TOOLLINKS LAB
Mass to Molar Concentration Converter
Convert ng/mL, µg/mL, mg/mL, or g/L to nM, µM, mM, or M using molar mass. Reverse the conversion on the same page.
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Lab calculators with formulas and worked examples
Convert concentration units, prepare solutions, plan dilutions, and check lab calculations. Inputs stay in your browser.
TOOLLINKS LAB
Solution Preparation Calculator
Find the solute mass needed for a target molarity and final solution volume, with explicit molar mass and purity correction.
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Dilution Calculator — C₁V₁ = C₂V₂
Calculate the volume of stock required for a lower target concentration, with independent concentration units and a final-volume check.
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Serial Dilution Calculator
Generate a dilution series with each step’s concentration, transfer volume, and nominal diluent volume. Copy the resulting table.
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Percent Weight/Volume Solution Calculator
Calculate grams of solute for a percent w/v solution and a final volume. Distinguish mass/volume percent from mass percent.
TOOLLINKS LAB
Hemocytometer Cell Count Calculator
Convert counts from large hemocytometer squares into cells/mL using the observed count, squares counted, and dilution factor.
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Centrifuge RCF ↔ RPM Calculator
Convert centrifuge speed between RPM and relative centrifugal force (× g) using the rotor radius in centimeters.
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Beer–Lambert Concentration Calculator
Estimate molar concentration from absorbance, molar absorption coefficient, and optical path length using A = εlc.
Work through a lab calculation
Start with mass-to-molar conversion when your concentration is expressed in ng/mL or µg/mL. Use solution preparation when weighing a solid, or stock dilution when starting from an existing solution.
Before changing units, distinguish the amount of solute, the total solution volume, and the molar mass. The printable lab unit reference includes practice problems and checks.
For additional chemistry and laboratory tools, explore Science & lab.