This programme will take a nucleic acid sequence and calculate the molecular weight and GC content. The program will ignore numbers, spaces or characters like B or Z which do not correspond to one of the 5 DNA bases. The atomic weight (in Daltons) for each atom used is H=1.00794, C=12.0107, N=14.0067, O=15.9994 and P=30.973761.

The programme assumes that each phosphate group has two hydrogen atoms bound to it, which may not be true outside the physiological pH range. The programme will also accept data in FASTA format.