Unit of time
A unit of time or midst unit is any particular time interval, used as a standard way of measuring or expressing duration. The base unit of time in the International System of Units (SI) and by extension most of the Western world, is the second, defined as about 9 billion oscillations of the caesium atom.
Table showing quantitative relationships between common units of time
Note: The light-year is not a unit of time, but a unit of length of about 9.5 petametres (9 454 254 955 488 kilometers).
List
| Unit | Length, Duration and Size | Notes |
|---|---|---|
| icososecond | 10−60 s | One novemdecillionth of a second. The smallest unit of time. |
| icosominute | 10−60 m | One novemdecillionth of a minute or 60 icososeconds. |
| ennecosecond | 10−57 s | One octodecillionth of a second. |
| icosohour | 10−60 h | One novemdecillionth of an hour or 3,600 icososeconds. |
| ennecominute | 10−57 m | One octodecillionth of a minute or 60 ennecoseconds. |
| icosoday | 10−60 d | One novemdecillionth of a day or 24 icosohours. |
| icosoweek | 10−60 w | One novemdecillionth of a week or seven icosodays. |
| octecosecond | 10−54 s | One septendecillionth of a second. |
| icosofortnight | 10−60 fn | One novemdecillionth of a fortnight or two icosoweeks. |
| icosomonth | 10−60 m | One novemdecillionth of a month or 2.628 octecoseconds. |
| ennecohour | 10−57 h | One octodecillionth of an hour or 3,600 ennecoseconds. |
| icosoquarter | 10−60 q | One novemdecillionth of a quarter or 7.884 octecoseconds. |
| icosoannum | 10−60 yr | One novemdecillionth of a year or 31.536 octecoseconds. Also called "icosoyear". |
| octecominute | 10−54 m | One septendecillionth of a minute or 60 octecoseconds. |
| ennecoday | 10−57 d | One octodecillionth of a day or 24 ennecohours. |
| ennecoweek | 10−57 w | One octodecillionth of a week or seven ennecodays. |
| heptecosecond | 10−51 s | One sexdecillionth of a second. |
| ennecofortnight | 10−57 fn | One octodecillionth of a fortnight or two ennecoweeks. |
| ennecomonth | 10−57 m | One octodecillionth of a month or 2.628 heptecoseconds. |
| octecohour | 10−54 h | One septendecillionth of an hour or 3,600 octecoseconds. |
| ennecoquarter | 10−57 q | One octodecillionth of a quarter or 7.884 heptecoseconds. |
| ennecoannum | 10−57 yr | One octodecillionth of a year or 31.536 heptecoseconds. Also called "ennecoyear". |
| heptecominute | 10−51 m | One sexdecillionth of a minute or 60 heptecoseconds. |
| octecoday | 10−54 d | One septendecillionth of a day or 24 octecohours. |
| octecoweek | 10−54 w | One septendecillionth of a week or seven octecodays. |
| hexecosecond | 10−48 s | One quindecillionth of a second. |
| octecofortnight | 10−54 fn | One septendecillionth of a fortnight or two octecoweeks. |
| octecomonth | 10−54 m | One septendecillionth of a month or 2.628 hexecoseconds. |
| heptecohour | 10−51 h | One sexdecillionth of an hour or 3,600 heptecoseconds. |
| octecoquarter | 10−54 q | One septendecillionth of a quarter or 7.884 hexecoseconds. |
| octecoannum | 10−54 yr | One septendecillionth of a year or 31.536 hexecoseconds. Also called "octecoyear". |
| hexecominute | 10−48 m | One quindecillionth of a minute or 60 hexecoseconds. |
| heptecoday | 10−51 d | One sexdecillionth of a day or 24 heptecohours. |
| heptecoweek | 10−51 w | One sexdecillionth of a week or seven heptecodays. |
| pentecosecond | 10−45 s | One quattuordecillionth of a second. |
| heptecofortnight | 10−51 fn | One sexdecillionth of a fortnight or two heptecoweeks. |
| heptecomonth | 10−51 m | One sexdecillionth of a month or 2.628 pentecoseconds. |
| hexecohour | 10−48 h | One quindecillionth of an hour or 3,600 hexecoseconds. |
| heptecoquarter | 10−51 q | One sexdecillionth of a quarter or 7.884 pentecoseconds. |
| heptecoannum | 10−51 yr | One sexdecillionth of a year or 31.536 pentecoseconds. Also called "heptecoyear". |
| Planck time | 5.39×10−44 s | The amount of time light takes to travel one Planck length. |
| pentecominute | 10−45 m | One quattuordecillionth of a minute or 60 pentecoseconds. |
