Mole Calculator
LiveCalculate moles from mass, particles, molarity and volume with formula-assisted molar mass lookup.
Calculator category
Chemistry Calculators
Calculate foundational chemistry relationships for amount of substance, formula mass, concentration, acid-base, reaction yield, equation balancing, kinetics, equilibrium, gas laws, vapor pressure, solubility, electrochemistry and redox using deterministic formulas and local reference data.
Last reviewed: July 22, 202630 live tools30 total tools
Search chemistry calculators
Find mole, formula, concentration, reaction, gas-law, vapor-pressure and colligative-property calculators.
30 calculators
Calculate molar mass from a chemical formula with element counts and atomic-weight contributions.
Calculate molecular weight or relative formula mass from a chemical formula.
Calculate molarity, moles or solution volume from moles and litres of solution.
Calculate molality or moles from solute amount and kilograms of solvent.
Calculate normality from equivalents, volume, molarity and equivalent factor.
Calculate final concentration or stock volume with the C1V1 = C2V2 dilution equation.
pH Calculator
LiveCalculate pH from hydrogen ion concentration or hydrogen ion concentration from pH.
pOH Calculator
LiveCalculate pOH from hydroxide ion concentration and estimate related pH at 25 C.
Estimate buffer pH from pKa, conjugate base concentration and weak acid concentration.
Calculate analyte concentration from titrant concentration, volumes and mole ratio.
Calculate target moles from known moles using balanced chemical equation coefficients.
Find the limiting reactant, excess remaining and product formed from balanced reaction amounts.
Calculate percent yield from actual yield and theoretical yield with unit-aware mass inputs.
Find an empirical formula from percent or mass composition using atomic weights and mole ratios.
Find a molecular formula from empirical formula and molecular molar mass.
Balance chemical equations with smallest whole-number coefficients and atom-count checks.
Solve pressure, volume, moles or temperature with PV = nRT and common gas units.
Estimate gas density from pressure, molar mass and temperature using the ideal gas relationship.
Calculate gas mixture partial pressures from total pressure and mole fractions.
Estimate dissolved gas concentration from Henry's Law constant and gas pressure.
Estimate solution vapor pressure from solvent mole fraction and pure-solvent vapor pressure.
Estimate boiling point elevation from molality, Kb and van't Hoff factor.
Estimate freezing point depression from molality, Kf and van't Hoff factor.
Calculate average reaction rate or rate-law rate from concentration, time, rate constant and order.
Calculate reaction half-life for zero-, first-, or second-order chemistry kinetics models.
Calculate Kc from a balanced reaction and equilibrium concentrations.
Calculate Ksp from ion concentrations or molar solubility and dissolution stoichiometry.
Calculate nonstandard electrochemical cell potential from E0, n, Q and temperature.
Redox Calculator
LiveIdentify oxidation and reduction roles from oxidation-number changes.
Moles and Formula Mass
Convert between moles, mass, particles, formula mass, empirical formulas and molecular formulas.
Mole Calculator
LiveCalculate moles from mass, particles, molarity and volume with formula-assisted molar mass lookup.
Calculate molar mass from a chemical formula with element counts and atomic-weight contributions.
Calculate molecular weight or relative formula mass from a chemical formula.
Find an empirical formula from percent or mass composition using atomic weights and mole ratios.
Find a molecular formula from empirical formula and molecular molar mass.
Solution Concentration
Calculate molarity, molality, normality and dilution relationships with clear unit handling.
Calculate molarity, moles or solution volume from moles and litres of solution.
Calculate molality or moles from solute amount and kilograms of solvent.
Calculate normality from equivalents, volume, molarity and equivalent factor.
Calculate final concentration or stock volume with the C1V1 = C2V2 dilution equation.
Acid-Base Calculations
Estimate pH, pOH, buffer pH and titration concentration for simplified educational acid-base calculations.
pH Calculator
LiveCalculate pH from hydrogen ion concentration or hydrogen ion concentration from pH.
pOH Calculator
LiveCalculate pOH from hydroxide ion concentration and estimate related pH at 25 C.
Estimate buffer pH from pKa, conjugate base concentration and weak acid concentration.
Calculate analyte concentration from titrant concentration, volumes and mole ratio.
Reaction Calculation Tools
Use balanced mole ratios, kinetics, equilibrium and redox helpers for reaction workflows.
Calculate target moles from known moles using balanced chemical equation coefficients.
Find the limiting reactant, excess remaining and product formed from balanced reaction amounts.
Calculate percent yield from actual yield and theoretical yield with unit-aware mass inputs.
Balance chemical equations with smallest whole-number coefficients and atom-count checks.
Calculate average reaction rate or rate-law rate from concentration, time, rate constant and order.
Calculate reaction half-life for zero-, first-, or second-order chemistry kinetics models.
