Lab Calculators
Molarity, dilutions, reconstitution and molecular weight.
Everything is calculated in your browser. Double-check anything critical before you pipette.
Molarity calculator
Mass = concentration × volume × molecular weight. Pick what to work out and fill in the rest.
Dilution calculator (C1V1 = C2V2)
Fill in three values and leave the one you want blank.
Reconstitution calculator
How much solvent to add to a vial of powder to get the concentration you want.
Percent solution calculator
How much to weigh out (w/v) or measure (v/v) for a percentage solution.
Molecular weight calculator
Type a formula. Brackets and hydrates work, like Ca(OH)2 or CuSO4·5H2O (use · or a full stop).
| Element | Atoms | Mass | % by mass |
|---|
Worked examples
How do I make 100 mL of 1 M NaCl?
NaCl is 58.44 g/mol. Mass = 1 mol/L × 0.1 L × 58.44 g/mol = 5.844 g. Dissolve it in less than 100 mL of water, then top up to 100 mL.
How do I dilute a 10 mM stock to 50 µM in 2 mL?
V1 = C2 × V2 ÷ C1 = 50 µM × 2 mL ÷ 10,000 µM = 10 µL of stock, plus 1,990 µL of diluent.
What does 1X mean?
Buffers are often sold as concentrates like 10X. To make 1X, dilute one part stock in ten parts total: 50 mL of 10X in 500 mL final volume. Pick X as the unit in the dilution calculator.
