WebToolArcChemistry Tools
Free browser-based chemistry tools with instant results and no account required.
Interactive Periodic Table
Explore all 118 chemical elements by atomic number, symbol, group, period, category, and atomic weight.
Chemistry ToolsMolecular Weight Calculator
Calculate molecular weight or molar mass from a chemical formula.
Chemistry ToolsMolarity Calculator
Calculate molarity from moles or solute mass and solution volume.
Chemistry ToolsDilution Calculator
Solve dilution problems using C1V1 = C2V2.
Chemistry ToolsMoles to Grams Calculator
Convert moles of a compound to grams using its chemical formula.
Chemistry ToolsGrams to Moles Calculator
Convert grams of a compound to moles using its chemical formula.
Chemistry ToolsPercent Composition Calculator
Calculate mass percent composition of each element in a chemical formula.
Chemistry ToolspH Calculator
Calculate pH or pOH directly from hydrogen or hydroxide ion concentration.
Chemistry ToolsHalf-Life Calculator
Calculate exponential decay from half-life, elapsed time, and initial amount.
Chemistry ToolsIdeal Gas Law Calculator
Solve pressure, volume, moles, or temperature with PV = nRT.
Chemistry ToolsPercent Yield Calculator
Calculate percent yield, actual yield, or theoretical yield from the other two values.
Chemistry ToolsLimiting Reagent Calculator
Identify the limiting reactant from stoichiometric coefficients and available amounts.
Chemistry ToolsEmpirical Formula Calculator
Find an empirical formula from element masses or percent composition.
Chemistry ToolsMolecular Formula Calculator
Find a molecular formula from an empirical formula and measured molar mass.
Chemistry ToolsMolality Calculator
Calculate molality from solute moles and solvent mass.
Chemistry ToolsMole Fraction Calculator
Calculate mole fractions and mole percentages for a multicomponent mixture.
Chemistry ToolsPercent Solution Calculator
Calculate percent concentration on w/w, w/v, or v/v bases.
Chemistry ToolsPPM Concentration Calculator
Calculate mass-based parts per million and dilute-aqueous mg/L estimates.
Chemistry ToolsNormality Calculator
Calculate normality from molarity and a user-supplied reaction equivalence factor.
Chemistry ToolsBuffer pH Calculator
Estimate buffer pH with the Henderson–Hasselbalch relationship.