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Sources and Accuracy
Time conversions use second as the reference unit. Calendar-style values such as average month and average Gregorian year are approximate by definition.
Displayed results are rounded for readability. The calculator keeps enough precision for everyday use and switches to scientific notation for very large or very small values. Last reviewed: 2026-05-21.
About These Units
hour [h]
Definition
The hour is a time unit equal to 60 minutes or 3600 seconds.
History
Hours have ancient roots in dividing the day and night into regular intervals.
Current use
Hours are used for work time, travel duration, billing, appointments, energy use, and daily planning.
minute [min]
Definition
The minute is a time unit equal to 60 seconds.
History
Minutes come from sexagesimal timekeeping, where hours are divided into 60 parts.
Current use
Minutes are used for schedules, cooking, travel, workouts, calls, meetings, and timing tasks.