Time Converter
Convert between seconds, minutes, hours, days, and years.
Quick reference
- 1 minute = 60 seconds
- 1 hour = 3,600 seconds
- 1 day = 86,400 seconds
- 1 week = 604,800 seconds
- 1 average month ≈ 30.4 days
- 1 year ≈ 365.25 days
About this converter
A plain converter between time units from milliseconds up through years, mostly useful for turning a duration in seconds into something you can actually picture, or figuring out how many hours are in a stretch of days.
Worth knowing going in: a "month" isn't a fixed length of time, so this converter uses an average (about 30.4 days) based on the length of a calendar year divided by 12. That's fine for rough duration math, converting "about 90 days" into "about 3 months," but it will drift if you need the exact number of days in a specific named month, since those range from 28 to 31.
Frequently asked questions
- How is a "month" defined here, since months vary in length?
- As an average month, roughly 30.4 days, since calendar months genuinely aren't a fixed duration. This is meant for rough duration conversion (turning a number of days into an approximate number of months), not for exact calendar arithmetic.
- Why do we even have a 7-day week?
- It's not tied to anything astronomical the way the day or year is, it comes from ancient tradition (Babylonian and later biblical). France actually tried replacing it with a 10-day week during the Revolution, in the name of decimalizing everything. It lasted about 12 years before getting abandoned.
- Why does the year have leap years?
- Because a real solar year is about 365.24 days, not a round 365. Leap years add the missing quarter-day back roughly every four years so the calendar doesn't slowly drift out of sync with the seasons.
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