| µg DNA 
                              x | pmol | x | 106pg | x | 1 | x 2 x | kb | = pmol DNA | 
                          
                            | 
 | 
 | 
 | 
 | 
                          
                            | 660pg | 1µg | N | 1000bp | 
                        N is the 
                        number of nucleotides (in kb),
660pg/pmol is the 
                        average molecular weight
of a single nucleotide pair, 
                        
2 is the number of ends in a linear DNA 
                        molecule,
and kb/1000bp is a conversion factor from 
                        kilobases to base pairs.
Based on BioMath programs created and 
                        copyrighted by Promega Corporation.