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Chemistry Calculators

Molarity, dilution, pH, and chemical calculations. — 115 calculators available.

Activation Energy Calculator
Computes activation energy from two rate constants at two temperatures using the Arrhenius equation.
Activity Coefficient Calculator
Computes activity coefficient γ from activity a and concentration (or molality) using a = γ·(c/c°).
Actual Yield Calculator
Free online Actual Yield Calculator. Quickly calculate and get instant results.
Air Fuel Ratio Afr Calculator
Calculates air-fuel ratio (AFR) as mass of air divided by mass of fuel.
Alligation Calculator
Uses alligation to find mixing ratio (parts) of two strengths to reach a target concentration.
Arrhenius Equation
Computes rate constant k from Arrhenius equation: k = A·exp(-Ea/(R·T)) with R = 8.314462618 J/mol·K.
Atom Calculator
Converts sample mass to moles and number of atoms/particles using N = (m/M)·NA (NA = 6.02214076×10^23).
Atom Economy Calculator
Compute atom economy (%) from desired product molar mass and total reactant molar mass.
Atomic Mass Calculator
Estimate isotope atomic mass from proton and neutron counts (mass number approximation).
Average Atomic Mass Calculator
Compute average atomic mass from two isotopes using their masses and percent abundances.
Avogadro's Number Calculator
Calculate the number of particles from moles.
Beer Lambert Law
Calculate absorbance and transmittance using Beer–Lambert law (A = εlc).
Bleach Dilution Calculator
Free online Bleach Dilution Calculator. Quickly calculate and get instant results.
Boiling Point Altitude Calculator
Estimate water’s boiling point at a given altitude using a common linear approximation.
Boiling Point Calculator
Estimate boiling point vs pressure using Clausius–Clapeyron with ΔHvap and normal boiling point.
Boiling Point Elevation Calculator
Compute boiling point elevation and solution boiling point using ΔTb = i·Kb·m.
Bond Order Calculator
Calculate bond order from MO electron counts: (bonding − antibonding)/2.
Boyle's Law Calculator
Calculate using Boyle's Law (P1V1 = P2V2).
Buffer Capacity Calculator
Compute buffer capacity: β = |Δn| / (V·|ΔpH|) from an addition experiment.
Buffer PH Calculator
Free online Buffer PH Calculator. Quickly calculate and get instant results.
Calibration Curve Calculator
Solve a linear calibration curve y = m·x + b for unknown concentration from measured signal.
Carbon Dating Calculator
Estimate sample age from remaining Carbon-14 fraction using radioactive half-life decay.
Charles's Law Calculator
Calculate using Charles's Law (V1/T1 = V2/T2).
Chemical Equation Balancer Calculator
Chemical equation balancing requires symbolic parsing/linear algebra; not representable as a single numeric formula here
Chemical Name Calculator
Chemical naming (formula → name) requires a nomenclature rules engine and/or database, not a numeric expression.
Chemical Oxygen Demand Calculator
Compute COD (mg/L as O2) from titration: COD = (B−A)·N·8000 / V.
Combustion Analysis Calculator
From CO2 and H2O masses, compute moles of C and H and the H:C ratio for combustion analysis.
Combustion Reaction Calculator
Computes CO₂, H₂O, and O₂ coefficients for complete combustion of CxHyOz (per 1 mol fuel).
Concentration Calculator
Free online Concentration Calculator. Quickly calculate and get instant results.
Crude Protein Calculator
Calculates crude protein (%) from nitrogen (%) using a selectable conversion factor (commonly 6.25).
Cubic Cell Calculator
Computes volume, face diagonal, and body diagonal of a cubic unit cell from its edge length.
Degree of Unsaturation Calculator
Calculates index of hydrogen deficiency (degree of unsaturation) from a molecular formula (ignoring oxygen/sulfur).
Detention Time Calculator
Computes hydraulic detention time (HRT) from tank volume and flow rate, returned in hours and minutes.
Diffusion Coefficient Calculator
Compute diffusion coefficient from RMS displacement using ⟨r²⟩ = 2 n D t.
Dilution Calculator (C1V1=C2V2)
Calculate dilution using C1V1 = C2V2.