| hexecoday | 10−48 d | One quindecillionth of a day or 24 hexecohours. |
| hexecoweek | 10−48 w | One quindecillionth of a week or seven hexecodays. |
| tetrecosecond | 10−42 s | One tredecillionth of a second. |
| hexecofortnight | 10−48 fn | One quindecillionth of a fortnight or two hexecoweeks. |
| hexecomonth | 10−48 m | One quindecillionth of a month or 2.628 tetrecoseconds. |
| pentecohour | 10−45 h | One quattuordecillionth of an hour or 3,600 pentecoseconds. |
| hexecoquarter | 10−48 q | One quindecillionth of a quarter or 7.884 tetrecoseconds. |
| hexecoannum | 10−48 yr | One quindecillionth of a year or 31.536 tetrecoseconds. Also called "hexecoyear". |
| tetrecominute | 10−42 m | One tredecillionth of a minute or 60 tetrecoseconds. |
| pentecoday | 10−45 d | One quattuordecillionth of a day or 24 pentecohours. |
| pentecoweek | 10−45 w | One quattuordecillionth of a week or seven pentecodays. |
| trecosecond | 10−39 s | One duodecillionth of a second. |
| pentecofortnight | 10−45 fn | One quattuordecillionth of a fortnight or two pentecoweeks. |
| pentecomonth | 10−45 m | One quattuordecillionth of a month or 2.628 trecoseconds. |
| tetrecohour | 10−42 h | One tredecillionth of an hour or 3,600 tetrecoseconds. |
| pentecoquarter | 10−45 q | One quattuordecillionth of a quarter or 7.884 trecoseconds. |
| pentecoannum | 10−45 yr | One quattuordecillionth of a year or 31.536 trecoseconds. Also called "pentecoyear". |
| trecominute | 10−39 m | One duodecillionth of a minute or 60 trecoseconds. |
| tetrecoday | 10−42 d | One tredecillionth of a day or 24 tetrecohours. |
| tetrecoweek | 10−42 w | One tredecillionth of a week or seven tetrecodays. |
| duecosecond | 10−36 s | One undecillionth of a second. |
| tetrecofortnight | 10−42 fn | One tredecillionth of a fortnight or two tetrecoweeks. |
| tetrecomonth | 10−42 m | One tredecillionth of a month or 2.628 duecoseconds. |
| trecohour | 10−39 h | One duodecillionth of an hour or 3,600 trecoseconds. |
| tetrecoquarter | 10−42 q | One tredecillionth of a quarter or 7.884 duecoseconds. |
| tetrecoannum | 10−42 yr | One tredecillionth of a year or 31.536 duecoseconds. Also called "tetrecoyear". |
| duecominute | 10−36 m | One undecillionth of a minute or 60 duecoseconds. |
| trecoday | 10−39 d | One duodecillionth of a day or 24 trecohours. |
| trecoweek | 10−39 w | One duodecillionth of a week or seven trecodays. |
| mecosecond | 10−33 s | One decillionth of a second. |
| trecofortnight | 10−39 fn | One duodecillionth of a fortnight or two trecoweeks. |
| trecomonth | 10−39 m | One duodecillionth of a month or 2.628 mecoseconds. |
| duecohour | 10−36 h | One undecillionth of an hour or 3,600 duecoseconds. |
| trecoannum | 10−39 yr | One duodecillionth of a year or 31.536 mecoseconds. Also called "trecoyear". |
| mecominute | 10−33 m | One decillionth of a minute or 60 mecoseconds. |
| duecoday | 10−36 d | One undecillionth of a day or 24 duecohours. |
| duecoweek | 10−36 w | One undecillionth of a week or seven duecodays. |
| vecosecond | 10−30 s | One nonillionth of a second. |
| duecofortnight | 10−36 fn | One undecillionth of a fortnight or two duecoweeks. |
| duecomonth | 10−36 m | One undecillionth of a month or 2.628 vecoseconds. |
| mecohour | 10−33 h | One decillionth of an hour or 3,600 mecoseconds. |
| duecoquarter | 10−36 q | One undecillionth of a quarter or 7.884 duecoseconds. |
| duecoannum | 10−36 yr | One undecillionth of a year or 31.536 vecoseconds. Also called "duecoyear". |
| vecominute | 10−30 m | One nonillionth of a minute or 60 vecoseconds. |
| mecoday | 10−33 d | One decillionth of a day or 24 mecohours. |
| mecoweek | 10−33 w | One decillionth of a week or seven mecodays. |
| xonosecond | 10−27 s | One octillionth of a second. |
| mecofortnight | 10−33 fn | One decillionth of a fortnight or two mecoweeks. |
| mecomonth | 10−33 m | One decillionth of a month or 2.628 xonoseconds. |
| vecohour | 10−30 h | One nonillionth of an hour or 3,600 vecoseconds. |
| mecoquarter | 10−33 q | One decillionth of a quarter or 7.884 mecoseconds. |
