Millennia to Microseconds (ky to µs)

1 millennium equals 3.1556952×10¹⁶ microseconds exactly.

1 millennium = 3.1556952×10¹⁶ microseconds

How to convert millennia to microseconds

To convert millennia to microseconds, multiply the number of millennia by 3.1556952×10¹⁶. This factor is exact. To go the other way, multiply microseconds by 3.168873851×10⁻¹⁷ (rounded).

microseconds = millennia × 3.1556952×10¹⁶

Example: 10 millennia = 3.1556952×10¹⁷ microseconds.

Months and years are not constant. This site uses the average Gregorian year of 365.2425 days, so one 'year' converts to 365.2425 days, not 365; use 'common year' for exactly 365 days.

About these units

Millennium (ky)

CalendarCurrent unit

One thousand years.

Latin supplied the parts of millennium: mille, a thousand, and annus, a year. The plural can be millennia or millenniums. Because a thousand years exceeds any one person's reach, the word acquired religious overtones in the idea of millenarianism, though the unit itself is a plain count of years. When the year 2000 arrived, a new question came with it: was this the start of the third millennium, or was that a year away?

A millennium is 1,000 years, here 1,000 average Gregorian years. The 2001 camp points out that there is no year zero, so the first millennium ran from year 1 to year 1000. The 2000 camp followed the odometer effect, in which the hundreds and thousands digits roll over together. Most people celebrated in 2000, and the celebrations in 2001 were mostly routine, although the U.S. Naval Observatory, Cuba and Japan did mark the strict date. The evolutionary biologist Stephen Jay Gould observed that the strict view dominated at the start of the 20th century and the popular view at its end.

1 millennium = 31,556,952,000 seconds (exactly).

Sources: Wikipedia: Millennium; Wikipedia: Millenarianism

Microsecond (µs)

Metric (SI)Current unit

One millionth of a second. Used for electronics and processor timing.

Writing a microsecond takes a Greek letter, mu, which stands for the prefix micro-, one millionth. Where plain text cannot display it, people fall back on the letter u and write us. The unit belongs to electronics and radio: a signal that repeats every microsecond has a frequency of 1 MHz, and a radio wave of that period is about 300 m long.

A microsecond is one millionth of a second, short enough that light in a vacuum crosses only about 1 km in 3.34 of them. Digital audio lives on this scale, because a CD sample at 44.1 kHz lasts about 22.7 microseconds and a 48 kHz sample about 20.8. A modern solid-state drive has an access latency of about 50 microseconds, and a camera flash lasts around 1,000. Relativity matters at this scale too: GPS satellite clocks would drift by about 38 microseconds per day without compensation. Wikipedia notes that the 2011 Japanese earthquake shortened the day by about 1.8 microseconds.

1 microsecond = 0.000001 seconds (exactly).

Sources: Wikipedia: Microsecond; BIPM: SI Brochure, 9th edition

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