencies use. For single-unit results, it computes the total elapsed seconds and converts to your chosen unit.
When to use this calculator
Use this calculator to find your exact age for official documents, insurance applications, or immigration forms that require precise age information. Parents can track milestones — like how many days old a baby is. It's also fun for discovering your age in unusual units: how many hours old are you? How many seconds have you been alive?