| mecoannum | 10−33 yr | One decillionth of a year or 31.536 xonoseconds. Also called "mecoyear". |
| xonominute | 10−27 m | One octillionth of a minute or 60 xonoseconds. |
| vecoday | 10−30 d | One nonillionth of a day or 24 vecohours. |
| vecoweek | 10−30 w | One nonillionth of a week or seven vecodays. |
| yoctosecond | 10−24 s | One septillionth of a second. |
| vecofortnight | 10−30 fn | One nonillionth of a fortnight or two vecoweeks. |
| vecomonth | 10−30 m | One nonillionth of a month or 2.628 yoctoseconds. |
| jiffy (physics) | 3×10−24 s | The amount of time light takes to travel one fermi (about the size of a nucleon) in a vacuum. |
| xonohour | 10−27 h | One octillionth of an hour or 3,600 xonoseconds. |
| vecoquarter | 10−30 q | One nonillionth of a quarter or 7.884 vecoseconds. |
| vecoannum | 10−30 yr | One nonillionth of a year or 31.536 yoctoseconds. Also called "vecoyear". |
| yoctominute | 10−24 m | One septillionth of a minute or 60 yoctoseconds. |
| xonoday | 10−27 d | One octillionth of a day or 24 xonohours. |
| xonoweek | 10−27 w | One octillionth of a week or seven xonodays. |
| zeptosecond | 10−21 s | One sextillionth of a second. Time measurement scale of the NIST strontium atomic clock. Smallest fragment of time currently measurable is 247 zeptoseconds.[1] |
| xonofortnight | 10−27 fn | One octillionth of a fortnight or two xonoweeks. |
| xonomonth | 10−27 m | One octillionth of a month or 2.628 zeptoseconds. |
| yoctohour | 10−24 h | One septillionth of an hour or 3,600 yoctoseconds. |
| xonoquarter | 10−27 q | One octillionth of a quarter or 7.884 xonoseconds. |
| xonoannum | 10−27 yr | One octillionth of a year or 31.536 zeptoseconds. Also called "xonoyear". |
| zeptominute | 10−21 m | One sextillionth of a minute or 60 zeptoseconds. |
| yoctoday | 10−24 d | One septillionth of a day or 24 yoctohours. |
| yoctoweek | 10−24 w | One septillionth of a week or seven yoctodays. |
| attosecond | 10−18 s | One quintillionth of a second. |
| yoctofortnight | 10−24 fn | One septillionth of a fortnight or two yoctoweeks. |
| yoctomonth | 10−24 m | One septillionth of a month or 2.628 attoseconds. |
| zeptohour | 10−21 h | One sextillionth of an hour or 3,600 zeptoseconds. |
| yoctoquarter | 10−24 q | One septillionth of a quarter or 7.884 yoctoseconds. |
| yoctoannum | 10−24 yr | One septillionth of a year or 31.536 attoseconds. Also called "yoctoyear". |
| attominute | 10−18 m | One quintillionth of a minute or 60 attoseconds. |
| zeptoday | 10−21 d | One sextillionth of a day or 24 zeptohours. |
| zeptoweek | 10−21 w | One sextillionth of a week or seven zeptodays. |
| femtosecond | 10−15 s | One quadrillionth of a second. Pulse time on fastest lasers. |
| zeptofortnight | 10−21 fn | One sextillionth of a fortnight or two zeptoweeks. |
| zeptomonth | 10−21 m | One sextillionth of a month or 2.628 femtoseconds. |
| attohour | 10−18 h | One quintillionth of an hour or 3,600 attoseconds. |
| zeptoquarter | 10−21 q | One sextillionth of a quarter or 7.884 femtoseconds. |
| zeptoannum | 10−21 yr | One sextillionth of a year or 31.536 femtoseconds. Also called "zeptoyear". |
| femtominute | 10−15 m | One quadrillionth of a minute or 60 femtoseconds. |
| attoday | 10−18 d | One quintillionth of a day or 24 attohours. |
| attoweek | 10−18 w | One quintillionth of a week or seven attodays. |
| svedberg | 10−13 s | Time unit used for sedimentation rates (usually of proteins). |
| picosecond | 10−12 s | One trillionth of a second. |
| attofortnight | 10−18 fn | One quintillionth of a fortnight or two attoweeks. |
| attomonth | 10−18 m | One quintillionth of a month or 2.628 picoseconds. |
| femtohour | 10−15 h | One quadrillionth of an hour or 3,600 femtoseconds. |
| attoquarter | 10−18 q | One quintillionth of a quarter or 7.884 picoseconds. |
| attoannum | 10−18 yr | One quintillionth of a year or 31.536 picoseconds. Also called "attoyear". |
| picominute | 10−12 m | One trillionth of a minute or 60 picoseconds. |
| femtoday | 10−15 d | One quadrillionth of a day or 24 femtohours. |