Calculate Kc from a balanced reaction and equilibrium concentrations.
Redox Calculator
LiveIdentify oxidation and reduction roles from oxidation-number changes.
Gas Law Calculators
Calculate ideal gas states, gas density and partial pressure relationships.
Solve pressure, volume, moles or temperature with PV = nRT and common gas units.
Estimate gas density from pressure, molar mass and temperature using the ideal gas relationship.
Calculate gas mixture partial pressures from total pressure and mole fractions.
Solution Law, Solubility and Electrochemistry
Estimate Henry's Law solubility, Raoult vapor pressure, colligative shifts, Ksp and Nernst potentials.
Estimate dissolved gas concentration from Henry's Law constant and gas pressure.
Estimate solution vapor pressure from solvent mole fraction and pure-solvent vapor pressure.
Estimate boiling point elevation from molality, Kb and van't Hoff factor.
Estimate freezing point depression from molality, Kf and van't Hoff factor.
Calculate Ksp from ion concentrations or molar solubility and dissolution stoichiometry.
Calculate nonstandard electrochemical cell potential from E0, n, Q and temperature.
What Chemistry calculators cover
This Chemistry hub focuses on formula-based tools that calculate locally without external chemistry APIs. The Chemistry inventory is now closed with 30 live tools and no planned Chemistry cards.
The live tools handle mole conversions, formula mass, concentration, acid-base estimates, titration relationships, balanced-equation mole ratios, limiting reactants, percent yield, formula derivation, equation balancing, kinetics, equilibrium, gas laws, vapor pressure, solubility, Nernst potential and redox classification.
How to choose the right Chemistry tool
Use Mole, Molar Mass and Molecular Weight calculators when a problem starts with a formula, mass, particle count or amount of substance. Use Molarity, Molality, Normality and Dilution calculators when the problem is about solution concentration.
Use pH, pOH and Buffer calculators for simplified acid-base relationships. Use Titration, Stoichiometry, Limiting Reactant, Percent Yield, Equation Balancer, Reaction Rate, Half-Life, Equilibrium Constant and Redox tools for reaction workflows. Use the gas and solution-law tools for ideal gas, vapor-pressure, Ksp, Nernst and colligative-property estimates.
FAQs
What can I calculate with NexaCalc Chemistry Calculators?
You can calculate mole conversions, molar mass, molecular weight, molarity, molality, normality, dilution, pH, pOH, buffer pH, titration concentration, stoichiometry, limiting reactants, percent yield, empirical and molecular formulas, balanced equations, gas laws, partial pressures, Henry's Law, Raoult's Law, colligative temperature shifts, reaction rates, chemistry half-lives, equilibrium constants, Ksp, Nernst potentials and redox roles.
Which Chemistry calculators are available now?
There are 30 live Chemistry calculators covering mole and formula work, solution concentration, acid-base calculations, reaction calculations, gas laws, solution laws, solubility, electrochemistry and redox.
How are mole, molar mass and molecular weight related?
Moles connect mass to amount of substance through molar mass. Molecular weight has the same numeric formula-mass basis but is usually reported as a relative number, while molar mass is reported in g/mol.
How are molarity, molality and normality different?
Molarity uses moles per litre of solution, molality uses moles per kilogram of solvent, and normality uses equivalents per litre for a specific reaction context.
How does the Dilution Calculator use C1V1 = C2V2?
The Dilution Calculator keeps solute amount constant, so stock concentration times stock volume equals final concentration times final volume after unit conversion.
How do pH and pOH calculators relate to hydrogen and hydroxide ion concentration?
The pH calculator uses pH = -log10[H+], while the pOH calculator uses pOH = -log10[OH-]. At 25 C in the simplified model, pH plus pOH is estimated as 14.
What does the Buffer Calculator estimate?
The Buffer Calculator estimates pH with the Henderson-Hasselbalch equation from pKa, conjugate base concentration and weak acid concentration.
How does the Titration Calculator use acid-base stoichiometry?
It uses titrant concentration, titrant volume, analyte volume and balanced reaction coefficients to calculate the unknown analyte concentration at equivalence.
What does the Stoichiometry Calculator calculate?
It converts known moles of one substance into target moles of another substance using coefficients from a balanced chemical equation.
Are any Chemistry tools still planned?
No. The approved 30-tool Chemistry inventory is now live, so the Chemistry hub does not show a planned section.
Are Chemistry results suitable for lab work?
These calculators are useful for education and planning, but lab work requires verified formulas, purity, glassware, safety data, instructor guidance and measurement procedures.
Do Chemistry calculators replace lab measurement or safety guidance?
No. NexaCalc Chemistry calculators do not replace laboratory measurement, safety procedures, chemical compatibility checks or professional analysis.
Related categories
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