Free lab calculators
Quick, accurate chemistry calculators for the bench and the purchase desk. No sign-up, nothing stored.
Molecular Weight Calculator
Calculate molar mass from any chemical formula, including hydrates and parentheses.
Molarity Calculator
Mass needed for a target molarity and volume — or the molarity of a solution you made.
Dilution Calculator (C1V1 = C2V2)
Work out stock volume needed to prepare a diluted solution.
CAS Number Validator
Check whether a CAS Registry Number is valid using its check digit.
Lab Unit Converter
Convert mass, volume, concentration (ppm, %, mg/L) and temperature units.