Enter your Nucleic Acid Type, Sequence Length, and either a Mass Amount or Molar Amount into the DNA/RNA Molarity Calculator, then hit Calculate to get your Primary Result alongside the sample's Molecular Weight, Secondary Result, and Concentration — no manual formula-juggling required.
Primary Result
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Molecular Weight
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Secondary Result
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Concentration
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Single-strand DNA (ssDNA) uses the molecular weight of individual nucleotides (~330 g/mol per base), while double-strand DNA (dsDNA) uses the average molecular weight of nucleotide pairs (~660 g/mol per base pair). This affects the final molarity calculations significantly.
To calculate molarity, you need the mass of your DNA sample, its sequence length, and whether it's single or double-strand. The calculator uses the formula: Molarity = (mass in grams) / (molecular weight × volume in liters).
For double-strand DNA, the average molecular weight is 660 g/mol per base pair. For single-strand DNA, it's approximately 330 g/mol per nucleotide. RNA calculations use similar values but account for the different sugar backbone.
Yes, the calculator supports both DNA and RNA calculations. RNA has a slightly different molecular weight due to the ribose sugar and different base composition, which is automatically accounted for in the calculations.
The calculator accepts various units: mass (grams to picograms), molar amounts (moles to picomoles), and volumes (liters to nanoliters). All conversions are handled automatically to provide accurate results.
Sequence length determines the molecular weight of your nucleic acid. Longer sequences have higher molecular weights, which directly affects the number of moles present in a given mass and therefore the molarity of your solution.
These calculations provide theoretical values based on average molecular weights. For precise laboratory work, consider factors like salt concentration, pH, and exact base composition, which can slightly affect the actual molecular weight.
The calculator can convert between various molar units (mol, mmol, µmol, nmol, pmol) and provides results in the most appropriate unit based on your input values. Simply select your desired input and output units.