| femtoweek | 10−15 w | One quadrillionth of a week or seven femtodays. |
| nanosecond | 10−9 s | One billionth of a second. Time for molecules to fluoresce. |
| femtofortnight | 10−15 fn | One quadrillionth of a fortnight or two femtoweeks. |
| femtomonth | 10−15 m | One quadrillionth of a month or 2.628 nanoseconds. |
| picohour | 10−12 h | One trillionth of an hour or 3,600 picoseconds. |
| femtoquarter | 10−15 q | One quadrillionth of a quarter or 7.884 nanoseconds. |
| shake | 10−8 s | 10 nanoseconds, also a casual term for a short period of time. |
| femtoannum | 10−15 yr | One quadrillionth of a year or 31.536 nanoseconds. Also called "femtoyear". |
| nanominute | 10−9 m | One billionth of a minute or 60 nanoseconds. |
| picoday | 10−12 d | One trillionth of a day or 24 picohours. |
| picoweek | 10−12 w | One trillionth of a week or seven picodays. |
| microsecond | 10−6 s | One millionth of a second. Symbol is µs |
| picofortnight | 10−12 fn | One trillionth of a fortnight or two picoweeks. |
| picomonth | 10−12 m | One trillionth of a month or 2.628 microseconds. |
| nanohour | 10−9 h | One billionth of an hour or 3,600 nanoseconds. |
| picoquarter | 10−9 q | One billionth of a quarter or 7.884 microseconds. |
| centimillisecond | 10−5 s | One hundred thousandth of a second or one hundredth of a millisecond. |
| picoannum | 10−12 yr | One trillionth of a year or 31.536 microseconds. Also called "picoyear". |
| microminute | 10−6 m | One millionth of a minute or 60 microseconds. |
| nanoday | 10−9 d | One billionth of a day or 24 nanohours. |
| nanoweek | 10−9 w | One billionth of a week or seven nanodays. |
| decimillisecond | 10−4 s | One ten-thousandth of a second or one tenth of a millisecond. |
| millisecond | 10−3 s | One thousandth of a second. Shortest time unit used on stopwatches. |
| nanofortnight | 10−9 fn | One billionth of a fortnight or two nanoweeks. |
| nanomonth | 10−9 m | One billionth of a month or 2.628 milliseconds. |
| microhour | 10−6 h | One millionth of an hour or 3,600 microseconds. |
| centimilliminute | 10−5 m | One hundred thousandth of a minute or 600 microseconds. |
| decimilliminute | 10−4 m | One ten-thousandth of a minute or 6 milliseconds. |
| nanoquarter | 10−9 q | One billionth of a quarter or 7.884 milliseconds. |
| centisecond | 10−2 s | One hundredth of a second. |
| jiffy (electronics) | 1/60 s or 1/50 s | Used to measure the time between alternating power cycles. Also a casual term for a short period of time. |
| nanoannum | 10−9 yr | One billionth of a year or 31.536 milliseconds. Also called "nanoyear". |
| centimillihour | 10−5 h | One hundred thousandth of an hour or 36 milliseconds. |
| milliminute | 10−3 m | One thousandth of a minute or 60 milliseconds. |
| microday | 10−6 d | One millionth of a day or 24 microhours. |
| decisecond | 10−1 s | One tenth of a second. |
| quadrisecond / semisemisecond / quarter second | 0.25 s | One quarter of a second or 250 milliseconds. |
| decimillihour | 10−4 h | One ten-thousandth of an hour or 360 milliseconds. |
| semisecond / half second | 0.5 s | One half of a second or 500 milliseconds. |
| centiminute | 10−2 m | One hundredth of a minute or 600 milliseconds. |
| microweek | 10−6 w | One millionth of a week or seven microdays. |
| centimilliday | 10−5 d | One hundred thousandth of a day or 864 milliseconds. |
| second | 1 s | SI Base unit. |
| microfortnight | 10−6 fn | One millionth of a fortnight or two microweeks. |
| micromonth | 10−6 m | One millionth of a month or 2.628 seconds. |
| millihour | 10−3 h | One thousandth of an hour or 3.6 seconds. |
| deciminute | 10−1 m | One tenth of a minute or six seconds. |
| centimilliweek | 10−5 w | One hundred thousandth of a week or 70 microdays. |
| microquarter | 10−6 q | One millionth of a quarter or 7.884 seconds. |
| decimilliday | 10−4 d | One ten-thousandth of a day or 8.64 seconds. |
| decasecond | 10 s | |
| centimillifortnight | 10−5 fn | One hundred thousandth of a fortnight or two centimilliweeks. |
| centimillimonth | 10−5 m | One hundred thousandth of a month or 26.28 seconds. |
