For your convenience, please use our Oligo Analysis Tool or apply the formula below:

MW [g/mol]= 249.23 x n_A + 240.21 x n_T + 265.23 x n_G + 225.20 x n_C + 63.98 x (s-1) + 2.02

n = number of nucleosides of the type X
s = number of all nucleosides per sequence


Example:
Sequence: GAA ATG AGT GCT CAT CAC TAC TTC CGC (27mer)

n_A=7; n_C=8; n_G=5; n_T=7

MW [g/mol]= 249.23 x 7 + 240.21 x 7 + 265.23 x 5 + 225.20 x 8+ 63.98 x (s-1) + 2.02 = 8219.33