Seconds, minutes, hours, days and weeks have fixed relationships: 60 seconds per minute, 60 minutes per hour, 24 hours per day and 7 days per week. Months and years vary, so this converter uses fixed averages: 2,629,746 seconds per month and 31,556,952 seconds per year (365.2425 days). Results involving months or years are estimates, not calendar-date calculations. It is useful for rough duration comparisons, converting video lengths or turning a large number of seconds into days and hours. For a deadline or age tied to actual calendar dates, use a date-based calculator instead.
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