Chemistry Calculators
Find chemistry tools by topic: moles and formulas, reactions and yield, solution concentration, acids and bases, gas laws, equilibrium, and colligative properties.
Chemistry topic
Moles, Mass & Chemical Formulas
Convert between mass, moles, particles, gas volume, molecular weight, empirical formulas, and percent composition.
8 calculators
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Atoms to Moles Calculator
Convert atom count into moles with Avogadro's number and estimate equivalent mass for a selected element.
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Empirical Formula Calculator
Find the empirical formula from percent composition or elemental mass data by converting each element to moles and reducing to whole-number ratios.
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Grams to Moles Calculator
Convert between grams and moles using molar mass for chemistry calculations, stoichiometry, and solution preparation.
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Liters to Moles Calculator
Convert gas liters to moles or moles to liters using pressure, temperature, and the ideal gas law.
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Mole Calculator
Convert between grams, moles, and particles using molar mass and Avogadro's number.
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Molecular Weight Calculator
Calculate exact molecular weight of any chemical compound from its molecular formula with detailed atomic weight breakdown. Essential chemistry tool for stoichiometry.
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Moles to Atoms Calculator
Convert moles into atom count with Avogadro's number and show the matching mass for a selected element.
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Percent Composition Calculator
Calculate element-by-element mass percent from a chemical formula, including compounds that use grouped formulas with parentheses.
Chemistry topic
Reactions, Stoichiometry & Yield
Balance equations and calculate stoichiometric quantities, theoretical yield, and percent yield from entered reaction data.
5 calculators
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Chemical Equation Balancer
Balance chemical equations with whole-number coefficients and verify atom counts for every element before stoichiometry work.
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Molarity Calculator
Calculate solution molarity, prepare chemistry solutions, and perform dilution calculations with professional accuracy and interactive visualizations.
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Percent Yield Calculator
Calculate percent yield for chemical reactions with comprehensive efficiency analysis. Evaluate theoretical vs actual yield, optimize reaction conditions, and analyze synthesis performance for chemistry education and research.
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Stoichiometry Calculator
Convert reactants and products across a balanced chemical equation using mole ratios, molar masses, and completion adjustments.
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Theoretical Yield Calculator
Calculate theoretical product yield from a limiting reactant using balanced-equation stoichiometry and molar-mass conversions.
Chemistry topic
Solutions & Concentration
Work with molarity, molality, normality, mole fraction, dilution, serial dilution, ppm, and concentration conversions.
11 calculators
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Boiling Point Elevation Calculator
Solve boiling point elevation, molality, or molar mass from dilute-solution ebullioscopic data with solvent-specific constants.
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Dilution Calculator
Solve stock volume, final volume, concentration, and dilution factor for chemistry solution preparation with C1V1 = C2V2.
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Freezing Point Depression Calculator
Solve freezing point depression, molality, or molar mass from dilute-solution cryoscopic data with solvent-specific constants.
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Molality Calculator
Solve molality, solvent mass, or solute mass from the relationship between moles of solute and kilograms of solvent.
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Mole Fraction Calculator
Calculate binary-mixture mole fraction, mole percent, and partial-pressure splits from moles or masses.
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Normality Calculator
Solve normality, molarity, and grams required using n-factor, equivalent weight, and solution volume.
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Osmotic Pressure Calculator
Solve osmotic pressure, solution molarity, or molar mass from dilute-solution osmotic data using the van 't Hoff equation.
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Partial Pressure Calculator
Solve component partial pressure, total pressure, or mole fraction in ideal gas mixtures using Dalton's law.
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PPM Calculator
Convert among parts per million, solute mass, and solution volume for dilute aqueous mixtures.
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PPM to Molarity Calculator
Convert between ppm and molarity using molar mass for dilute aqueous solutions.
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Serial Dilution Calculator
Create a step-by-step serial dilution plan from stock concentration to target concentration using practical per-step factors.
Chemistry topic
Acids, Bases & Equilibrium
Calculate entered pH, buffers, pKa, titration, Henderson–Hasselbalch, and chemical-equilibrium relationships.
6 calculators
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Buffer pH Calculator
Estimate buffer pH from weak-acid and conjugate-base stock solutions using the Henderson-Hasselbalch relationship.
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Chemical Equilibrium Calculator
Calculate equilibrium constants, reaction quotients, and predict equilibrium shifts using Le Châtelier's principle
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Henderson-Hasselbalch Calculator
Solve pH, pKa, or conjugate base-to-acid ratio for weak-acid buffers with the Henderson-Hasselbalch equation.
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pH Calculator
Calculate pH, pOH, and hydrogen ion concentration with professional accuracy for chemistry calculations
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pKa Calculator
Convert between pKa and Ka and estimate weak-acid ionization behavior at a chosen pH.
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Titration Calculator
Solve endpoint titration concentration or volume with explicit stoichiometric ratios for chemistry coursework and laboratory planning.
Chemistry topic
Gas Laws
Apply ideal, combined, Boyle's, Charles's, partial-pressure, density, and STP relationships with consistent units.
6 calculators
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Boyle's Law Calculator
Solve gas pressure-volume changes at constant temperature using Boyle's law.
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Charles's Law Calculator
Solve gas volume-temperature changes at constant pressure using Charles's law.
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Combined Gas Law Calculator
Solve final gas pressure, volume, or temperature across two gas states with the combined gas law.
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Gas Density Calculator
Solve ideal-gas density or infer molar mass from gas density, pressure, and temperature.
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Ideal Gas Law Calculator
Solve pressure, volume, moles, or temperature with the ideal gas law using chemistry-ready unit conversions and scenario analysis.
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STP Calculator
Convert gas volume, moles, and mass at classic or IUPAC standard temperature and pressure with explicit molar-volume assumptions.
About These Chemistry Calculators
Chemistry calculations depend on balanced equations, defined substances, consistent units, significant figures, temperature and pressure conditions, and the assumptions of the selected model. Grouping the tools by topic makes it easier to choose the relationship that matches the problem being solved.
These calculators support study and transparent laboratory arithmetic. They do not identify unknown substances, assess reaction hazards, select reagents, establish experimental conditions, or replace a validated procedure, safety data sheet, instructor, or qualified laboratory professional.