Milliseconds to seconds and more... Time measurements
Time is one of the few Imperial or Standard measures still used in the Metric System.
There are proposals for metric time where a day is divided into 10 hours; an hour into 100 minutes; etc. but that is not in general use.
The shorter intervals like nanoseconds and femtoseconds are used in computers and laser technology while light years and astronomical units are used in space research.
There are 1,000 milliseconds in 1 second; 1,000 microseconds in 1 millisecond; and so on.
NOTE:- A millisecond is one thousandth of a second, NOT one millionth.
 fractions of a second metric name 0,000 000 000 000 000 000 000 001 yoctosecond [ ys ] 0,000 000 000 000 000 000 001 zeptosecond [ zs ] 0,000 000 000 000 000 001 attosecond [ as ] 0,000 000 000 000 001 femtosecond [ fs ] 0,000 000 000 001 [ trillionth ] picosecond [ ps ] 0,000 000 001 [ billionth ] nanosecond [ ns ] 0,000 001 [ millionth ] microsecond [ µs ] 0,001 [ thousandth ] millisecond [ ms ] 0.01 [ hundredth ] centisecond [ cs ] 1.0 second [ s ] seconds to years 60 seconds = 1 minute [ mean solar ] 59.83617 seconds = 1 minute [ sidereal ] 60 minutes = 1 hour 24 hours = 1 day 3,600 seconds = 1 hour 86,400 seconds = 1 day [ mean solar ] 86,164.09 seconds = 1 day [ sidereal ] 7 days = 1 week 168 hours = 1 week 14 days = 1 fortnight 28, 29, 30 or 31 days = 1 month 365 days = 1 year 366 days = 1 leap year 12 months = 1 year 31,536,000 seconds = 1 year [ calendar ] 31,558,150 seconds = 1 year [ sidereal ] 31,556,930 seconds = 1 year [ tropical ] 9,460,550,000,000,000 metres = 1 light year 299,792,458 metres per second ( m/s ) = speed of light parsec = approx. 3.25 light years year intervals - anniversaries number of years Biennial 2 Triennial 3 Quadrennial 4 Quinquennial 5 Hexennial * 6 Septennial 7 Octennial 8 Novennial 9 Decennial 10 Hendecennial * 11 Duodecennial 12 Tredecennial * 13 Quindecennial 15 Sextodecennial * 16 Septendecennial 17 Vigintennial * 20 Trigentennial * 30 Quadragennial 40 Quinquagenary 50 Sexagennial * 60 Septuagennial * 70 Septuagesiquintennial * 75 Octogintennial * 80 Nonagintennial * 90 Centennial 100 Quasquicentennial 125 Sesquicentennial 150 Terquasquicentennial or Septaquintaquinquecentennial * 175 Bicentennial 200 Quasquibicentennial * 225 Semiquincentennial * 250 Tercentennial 300 Semiseptcentennial * 350 Quatercentenary 400 Quincentennial 500 Sexcentennial * 600 Septcentennial * 700 Octocentennial 800 Millenial 1,000 Quindecimillenial 15,000 Note:- Interval names marked with a * do not appear in major dictionaries but follow a logical linguistic progression. Thanks to Glenn Kersten for the bulk of the data on anniversaries.
Related pages
 " Home page " Info on SI Units " SI Unit Descriptions " SI Derived Units " SI Prefixes (mega, giga) " Imperial/UK Units " Scientific Notation --(i.e. what is 1.00E+09)
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