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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
month (average) [mo]
Definition
A month is a calendar unit; conversion pages use an average month when a fixed factor is needed.
History
Months are based on calendar traditions linked to lunar cycles and civil calendars.
Current use
Months are used for billing, rent, salaries, subscriptions, forecasts, age, and long-term planning.
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.