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Chemistry Calculators

Molarity, pH, dilution, stoichiometry, gas laws, and related chemistry calculations.

10 free tools available

Calculate density from mass and volume

Calculate gas properties using gas laws

Calculate remaining amount, time, or half-life for exponential decay

Calculate molality of solutions

Calculate molarity of solutions

Calculate pH from concentration

Calculate chemical reaction stoichiometry

How to choose the right chemistry calculators

Work through molarity, pH, dilution, stoichiometry, gas laws, and related solution chemistry with explicit formulas and units.

Before you use a tool

  • Confirm concentration units (M, mol/L, molality) before entering values.
  • Dilution assumes additive volumes unless noted otherwise.
  • Lab measurements still need instrument calibration and safety review.

A practical workflow

Identify the known quantities, choose the matching chemistry calculator, enter values with consistent units, and sanity-check the result against textbook expectations.