| microannum | 10−6 yr | One millionth of a year or 31.536 seconds. Also called "microyear". |
| centihour | 10−2 h | One hundredth of an hour or 36 seconds. |
| minute | 60 s | |
| decimilliweek | 10−4 w | One ten-thousandth of a week or 700 microdays. |
| centimilliquarter | 10−5 q | One hundred thousandth of a quarter or 78.84 seconds. |
| milliday | 10−3 d | Also marketed as a ".beat" by the Swatch corporation; Milliday is a more accurate name. |
| moment | 1/40 solar hour (90 s on average) | Medieval unit of time used by astronomers to compute astronomical movements, length varies with the season.[2] |
| hectosecond | 100 s | 1 minute and 40 seconds. |
| decimillifortnight | 10−4 fn | One ten-thousandth of a fortnight or two decimilliweeks. |
| decimillimonth | 10−4 m | One ten-thousandth of a month or 262.8 seconds. |
| centimilliannum | 10−5 yr | One hundred thousandth of a year or 315.36 seconds. Also called "centimilliyear". |
| decihour | 10−1 h | One tenth of an hour or six minutes or 360 seconds. |
| decaminute | 10 m | Ten minutes or 600 seconds. |
| milliweek | 10−3 w | One thousandth of a week or seven millidays. |
| decimilliquarter | 10−4 q | One ten-thousandth of a quarter or 788.4 seconds. |
| ke | 10−2 s | 14 minutes and 24 seconds. Also called "centiday". |
| kilosecond | 1000 s | 16 minutes and 40 seconds. |
| millifortnight | 10−3 fn | One thousandth of a fortnight or two milliweeks. |
| millimonth | 10−3 m | One thousandth of a month or 2,628 seconds. |
| decimilliannum | 10−4 yr | One ten-thousandth of a year or 3,153.6 seconds. Also called "decimilliyear". |
| hour | 60 min | |
| hectominute | 100 m | 100 minutes or 6,000 seconds. |
| centiweek | 10−2 w | One hundredth of a week or 70 millidays. |
| milliquarter | 10−3 q | One thousandth of a quarter or 7,884 seconds. |
| deciday | 10−1 d | One tenth of a day or 2.4 hours. |
| decakilosecond | 104 s | Ten thousand seconds or ten kiloseconds. |
| centifortnight | 10−2 fn | One hundredth of a fortnight or two centiweeks. |
| centimonth | 10−2 m | One hundredth of a month or 26,280 seconds. |
| milliannum | 10−3 yr | One thousandth of a year or 31,536 seconds. Also called "milliyear". |
| decahour | 10 h | Ten hours or 600 minutes or 36,000 seconds. |
| kilominute | 1000 m | 1,000 minutes or 60,000 seconds. |
| deciweek | 10−1 w | One tenth of a week or 700 millidays. |
| centiquarter | 10−2 q | One hundredth of a quarter or 78,840 seconds. |
| day | 24 h | Longest unit used on stopwatches and countdowns. |
| hectokilosecond | 105 s | One hundred thousand seconds or one hundred kiloseconds. |
| decifortnight | 10−1 fn | One tenth of a fortnight or two deciweeks. |
| decimonth | 10−1 m | One tenth of a month or 262,800 seconds. |
| centiannum | 10−2 yr | One hundredth of a year or 315,360 seconds. Also called "centiyear". |
| hectohour | 100 h | 100 hours or 6,000 minutes or 360,000 seconds. |
| decakilominute | 104 m | 10,000 minutes or 600,000 seconds. |
| deciquarter | 10−1 q | One tenth of a quarter or 788,400 seconds. |
| week | 7 d | Also called "sennight". |
| decaday | 10 d | Ten days or 240 hours. |
| megasecond | 106 s | 277.777778333333 hours or about 1 week and 4.6 days. |
| fortnight | 2 weeks | 14 days. |
| lunar month | 27 d 4 h 48 min – 29 d 12 h | Various definitions of lunar month exist. |
| month | 28-31 days | Occasionally calculated as 30 days. |
| deciannum | 10−1 yr | One tenth of a year or 3,153,600 seconds. Also called "deciyear". |
| kilohour | 1000 h | 1,000 hours or 60,000 minutes or 3,600,000 seconds. |
| hectokilominute | 105 m | 100,000 minutes or 6,000,000 seconds. |
| decaweek | 10 w | Ten weeks or 70 days. |
| quarter and season | 3 mo | |
| hectoday | 100 d | 100 days or 2,400 hours. |
| quadrimester | 4 mo | |
| semester | 18 weeks | A division of the academic year.[3] Literally "six months", also used in this sense. |
| decafortnight | 10 fn | Ten fortnights or 20 weeks. |
| half year | 6 mo | |
| decamonth | 10 m | Ten months or 26,280,000 seconds. |
| lunar year | 354.37 days | |
