Time Converter

Most time units here convert cleanly through fixed ratios — 60 seconds to a minute, 60 minutes to an hour, 24 hours to a day — so those results are exact. Years are the exception: a calendar year is 365 days, but the actual time it takes Earth to orbit the sun is closer to 365.2422 days, which is why leap years exist and why any years-to-days conversion is necessarily an approximation over long spans.

This makes the tool handy for project planning, such as converting a deadline given in weeks into days or hours, understanding subscription or billing periods expressed in different units, and general scheduling or science calculations that mix units.

If you're converting several years into days or hours and need day-level accuracy, it's worth manually accounting for leap years rather than relying on a flat 365-day average, since the gap compounds — four years is closer to 1,461 days than 1,460.