Microseconds to Days (µs to d)
1 microsecond equals 1.157407407×10⁻¹¹ days (rounded).
How to convert microseconds to days
To convert microseconds to days, multiply the number of microseconds by 1.157407407×10⁻¹¹. The factor is rounded to 10 significant digits. To go the other way, multiply days by 86,400,000,000.
days = microseconds × 1.157407407×10⁻¹¹
Example: 10 microseconds = 1.157407407×10⁻¹⁰ days.
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
Microsecond (µs)
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
Day (d)
24 hours or 86,400 seconds. The mean solar day; the actual rotation of the Earth is about 4 minutes shorter (see sidereal day).
Old English dæg is the root of our day, with close cousins in German Tag, Dutch dag and Icelandic dagur, all descending from Proto-Germanic dagaz. It is the oldest unit here, because the cycle of light and dark needs no instrument. Yet the day we count is a constructed average: the actual interval from one noon to the next varies through the year by up to about 7.9 seconds, because Earth's orbit is elliptical and its axis is tilted.
Astronomers smooth this out with a fictitious mean Sun, giving the mean solar day, and the day in the SI sense is fixed at exactly 86,400 seconds. Reality has drifted slightly: the mean solar day has recently averaged about 86,400.002 seconds, and tidal drag from the Moon is lengthening it by about 2 milliseconds per century. That is why 27 leap seconds were added to UTC between 1972 and 2022. One rotation measured against the distant stars is shorter, about 23 hours 56 minutes 4.09 seconds, and a year contains one more of these sidereal days than solar days.
1 day = 86,400 seconds (exactly).
Sources: Wikipedia: Day; BIPM: SI Brochure, 9th edition
Related conversions
- Days to microseconds (reverse)
- Microseconds to seconds
- Microseconds to minutes
- Microseconds to hours
- Microseconds to weeks
- Microseconds to months
- Microseconds to years
- Microseconds to milliseconds
- Microseconds to nanoseconds
- Microseconds to decades
- Microseconds to centuries
- Microseconds to millennia
- Seconds to days
- Minutes to days
- Hours to days
- Weeks to days
- Months to days
- Years to days
- Milliseconds to days
- Nanoseconds to days
- Decades to days
- Centuries to days
- Millennia to days
- Picoseconds to days
See all time units.