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Bench Calculators
Day to day bench maths: length to mass, amount conversions, OD260 readings and dilution planning.
Length → mass and amounts
Average molar mass from the length, then convert a quantity into every unit you may need.
Molar mass650 kDa (650,000 g/mol)
mol1.538e-12
mmol1.538e-9
µmol1.538e-6
nmol0.0015
pmol1.5385
g1.000e-6
mg0.001
µg1
ng1000
OD260 → concentration
Beer-Lambert with the extinction coefficient of your oligo or protein.
Corrected A2601.000
Concentrationset ε to compute
Mass concentrationset molar mass
Dilution
Fill any three fields, leave the one you want solved empty.
Stock volume (V1)5.000
How it is computed
So you can check the numbers yourself.
- dsDNA ≈ 650 g/mol per bp, ssDNA ≈ 330, RNA ≈ 340, protein ≈ 110 per residue.
- c (M) = A260 × dilution ÷ ε, with a 1 cm path length.
- Dilution uses C1 × V1 = C2 × V2 with the same units on both sides.
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