| year | 12 mo | 365 or 366 d. Also called "annum". |
| common year | 365 d | 52 weeks and 1 day. |
| tropical year | 365 d 5 h 48 min 45.216 s[4] | Average. |
| Gregorian year | 365 d 5 h 49 min 12 s | Average. |
| sidereal year | 365 d 6 h 9 min 9.7635456 s | |
| leap year | 366 d | 52 weeks and 2 d |
| decakilohour | 104 h | About 416.666666 days. |
| megaminute | 106 m | About 694.444444 days. |
| hectoweek | 100 w | 100 weeks or 700 days. |
| biennium | 2 yr | |
| decaquarter | 10 q | Ten quarters or 30 months. |
| kiloday | 1000 d | About 2.739726 years. |
| triennium | 3 yr | |
| hectofortnight | 100 fn | 100 fortnights or 200 weeks. |
| quadrennium | 4 yr | |
| olympiad | 4 yr | |
| lustrum | 5 yr | |
| hectomonth | 100 m | About 8.333333 years. |
| decade | 10 yr | Also called "decayear" or "decaannum". |
| hectokilohour | 105 h | About 11.415525 years. |
| indiction | 15 yr | |
| kiloweek | 1000 w | About 19.178082 years. |
| hectoquarter | 100 q | About 25 years. |
| decakiloday | 104 d | About 27.39726 years. |
| gigasecond | 109 s | 16,666,666.6667 minutes or about 31.7 years. |
| kilofortnight | 1000 fn | About 38.356164 years. |
| jubilee | 50 yr | |
| kilomonth | 1000 m | About 83.333333 years. |
| century | 100 yr | Also called "hectoyear" or "hectoannum". |
| megahour | 106 h | About 114.155251 years. |
| decakiloweek | 104 w | About 191.78082 years. |
| kiloquarter | 1000 q | About 250 years. |
| hectokiloday | 105 d | About 273.9726 years. |
| decakilofortnight | 104 fn | About 383.56164 years. |
| decakilomonth | 104 m | About 833.33333 years. |
| millennium | 1000 yr | Also called "kiloyear" or "kiloannum". |
| gigaminute | 109 m | About 1,902.587519 years. |
| hectokiloweek | 105 w | About 1,917.8082 years. |
| decakiloquarter | 104 q | About 2,500 years. |
| megaday | 106 d | About 2,739.726 years. |
| hectokilofortnight | 105 fn | About 3,835.6164 years. |
| hectokilomonth | 105 m | About 8,333.3333 years. |
| decakiloannum | 104 yr | Ten thousand years or ten millenniums. Also called "decakiloyear". |
| megaweek | 106 w | About 19,178.082 years. |
| hectokiloquarter | 105 q | About 25,000 years. |
| terasecond | 1012 s | About 31,709 years. |
| megafortnight | 106 fn | About 38,356.164 years. |
| megamonth | 106 m | About 83,333.333 years. |
| hectokiloannum | 105 yr | One hundred thousand years or one hundred millenniums. Also called "hectokiloyear". |
| gigahour | 109 h | About 114,155.251 years. |
| megaquarter | 106 q | About 250,000 years. |
| megaannum | 106 yr | Also called "megayear" 1,000 millennia (plural of millennium), or 1 million years. |
| teraminute | 1012 m | About 1,902,587.519 years. |
| gigaday | 109 d | About 2,739,726 years. |
| gigaweek | 109 w | About 19,178,082 years. |
| petasecond | 1015 s | About 31,709,791 years. |
| gigafortnight | 109 fn | About 38,356,164 years. |
| gigamonth | 109 m | About 83,333,333 years. |
| terahour | 1012 h | About 114,155,251 years. |
| galactic year | 2.3×108 yr | The amount of time it takes the Solar System to orbit the center of the Milky Way Galaxy one time. Around 230,000,000 years. |
| gigaquarter | 109 q | About 250,000,000 years. |
| cosmological decade | varies | 10 times the length of the previous cosmological decade, with CÐ 1 beginning either 10 seconds or 10 years after the Big Bang, depending on the definition. |
| gigaannum | 109 yr | Also refers to an indefinite period of time, otherwise is 1,000,000,000 years. Also called "gigayear". |
| petaminute | 1012 m | About 1,902,587,519 years. |
| teraday | 1012 d | About 2,739,726,000 years. |
| teraweek | 1012 w | About 19,178,082,000 years. |
| exasecond | 1018 s | About 31,709,791,983 years. |
| terafortnight | 1012 fn | About 38,356,164,000 years. |
| teramonth | 1012 m | About 83,333,333,000 years. |
| petahour | 1015 h | About 114,155,251,000 years. |
| teraquarter | 1012 q | About 250,000,000,000 years. |
| teraannum | 1012 yr | About 1,000,000,000,000 years. Also called "terayear". |
| examinute | 1018 m | About 1,902,587,519,000 years. |
