Mie Theory Calculator (Extinction per particle vs Wavelength)

Nanoparticle Conversion Calculator

Outputs: mass concentration, atomic molarity, particle concentration and mass %

Molecular Weight to Size Calculator

How big is a protein molecule?

Protein M (kDa) 5 10 20 50 100 200 500
Rmin (nm) 1.1 1.42 1.78 2.4 3.05 3.84 5.21

For more information, see Erickson, Biological Procedure Online vol. 11, no. 1.