Millennium conversions

time conversions » millennium conversions
Time Conversions: millennium conversions - convert millennia to:
Convert millennia to

The online converter calculator on this page allows you to select the time measurement unit you want to convert to starting from millennia. To make a conversion starting from a unit of time other than millennium, simply click on the "Reset" button.

What is millennium?


The millennium is a unit of time equal to 1,000 years. A millennium is used for specific periods of one thousand years that begin at initial reference point of the calendar in consideration; however, a millennium may also refer to any period of 1,000 years long.

One lustrum corresponds to 0.005 millennia.
One decade corresponds to 0.001 millennia.
One century corresponds to 0.1 millennia.

In the Gregorian Calendar (that has no year zero), the millennia is counted from 1 AD:

  • First millennium: year 1AD - year 1000
  • Second millennium: year 1001 - year 2000
  • Third millennium: year 2001 - year 3000

In the astronomical numbering system (that assumes a preceding Year 0 for the start of the first Christian millennium):

  • First millennium: year 0 - year 999
  • Second millennium: year 1000 - year 1999
  • Third millennium: year 2000 - year 2999