⚗Chemistry Calculators
Free chemistry calculators for stoichiometry, thermodynamics, gas laws and more — all client-side, no signup required.
Calculate the molar mass of any chemical formula with a per-element breakdown, percent composition, and mass-to-moles conversion.
Find the empirical formula from percentage composition or mass data.
Identify which reagent runs out first in a chemical reaction.
Convert between moles, mass and particles using stoichiometry.
Balance any chemical equation using the matrix method.
Interconvert pH, pOH, [H⁺] and [OH⁻] for acids and bases.
Solve C1V1=C2V2 for any variable in a dilution problem.
Solve PV=nRT for any variable with real gas comparison.
Calculate radioactive decay with an exponential decay graph.
Calculate percent yield from actual and theoretical yield.
Convert between molarity, molality, percent mass and ppm.
Explore all 118 elements with full data, category color-coding, and search.
Get the full and shorthand electron configuration for any element.
Apply Boyle's, Charles's, Gay-Lussac's and the combined gas law.
Use the Henderson-Hasselbalch equation for buffer pH problems.
Calculate ΔH of reaction using Hess's law and formation enthalpies.
Balance redox equations by the half-reaction method in acidic or basic solution.
Convert between Ksp and molar solubility for sparingly soluble salts.
About these chemistry calculators
These chemistry tools handle the calculation-heavy parts of general and analytical chemistry. The molar mass calculator parses any chemical formula and shows the contribution of each element. The chemical equation balancer uses matrix algebra to balance even complex reactions. The stoichiometry calculator walks through mole-to-mass-to-particle conversions step by step.
Every tool runs entirely in your browser with no signup required. From first-year general chemistry to advanced analytical and physical chemistry — these calculators are ready immediately, with no installation and no data sent to a server.