| petaday | 1015 d | About 2,739,726,000,000 years. |
| petaweek | 1015 w | About 1.917808E+13 years. |
| zettasecond | 1021 s | About 31,709,791,983,764 years. |
| petafortnight | 1015 fn | About 3.835616E+13 years. |
| petamonth | 1015 m | About 8.333333E+13 years. |
| exahour | 1018 h | About 114,155,251,000,000 years. |
| petaquarter | 1015 q | About 2.5E+14 years. |
| petaannum | 1015 yr | About 1,000,000,000,000,000 years. Also called "petayear". |
| zettaminute | 1021 m | About 1.902587E+15 years. |
| exaday | 1018 d | About 2.739726E+15 years. |
| exaweek | 1018 w | About 1.917808E+16 years. |
| yottasecond | 1024 s | About 31,709,791,983,764,584 years. |
| exafortnight | 1018 fn | About 3.835616E+16 years. |
| examonth | 1018 m | About 8.333333E+16 years. |
| zettahour | 1021 h | About 1.141552E+17 years. |
| exaquarter | 1018 q | About 2.5E+17 years. |
| exaannum | 1018 yr | About 1,000,000,000,000,000,000 years. Also called "exayear". |
| yottaminute | 1024 m | About 1.902587E+18 years. |
| zettaday | 1021 d | About 2.739726E+18 years. |
| zettaweek | 1021 w | About 1.917808E+19 years. |
| xennasecond | 1027 s | About 3.1709791983765E+19 years. |
| zettafortnight | 1021 fn | About 3.835616E+19 years. |
| zettamonth | 1021 m | About 8.333333E+19 years. |
| yottahour | 1024 h | About 1.141552E+20 years. |
| zettaquarter | 1021 q | About 2.5E+20 years. |
| zettaannum | 1021 yr | About 1E+21 years. Also called "zettayear". |
| xennaminute | 1027 m | About 1.902587E+21 years. |
| yottaday | 1024 d | About 2.739726E+21 years. |
| yottaweek | 1024 w | About 1.917808E+22 years. |
| dakasecond | 1030 s | About 3.1709791983765E+22 years. |
| yottafortnight | 1024 fn | About 3.835616E+22 years. |
| yottamonth | 1024 m | About 8.333333E+22 years. |
| xennahour | 1027 h | About 1.141552E+23 years. |
| yottaquarter | 1024 q | About 2.5E+23 years. |
| yottaannum | 1024 yr | About 1E+24 years. Also called "yottayear". |
| dakaminute | 1030 m | About 1.902587E+24 years. |
| xennaday | 1027 d | About 2.739726E+24 years. |
| xennaweek | 1027 w | About 1.917808E+25 years. |
| hendasecond | 1033 s | About 3.1709791983765E+25 years. |
| xennafortnight | 1027 fn | About 3.835616E+25 years. |
| xennamonth | 1027 m | About 8.333333E+25 years. |
| dakahour | 1030 h | About 1.141552E+26 years. |
| xennaquarter | 1027 q | About 2.5E+26 years. |
| xennaannum | 1027 yr | About 1E+27 years. Also called "xennayear". |
| hendaminute | 1033 m | About 1.902587E+27 years. |
| dakaday | 1030 d | About 2.739726E+27 years. |
| dakaweek | 1030 w | About 1.917808E+28 years. |
| dokasecond | 1036 s | About 3.1709791983765E+28 years. |
| dakafortnight | 1030 fn | About 3.835616E+28 years. |
| dakamonth | 1030 m | About 8.333333E+28 years. |
| hendahour | 1033 h | About 1.141552E+29 years. |
| dakaquarter | 1030 q | About 2.5E+29 years. |
| dakaannum | 1030 yr | About 1E+30 years. Also called "dakayear". |
| dokaminute | 1036 m | About 1.902587E+30 years. |
| hendaday | 1033 d | About 2.739726E+30 years. |
| hendaweek | 1033 w | About 1.917808E+31 years. |
| tradakasecond | 1039 s | About 3.1709791983765E+31 years. |
| hendafortnight | 1033 fn | About 3.835616E+31 years. |
| hendamonth | 1033 m | About 8.333333E+31 years. |
| dokahour | 1036 h | About 1.141552E+32 years. |
| hendaquarter | 1033 q | About 2.5E+32 years. |
| hendaannum | 1033 yr | About 1E+33 years. Also called "hendayear". |
| tradakaminute | 1039 m | About 1.902587E+33 years. |
| dokaday | 1036 d | About 2.739726E+33 years. |
| dokaweek | 1036 w | About 1.917808E+34 years. |
| tedakasecond | 1042 s | About 3.1709791983765E+34 years. |
| dokafortnight | 1036 fn | About 3.835616E+34 years. |
| dokamonth | 1036 m | About 8.333333E+34 years. |
| tradakahour | 1039 h | About 1.141552E+35 years. |
| dokaquarter | 1036 q | About 2.5E+35 years. |
| dokaannum | 1036 yr | About 1E+36 years. Also called "dokayear". |
| tedakaminute | 1042 m | About 1.902587E+36 years. |
| tradakaday | 1039 d | About 2.739726E+36 years. |
| tradakaweek | 1039 w | About 1.917808E+37 years. |
| pedakasecond | 1045 s | About 3.1709791983765E+37 years. |
