This is a placeholder page for a comparison of various scales of finite
numbers, including counts of things and
dimensionless numbers.
- 1024[?]
- there are roughly 6.022×1023 atoms in a gram of hydrogen
- 1021[?]
- 1018[?]
- it has been estimated that all the world's beaches put together hold roughly 2 × 1015 grains of sand
- 1015[?]
- 1012[?]
- approximately 4×1011 stars in the Milky Way galaxy
- between 1 × 1010 and 8 × 1010 galaxies in the observable (as of 2003) Universe
- approximately 6×109 human beings living in 2003
- approximately 3×109 web pages indexed by Google in 2003
- approximately 3×109 base pairs in the human genome
- 109[?]
- Cataloged stars: The Guide Star Catalog II[?] has entries on 998,402,801 distinct astronomical objects
- Books: The British Library claims that it holds over 150 million items. The Library of Congress claims that it holds approximately 119 million items.
- Geographic places: The NIMA GEOnet Names Server[?] contains approximately 3.88 million named geographical features outside the United States, with 5.34 million names. The USGS Geographic Names Information System[?] claims to have almost 2 million physical and cultural geographic features within the United States.
- Species: The World Resources Institute[?] claims that approximately 1.4 million species have been named, out of an unknown number of total species (estimates range between 2 and 100 million species).
- 106[?]
- 105
- Each human being is estimated to have 30,000 to 40,000 genes
- There are 20,000 - 40,000 Chinese characters, depending on how you count them
- 104[?]
- 103[?]
- there were 191 Member States of the United Nations as of 2003
- there are 26 letters in the Latin alphabet
- 102[?]
- 101[?]
- there are 10 fingers on a pair of human hands
- 7 ± 2, in cognitive science, George A. Miller[?]'s estimate of the number of objects that can be simultaneously thought of by the human mind
- π, the ratio of a circle's diameter to its circumference
- e, the base of the natural logarithms
- φ, the golden mean
- one
- 10-1[?]
- 10-2[?]
- 10-3[?]
- 10-6[?]
- 10-9[?]
- 10-12[?]
- 10-15[?]
- 10-18[?]
- 10-21[?]
- 10-24[?]
See also: