how big is an angstrom
(3,000,000,000 base pairs) x (3.4 angstroms per base pair) = 10,200,000,000 angstroms long. Now, 1 angstrom is equal to 0.0000000001 meter. So, the length of the human genome is about: 1.02 meters or around 40 inches. On the other hand, the diameter of DNA is around 2 nanometers (nm). That's two billionths of a meter, or 2x10-9 m.