Picomoles/Microliter to Micrograms/Milliliter
How long is your oligo (in nucleotides)?
What is the concentration (in pmol/l)?

You have g/ml DNA

pmol DNA x 1000l x 330pg x ug  x N =  ug  DNA

l ml pmol 106pg ml

N is the number of nucleotides and
330pg/pmol is the average molecular weight of a nucleotide.

Based on BioMath programs created and copyrighted by Promega Corporation.