Time Converter

How to use it

Time is the one category where every unit — from milliseconds up to weeks — has an exact, universally agreed relationship to the second, the SI base unit. A minute is exactly 60 seconds, an hour is exactly 3,600 seconds (60 × 60), a day is exactly 86,400 seconds (24 × 3,600), and a week is exactly 604,800 seconds (7 × 86,400). None of these are approximations, which makes time conversions some of the cleanest math on this whole page. Converting is straightforward multiplication or division through seconds: 2.5 hours to minutes is 2.5 × 60 = 150 minutes; 10,000 seconds to hours is 10,000 ÷ 3,600 ≈ 2.78 hours. A work shift of 480 minutes converts to 480 ÷ 60 = 8 hours, and a 3-day trip is 3 × 86,400 = 259,200 seconds. The one wrinkle is the year, which isn't included as a fixed unit here because it isn't a fixed number of days — a calendar year is 365 days, but the Earth actually takes about 365.2422 days to orbit the sun, which is why leap years exist. The commonly used approximation is 365.25 days per year (accounting for one extra day roughly every 4 years), which is accurate enough for financial and scheduling calculations but drifts slightly over centuries — it's why leap years are skipped in years divisible by 100 but not 400 (2000 was a leap year, 1900 was not), keeping the calendar aligned with the actual solar year. For anything that needs to track real calendar dates rather than a fixed duration, use a date calculator instead of a duration-based year conversion, since months and years don't have a constant length in days.

Frequently asked questions

How many seconds are in a day?

Exactly 86,400 seconds (24 hours × 60 minutes × 60 seconds). This is a fixed, universal conversion with no rounding — every calendar day (ignoring the rare leap second) contains exactly this many seconds, which makes it a reliable base for scheduling and duration calculations.

Why isn't a year included as a fixed conversion unit?

Because a year isn't a constant number of days — a calendar year is 365 days, but a leap year is 366, and the actual solar year is about 365.2422 days. Rather than pick one imprecise number, this tool treats 'year' as a calendar concept, not a fixed duration like an hour or day.

What is a leap second, and does it affect these conversions?

A leap second is an occasional extra second added to clock time to keep it aligned with the Earth's slightly irregular rotation — unrelated to leap years. It affects official atomic-clock timekeeping, not everyday duration conversions like the ones here, which assume a constant 86,400 seconds per day.

How do I convert minutes into hours and minutes (like 150 minutes into 2h 30m)?

Divide by 60 to get whole hours, then multiply the remainder by 60 for leftover minutes: 150 ÷ 60 = 2 remainder 30, so 150 minutes is 2 hours 30 minutes. This converter shows the decimal value (2.5 hours); splitting it into hours-and-minutes is a quick manual step from there.