Double Bond Equivalent Calculator
Calculate degrees of unsaturation (DBE) from formula: DBE = C − H/2 − X/2 + N/2 + 1.
Effective Charge Calculator
Compute effective nuclear charge using Z_eff = Z − S.
Electrolysis Calculator
Use Faraday’s law to compute charge, moles of electrons, moles of product, and mass from I, t, M, and n.
Electromotive Force Calculator
Calculate cell EMF via the Nernst equation: E = E° − (RT/nF) ln(Q).
Electron Configuration Calculator
Electron configuration needs discrete filling rules; not representable as a numeric-only expression here.
Electronegativity Difference
Calculate electronegativity difference and bond type.
Empirical Formula
Computes simplest mole ratios (A/min and B/min) as the basis for an empirical formula.
Enthalpy Calculator
Calculate enthalpy change (heat of reaction).
Entropy Calculator
Calculates entropy change using ΔS = q_rev / T (temperature in kelvin).
Enzyme Activity Calculator
Computes enzyme activity from spectrophotometric data using Beer–Lambert law and volume normalization.
Equilibrium Constant Calculator
Calculate equilibrium constant from concentrations.
Freezing Point Depression Calculator
Calculates freezing point depression using ΔTf = i · Kf · m.
Gibbs Energy Calculator
Computes Gibbs free energy change using ΔG = ΔH − TΔS.
Grahams Law of Diffusion Calculator
Calculates diffusion/effusion rate ratio using Graham’s law: r₁/r₂ = √(M₂/M₁).
Grams to Moles Calculator
Free online Grams to Moles Calculator. Quickly calculate and get instant results.
Half Life Calculator
Free online Half Life Calculator. Quickly calculate and get instant results.
Heat of Combustion Calculator
Finds molar heat of combustion from measured heat: ΔH_comb = −q/n (negative for exothermic).
Henderson-Hasselbalch Calculator
Calculate buffer pH using the Henderson-Hasselbalch equation.
Hydraulic Retention Time Calculator
Computes hydraulic retention time using HRT = V/Q (shown in hours and days).
Hydrogen Ion Concentration Calculator
Free online Hydrogen Ion Concentration Calculator. Quickly calculate and get instant results.
Ideal Gas Law (Chemistry)
Calculate using the Ideal Gas Law with R = 0.08206 L atm/(mol K).
Ionic Strength Calculator
Calculates ionic strength: I = 1/2 Σ cᵢ zᵢ² (up to 5 ion species).
Isoelectric Point Calculator
Estimates isoelectric point pI as the average of two relevant pKa values.
Kp Calculator
Computes Kp from Kc using Kp = Kc(RT)^Δn (R = 0.082057 L·atm·mol⁻¹·K⁻¹).
Langmuir Isotherm Calculator
Calculates Langmuir adsorption capacity qe = (qmax·KL·Ce)/(1 + KL·Ce).
Lattice Energy Calculator
Estimates lattice energy via Born–Landé: U = −(NA·A·z+z−·e²/4πε0r0)(1−1/n).
Liquid Ethylene Density Calculator
Provides a simple linear estimate of liquid ethylene density as a function of temperature.
Mass Percent Calculator
Compute mass percent (% w/w) from solute mass and total solution mass.
Michaelis Menten Equation
Calculate enzyme reaction rate v using the Michaelis–Menten equation.
Miller Indices Calculator
Compute reciprocals of plane intercepts (basis for Miller indices h, k, l).
Mixing Ratio Calculator
Calculate mixing ratio as solute-to-solvent mass ratio (g/g and g/kg).
Molality Calculator
Calculate molality of a solution.
Molar Mass Calculator
Calculate molar mass from mass and moles.
Molar Mass of Gas Calculator
Free online Molar Mass of Gas Calculator. Quickly calculate and get instant results.
Molar Ratio Calculator
Free online Molar Ratio Calculator. Quickly calculate and get instant results.
Molarity Calculator
Calculate the molarity of a solution.
Mole Calculator
Free online Mole Calculator. Quickly calculate and get instant results.
Mole Fraction Calculator
Free online Mole Fraction Calculator. Quickly calculate and get instant results.
Molecular Weight Calculator
Free online Molecular Weight Calculator. Quickly calculate and get instant results.
