WebToolArcChemistry Tools
Move from formulas and composition to concentration, gases, yields and equilibrium-style calculations with explicit inputs and unit context.
Atoms, moles & formulas
Convert chemical amount and composition before moving into solution or reaction calculations.
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 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 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.
Solutions & concentration
Work with molarity, dilution and concentration expressions while keeping units and assumptions visible.
Molarity Calculator
Calculate molarity from moles or solute mass and solution volume.
Chemistry ToolsDilution Calculator
Solve dilution problems using C1V1 = C2V2.
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.
Acid/base & gases
Use focused relationships for pH, buffers and the ideal gas law rather than a generic solver.
Reaction & decay checks
Estimate limiting reagents, percent yield and half-life from the values you provide.
Limiting Reagent Calculator
Identify the limiting reactant from stoichiometric coefficients and available amounts.
Chemistry ToolsPercent Yield Calculator
Calculate percent yield, actual yield, or theoretical yield from the other two values.
Chemistry ToolsHalf-Life Calculator
Calculate exponential decay from half-life, elapsed time, and initial amount.