Age Calculator

This calculator works out exactly how old you are by comparing your date of birth to today's date, then breaking the result into years, months, and days. It also surfaces fun totals like the number of days, weeks, and hours you've been alive.

The math uses real calendar dates, so the varying lengths of months and leap years are handled automatically. The day count is precise rather than a rough estimate.

Your age is also a useful anchor for sleep: recommended sleep changes across life, from 14–17 hours for newborns to 7–9 hours for most adults. Knowing your exact age helps you set realistic rest goals.