Molarity Calculator
mass (g) = concentration (mol/L) × volume (L) × molecular weight (g/mol). Fill in any three fields, leave one blank.
Worked example
To make 10 mL of a 2 mM solution of a compound with MW 500 g/mol: 0.002 mol/L × 0.010 L × 500 g/mol = 0.010 g = 10 mg.
Concentration unit cheat sheet
- 1 M = 1,000 mM = 1,000,000 µM
- mM = (mg/mL) ÷ MW × 1,000
- µM = (µg/mL) ÷ MW × 1,000
Need the MW of a peptide? Use the peptide molecular weight calculator. Diluting a stock? Use the dilution calculator (C1V1 = C2V2).
FAQ
What is the molarity formula?
Molarity (M, mol/L) = moles of solute ÷ liters of solution, and moles = mass (g) ÷ molecular weight (g/mol). So mass (g) = M × volume (L) × MW.
How do I convert mg/mL to µM?
µM = (mg/mL) ÷ MW (g/mol) × 1,000,000. Example: 1 mg/mL of a 1,000 g/mol compound is 1,000 µM (1 mM).
How do I convert µM to mg/mL?
mg/mL = µM × MW ÷ 1,000,000.
Where do I find the molecular weight?
On the product label or certificate of analysis. For a peptide you can calculate it from the sequence with the peptide molecular weight calculator.
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