Chemistry Tools & Calculators
Free browser-based calculators for solution preparation, reaction stoichiometry, acid-base chemistry, and substance data. Everything runs locally — your data is never uploaded.
Make stock and working solutions: molarity, dilution, percent solutions and concentration conversions.
Molarity & Solution Preparation Calculator
Solve for molarity, solute mass, or solution volume from the other two values.
Open tool →Dilution Calculator
Calculate dilution using the C1V1 = C2V2 formula. Solve for any variable.
Open tool →Percent Solution Calculator
Calculate percent concentration (w/w, w/v, v/v) of a solution.
Open tool →Serial Dilution Calculator
Calculate concentration at each step of a serial dilution. Supports dilution factor and step count, with optional per-step volume.
Open tool →Concentration Converter
Convert between mg/mL and mM (molar concentration) using molar mass.
Open tool →Solubility Converter
Convert solubility units between g/L, mg/mL, mol/L, ppm and more, with mass-to-molar conversion by molecular weight.
Open tool →Balance equations, predict products, and scale reactants to product amounts.
Reaction Product Predictor
Enter reactant names to look up compounds via PubChem and predict products of common reactions (combustion, acid-base) with a balanced equation.
Open tool →Chemical Equation Balancer
Balance a chemical equation automatically. Find stoichiometric coefficients (e.g. H2 + O2 -> H2O).
Open tool →Stoichiometry Calculator
Calculate reactant and product moles and masses from a balanced chemical equation — enter coefficients and formulas, then specify one known mass.
Open tool →Empirical Formula Calculator
Determine the empirical formula of a compound from elemental mass percentages. Converts each element to moles and simplifies to the smallest whole-number ratio.
Open tool →Molecular Formula Calculator
Determine the molecular formula from an empirical formula and molar mass. Calculates the integer multiplier and the full molecular formula.
Open tool →Titration Curve Calculator
Simulate strong- and weak-acid titrations with a strong base — plot the pH curve and find the equivalence point.
Open tool →pH, pKa and Henderson–Hasselbalch buffer calculations for biological systems.
pH Calculator
Calculate pH from [H⁺], or from pKa for weak acids and buffers (Henderson-Hasselbalch).
Open tool →pKa / Henderson-Hasselbalch
Solve the Henderson-Hasselbalch equation for pH, pKa or the conjugate base/acid ratio.
Open tool →Buffer Calculator
Design a buffer solution using the Henderson-Hasselbalch equation. Compute the [A⁻]/[HA] ratio, concentrations, moles, and masses.
Open tool →Parse formulas, compute molar mass and elemental composition, browse the periodic table.
Molar Mass Calculator
Calculate the molar mass of a compound from its chemical formula (e.g. H2O, NaCl).
Open tool →Formula Parser
Parse a chemical formula and view element composition, atom counts, and mass contributions.
Open tool →SMILES to Molecular Weight
Enter a SMILES string to get the molecular formula and molar mass, with implicit hydrogen handling.
Open tool →Interactive Periodic Table
Browse all 118 elements. Click for atomic weight, electron shells, density, melting & boiling point, and electronegativity. Temperature slider & property heatmap.
Open tool →Density Calculator
Calculate density (ρ = m/V), mass, or volume from the other two values. Supports any combination of known and unknown variables.
Open tool →Everyday bench conversions: metric units, centrifuge RPM to g-force and back.
Theoretical crystal density and XRD angle conversions.
Particle size distributions and thermogravimetric mass-loss steps.
Solid-state batching and electrode coating calculations.