Durations across every scale
Converting a duration — hours to minutes, days to hours, seconds to milliseconds — is simple arithmetic that is easy to get wrong under pressure. This converter handles the whole range from milliseconds to years in one place, in either direction.
Units, not calendar dates
Note that months and years use the standard 30- and 365-day approximations. For the exact gap between two actual dates, the Date Difference calculator accounts for leap years and real month lengths. This tool runs entirely on your device.