Days to Picoseconds (d to ps)
1 day equals 8.64×10¹⁶ picoseconds exactly.
How to convert days to picoseconds
To convert days to picoseconds, multiply the number of days by 8.64×10¹⁶. This factor is exact. To go the other way, multiply picoseconds by 1.157407407×10⁻¹⁷ (rounded).
picoseconds = days × 8.64×10¹⁶
Example: 10 days = 8.64×10¹⁷ picoseconds.
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
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
Picosecond (ps)
One trillionth of a second. Used for very fast electronics.
Pico comes from SI prefix naming and stands for 10 to the power of minus 12, so a picosecond is one trillionth of a second. The BIPM and NIST prefix tables both list it with the symbol p, and the unit is written ps. It is an exact decimal fraction with no historical variation, which is why the factor used here carries no uncertainty.
Picoseconds matter where signals and molecules move too fast for milliseconds or nanoseconds to be useful. Light in a vacuum travels about 0.30 mm in one picosecond, so a millimetre takes roughly 3.3 ps. A 1 THz electromagnetic wave has a cycle time of 1.0 ps, the unit interval of a 10 Gbit/s serial link is 100 ps, and a 3.0 GHz processor cycle lasts about 330 ps. Streak cameras can resolve events on single-digit picosecond timescales, and Wikipedia lists the lifetime of a hydronium ion in water as about 1 ps. A picosecond is one thousandth of a nanosecond.
1 picosecond = 1×10⁻¹² seconds (exactly).
Sources: Wikipedia: Picosecond; BIPM: SI prefixes; NIST: Metric (SI) prefixes
Related conversions
- Picoseconds to days (reverse)
- Days to seconds
- Days to minutes
- Days to hours
- Days to weeks
- Days to months
- Days to years
- Days to milliseconds
- Days to microseconds
- Days to nanoseconds
- Days to decades
- Days to centuries
- Days to millennia
- Seconds to picoseconds
- Minutes to picoseconds
- Hours to picoseconds
- Weeks to picoseconds
- Months to picoseconds
- Years to picoseconds
See all time units.