How the conversions work

Seconds, minutes, hours, days, and weeks convert using fixed ratios. Because months and years don't have a single fixed length, this converter uses average calendar values — a 365.2425-day year and a 30.44-day month — so results stay consistent across the whole calendar rather than assuming every month is exactly 30 days.

Common uses

• Converting a duration in seconds into more readable hours or days
• Estimating how many weeks or months a given number of days represents
• Quick sanity checks when comparing durations expressed in different units