Time Converter

Time: convert between seconds, minutes, hours, and days using exact calendar-second definitions.

Works for any combination of the units above -- every value converts through the same verified base-unit math used on the individual pages.

How Time Units Relate

Time units follow a base-60 system (60 seconds per minute, 60 minutes per hour) that predates the metric system by thousands of years, rather than the base-10 pattern used elsewhere in SI. The day is treated as exactly 24 hours here for calendar and everyday purposes.

All Time Converters

Each of these has its own page with the exact formula, a reference table, and answers to common questions.

Hour to Minute Minute to Second Day to Hour

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