Chemistry Calculators

Chemistry calculators online make stoichiometric, molecular, and solution-based calculations fast and reliable for students, educators, and laboratory professionals. These interactive tools simplify formula mass, moles-to-grams conversions, percent composition, and empirical formula derivations, reducing calculation errors and improving accuracy in chemical analysis.

Use advanced chemistry calculator tools to compute dilutions, theoretical yields, reaction ratios, and gas volumes at standard conditions. Each chemistry computation module is designed to streamline lab preparation, quantitative analysis, and experimental planning — helping you master the fundamentals of chemical stoichiometry, equilibrium, and concentration.

⚠ Disclaimer: This calculator provides results based on standard formulas and simplified assumptions. It is intended for educational purposes only and should not be used for professional, medical, industrial, or experimental applications without expert verification.

Molecular Weight / Formula Mass

Sum of atomic masses (g/mol)

Moles from grams

Mass (g) Molar mass (g/mol)

Grams from moles

Moles Molar mass (g/mol)

Avogadro’s Number Conversion

Number of particles Moles

1 mol = 6.022e23 particles

Percent Composition

Mass of element (g) Total compound mass (g)

Empirical Formula from % Composition

Mass of element 1 (g) Molar mass element 1 (g/mol) Mass of element 2 (g) Molar mass element 2 (g/mol)

Molecular Formula

Empirical formula mass (g/mol) Molar mass of compound (g/mol)

Mass Fraction of Element

Mass of element (g) Total mass of compound (g)

Mass Ratio

Mass 1 (g) Mass 2 (g)

Stoichiometric Mole Ratio

Moles of reactant A Moles of reactant B

Limiting Reagent

Moles of reactant A Moles of reactant B

Excess Reagent

Moles of limiting reagent Moles of excess reagent

Percent Yield

Actual yield (g) Theoretical yield (g)

Theoretical Yield

Moles of limiting reagent Molar mass product (g/mol)

Dilution (C1V1=C2V2)

Initial concentration (C1) Final concentration (C2) Final volume (V2, L)

V1 = C2*V2 / C1

Solution Preparation

Desired concentration (mol/L) Volume (L) Molar mass (g/mol)

Mass = Molarity × Volume × Molar Mass

Mass-Volume Conversion

Mass (g) Density (g/mL)

Concentration Units Converter

Value From unit (M, mM, μM, ppm) To unit (M, mM, μM, ppm)

Density → Mass/Volume

Density (g/mL) Volume (mL)

Volume of Gas at STP

Moles of gas

Volume = moles × 22.4 L (STP)