Time converter

The second is the SI base unit of time, and every other duration on this page is defined as a fixed multiple of it: a minute is 60 s, an hour is 3,600 s, a day is 86,400 s, and a year (365 days) is 31,536,000 s. A few units go the other direction, down to a nanosecond (a billionth of a second) or a picosecond (a trillionth), and the Planck time sits at an almost incomprehensibly small 5.391247 × 10⁻⁴⁴ s.

The default pairing is hour to minute. Multiply by 60 to go from hour to minute:

min = h × 60

Reverse it by dividing by 60 (the same as multiplying by 0.01666666667). A 2.5-hour flight lasts 2.5 × 60 = 150 min, and a 90-minute meeting block is 90 ÷ 60 = 1.5 h.

Smaller time units matter most where speed itself is the thing being measured: computer processors and network latency are benchmarked in nanoseconds and microseconds, and nuclear physics experiments use the shake (10 nanoseconds) to describe reaction speeds. Everyday scheduling runs on minutes, hours, and days. Finance, history, and demographics work in decades and centuries. Astronomy needs its own precision at the long end, which is why this page distinguishes a plain calendar year (365 days) from a Julian year (365.25 days) and a tropical year (365.24219 days) — the actual time it takes Earth to complete one orbit relative to the seasons.

The trickiest unit here is the month, because unlike every other unit on this page, a real calendar month doesn't have one fixed length — it runs anywhere from 28 to 31 days depending on which month and whether it's a leap year. This converter uses a flat 30-day month as a practical approximation (and a separate “average month” based on the true average calendar month), but either one can be off by a day or two compared with a specific real month, so for contract terms, billing cycles, or legal deadlines, always confirm against an actual calendar rather than relying on a converted duration.