Calculator categories

Time & Date

Age, days between dates, time zones, duration. 3 free calculators with the formula, worked examples, and FAQ on every page. All math runs in your browser — nothing is sent to a server.

Age calculator

Exact age in years, months, days — plus total months, weeks, days, and hours lived

Days between dates

Exact number of days, weeks, months, and years between any two dates

Time duration converter

Convert between seconds, minutes, hours, days, weeks, months, and years