Names for Periods of Time
Milliseconds to seconds and more...  
Time measurements
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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)

Detail pages
" Feet to metres calculator
" Metres to feet calculator
"
British Thermal Units Btu
" Density of bulk materials
" Density of liquids
" Specific Gravity of water
" Density of metals
" Density of woods
" Kitchen metric
" Medical metric
" Parts per million - ppm
" Clothing metric
" Yarn metric
" Time
" cc to hp
" Paper & Envelopes
" Gross to Nett price
" Nett to Gross price
" Add on Commission
" Sheet metal swg - mm
" Wire & rod swg - awg
" Electrical wire swg - awg
" Steam tables (4 pages)
" Watts, amps, volts, ohms
" M Threads & spanners
" Self tapping screws
" M tap & pilot drill sizes
Other useful sections

 

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We have tried to be accurate with the above table but cannot be held responsible for inaccuracies.
Go back to first principals and double check your calculations if the result is 'mission critical'.

Remember that you cannot create energy only convert it. Likewise, you will not find a conversion from pounds to metres - the basic units must remain the same - mass converted to mass, length converted to length, et al.

You won't usually find a conversion from kilograms to grams - the prefix 'kilo' means '1,000' so a kilogram is in fact 1,000 grams in the same way as a kilometer is 1,000 metres [or about 1,000 yards in 'old money']. I have put a few in the tables because visitors have asked for them. More prefixes can be found on another table.

One handy metric link between units to remember is that 1 Litre [1000cc] of pure water weighs 1 kilogram.

If accuracy is critical beware of old versions of MS Excel which had problems rounding off numbers.

More information on the SI System (Le Système International d'Unités) base units and definitions.


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last modified: 8th.September 2011


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