| tradakafortnight | 1039 fn | About 3.835616E+37 years. |
| tradakamonth | 1039 m | About 8.333333E+37 years. |
| tedakahour | 1042 h | About 1.141552E+38 years. |
| tradakaquarter | 1039 q | About 2.5E+38 years. |
| tradakaannum | 1039 yr | About 1E+39 years. Also called "tradakayear". |
| pedakaminute | 1045 m | About 1.902587E+39 years. |
| tedakaday | 1042 d | About 2.739726E+39 years. |
| tedakaweek | 1042 w | About 1.917808E+40 years. |
| exdakasecond | 1048 s | About 3.1709791983765E+40 years. |
| tedakafortnight | 1042 fn | About 3.835616E+40 years. |
| tedakamonth | 1042 m | About 8.333333E+40 years. |
| pedakahour | 1045 h | About 1.141552E+41 years. |
| tedakaquarter | 1042 q | About 2.5E+41 years. |
| tedakaannum | 1042 yr | About 1E+42 years. Also called "tedakayear". |
| exdakaminute | 1048 m | About 1.902587E+42 years. |
| pedakaday | 1045 d | About 2.739726E+42 years. |
| pedakaweek | 1045 w | About 1.917808E+43 years. |
| zedakasecond | 1051 s | About 3.1709791983765E+43 years. |
| pedakafortnight | 1045 fn | About 3.835616E+43 years. |
| pedakamonth | 1045 m | About 8.333333E+43 years. |
| exdakahour | 1048 h | About 1.141552E+44 years. |
| pedakaquarter | 1045 q | About 2.5E+44 years. |
| pedakaannum | 1045 yr | About 1E+45 years. Also called "pedakayear". |
| zedakaminute | 1051 m | About 1.902587E+45 years. |
| exdakaday | 1048 d | About 2.739726E+45 years. |
| exdakaweek | 1048 w | About 1.917808E+46 years. |
| yodakasecond | 1054 s | About 3.1709791983765E+46 years. |
| exdakafortnight | 1048 fn | About 3.835616E+46 years. |
| exdakamonth | 1048 m | About 8.333333E+46 years. |
| zedakahour | 1051 h | About 1.141552E+47 years. |
| exdakaquarter | 1048 q | About 2.5E+47 years. |
| exdakaannum | 1048 yr | About 1E+48 years. Also called "exdakayear". |
| yodakaminute | 1054 m | About 1.902587E+48 years. |
| zedakaday | 1051 d | About 2.739726E+48 years. |
| zedakaweek | 1051 w | About 1.917808E+49 years. |
| nedakasecond | 1057 s | About 3.1709791983765E+49 years. |
| zedakafortnight | 1051 fn | About 3.835616E+49 years. |
| zedakamonth | 1051 m | About 8.333333E+49 years. |
| yodakahour | 1054 h | About 1.141552E+50 years. |
| zedakaquarter | 1051 q | About 2.5E+50 years. |
| zedakaannum | 1051 yr | About 1E+51 years. Also called "zedakayear". |
| nedakaminute | 1057 m | About 1.902587E+51 years. |
| yodakaday | 1054 d | About 2.739726E+51 years. |
| yodakaweek | 1054 w | About 1.917808E+52 years. |
| ikasecond | 1060 s | About 3.1709791983765E+52 years. |
| yodakafortnight | 1054 fn | About 3.835616E+52 years. |
| yodakamonth | 1054 m | About 8.333333E+52 years. |
| nedakahour | 1057 h | About 1.141552E+53 years. |
| yodakaquarter | 1054 q | About 2.5E+53 years. |
| yodakaannum | 1054 yr | About 1E+54 years. Also called "yodakayear". |
| ikaminute | 1060 m | About 1.902587E+54 years. |
| nedakaday | 1057 d | About 2.739726E+54 years. |
| nedakaweek | 1057 w | About 1.917808E+55 years. |
| nedakafortnight | 1057 fn | About 3.835616E+55 years. |
| nedakamonth | 1057 m | About 8.333333E+55 years. |
| ikahour | 1060 h | About 1.141552E+56 years. |
| nedakaquarter | 1057 q | About 2.5E+56 years. |
| nedakaannum | 1057 yr | About 1E+57 years. Also called "nedakayear". |
| ikaday | 1060 d | About 2.739726E+57 years. |
| ikaweek | 1060 w | About 1.917808E+58 years. |
| ikafortnight | 1060 fn | About 3.835616E+58 years. |
| ikamonth | 1060 m | About 8.333333E+58 years. |
| ikaquarter | 1060 q | About 2.5E+59 years. |
| ikaannum | 1060 yr | About 1E+60 years. Also called "ikayear". The biggest unit of time. |
References
- "Meet the zeptosecond, the shortest unit of time ever measured". Retrieved 2020-10-17.
- Milham, Willis I. (1945). Time and Timekeepers. New York: MacMillan. p. 190. ISBN 0-7808-0008-7.
- "Semester". Webster's Dictionary. Retrieved 3 December 2014.
- McCarthy, Dennis D.; Seidelmann, P. Kenneth (2009). Time: from Earth rotation to atomic physics. Wiley-VCH. p. 18. ISBN 978-3-527-40780-4., Extract of page 18
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