Moles Calculator
Calculate the number of moles.
Moles to Atoms Calculator
Free online Moles to Atoms Calculator. Quickly calculate and get instant results.
Nernst Equation Calculator
Calculate cell potential using Nernst equation.
Net Ionic Equation
Use net ionic stoichiometric coefficients to convert limiting-reactant moles to product moles.
Neutralization Calculator
Compute the base volume (mL) needed to neutralize a given acid solution using stoichiometric equivalents.
Normality Calculator
Calculate normality from molarity.
Osmotic Pressure Calculator
Calculate osmotic pressure using π = i·M·R·T (R = 0.082057338 L·atm·mol⁻¹·K⁻¹).
PKA Calculator
Uses Henderson–Hasselbalch: pKa = pH − log10([A−]/[HA]).
Partial Pressure Calculator
Compute partial pressure from Dalton’s law: P_i = x_i · P_total.
Percent Composition Calculator
Calculate percent composition of a compound.
Percent Ionic Character Calculator
Estimate percent ionic character from dipole moment and bond length: % = (μ_obs / (4.8032·r_Å))·100.
Percent Solution Calculator
Calculate mass percent of a solution: %w/w = (mass of solute ÷ mass of solution) × 100.
Percent Yield Calculator
Calculate percent yield of a reaction.
Percentage Concentration to Molarity Calculator
Free online Percentage Concentration to Molarity Calculator. Quickly calculate and get instant results.
Phase Rule
Gibbs phase rule: computes degrees of freedom F = C − P + 2.
Ppm to Molarity Calculator
Free online Ppm to Molarity Calculator. Quickly calculate and get instant results.
Protein Solubility Calculator
Computes protein solubility from mass and volume (mg/mL; numerically equals g/L).
Q10 Calculator
Temperature coefficient: Q10 = (R2/R1)^(10/(T2−T1)).
Radioactive Decay Calculator
Free online Radioactive Decay Calculator. Quickly calculate and get instant results.
Raoults Law
Raoult’s law for an ideal solution: P = Xsolvent·P° and ΔP/P°.
Rate Constant Calculator
Calculate the rate constant of a reaction.
Reaction Quotient Calculator
Computes reaction quotient Q from stoichiometric coefficients and activities (or concentrations/partial pressures).
Reaction Yield Calculator
Calculate percent yield of a chemical reaction.
Reconstitution Calculator
Calculates final volume needed to reconstitute a given solute mass to a target concentration (mg/mL).
Resuspension Calculator
Resuspension/dilution calculator using mass conservation: C1·V1 = C2·V2.
Saponification Value Calculator
Computes saponification value SV = (B−S)·N·56.1 / W in mg KOH per gram of sample.
Serial Dilution Calculator
Free online Serial Dilution Calculator. Quickly calculate and get instant results.
Solution Concentration Calculator
Calculate solution concentration.
Solution Dilution Calculator
Free online Solution Dilution Calculator. Quickly calculate and get instant results.
Specific Gravity Calculator
Calculate specific gravity.
Standard Temperature and Pressure Calculator
Calculates molar volume and gas volume at STP (IUPAC 100 kPa or 1 atm) using the ideal gas law.
Tds Calculator
Estimate TDS (mg/L) from EC (µS/cm) using a user-defined conversion factor.
Theoretical Yield Calculator
Free online Theoretical Yield Calculator. Quickly calculate and get instant results.
Titration Calculator
Compute analyte molarity from titration data using stoichiometric coefficients and volumes.
Two Photon Absorption Calculator
Free online Two Photon Absorption Calculator. Quickly calculate and get instant results.
Vapor Pressure Calculator
Estimate vapor pressure at a new temperature using the Clausius–Clapeyron relation.
Vapour Pressure of Water Calculator
Compute water saturation vapor pressure from temperature using the Antoine equation (mmHg and kPa).
Water Hardness Calculator
Calculate calcium, magnesium, and total water hardness expressed as mg/L as CaCO₃.
Young Laplace Equation
Computes pressure difference across a curved interface using the Young–Laplace equation.
pH Calculator
Calculate pH from hydrogen ion concentration.
pOH Calculator
Calculate pOH from hydroxide ion concentration.