Age Calculator
Calculate exact age in years, months, days, hours, and seconds with milestones & facts.
Date of Birth
Age At Date
How Age Is Calculated
Age is the elapsed time between a birth date and a reference date (defaulting to today). This calculator counts complete years first, then the remaining whole months, then the leftover days — correctly handling months of different lengths and leap years by borrowing from the previous month when needed. It also shows total weeks, hours, minutes, and seconds lived, plus a countdown to your next birthday. All math runs locally in your browser.
Private & free — this tool runs entirely in your browser.
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