What it does
Promega Biomath provides calculators for DNA quantities, molar relationships, ligation ratios, dilution and related laboratory arithmetic.
Promega Biomath separates double- and single-stranded DNA conversions, linear DNA ends, insert:vector molar ratios, protein conversions and dilution-related calculations. For the displayed dsDNA µg-to-pmol calculation, enter DNA length in bp and DNA amount in µg. The displayed formula multiplies the mass by 10⁶ and divides by 660 and the length; its explanation identifies 660 pg/pmol as the average molecular weight of a nucleotide pair. This length-dependent approximation should be recorded with the result rather than applied to every molecule type. The page requires a decimal point, not a decimal comma, for calculation input and output.
Strengths
- DNA and molar-ratio calculation tools
- Formula displayed with the selected calculator
Watch out for
- Decimal input uses a point rather than a comma
Best for
- Checking molecular-biology quantities and units
Sources
- Biomath Calculators | DNA Calculator | Vector Insert Ratio (Oct 26, 2026)