Chemistry Calculators
Molarity, pH, gas laws, stoichiometry, organic, analytical, biochem, and nuclear calculators.
Molarity Calculator
Calculate the molarity (molar concentration) of a solution given the moles of solute and volume of solution in liters.
Molality Calculator
Calculate the molality of a solution from moles of solute and mass of solvent in kilograms.
Dilution Calculator
Use the dilution equation M1V1 = M2V2 to find the final concentration or volume after diluting a solution.
Mass Percent Calculator
Calculate the mass percent of a solute in a solution given the mass of solute and total solution mass.
Volume Percent Calculator
Calculate the volume percent (v/v%) of a solute in a solution.
Mole Fraction Calculator
Calculate the mole fraction of each component in a two-component mixture.
PPM Calculator
Calculate parts per million (ppm) concentration from mass of solute and mass of solution.
Normality Calculator
Calculate normality from molarity and the equivalence factor (n-factor) of the solute.
Osmolarity Calculator
Calculate osmolarity from molarity and the van't Hoff factor (number of particles upon dissociation).
Solution Density Calculator
Calculate the density of a solution from its total mass and total volume.
Mass from Molarity Calculator
Calculate the mass of solute needed to prepare a solution of a given molarity and volume.
Volume from Molarity Calculator
Calculate the volume of solution needed to obtain a specific number of moles given the molarity.
Serial Dilution Calculator
Calculate the final concentration after multiple serial dilution steps.
Mixing Solutions Calculator
Calculate the final concentration when mixing two solutions of different concentrations and volumes.
Solubility Product Calculator
Calculate the solubility product constant (Ksp) from molar solubility and stoichiometric coefficients.
Saturation Concentration Calculator
Determine the maximum grams of solute that dissolve in a given mass of solvent based on known solubility.
Ionic Strength Calculator
Calculate the ionic strength of a solution from concentrations and charges of two ionic species.
Boiling Point Elevation Calculator
Calculate boiling point elevation using molality and the ebullioscopic constant.
Freezing Point Depression Calculator
Calculate the freezing point depression of a solution using molality and the cryoscopic constant.
Osmotic Pressure Calculator
Calculate osmotic pressure using the van't Hoff equation (pi = iMRT).
Molar Mass Calculator
Calculate the molar mass of a compound from the atomic masses and number of each element.
Moles to Grams Calculator
Convert moles of a substance to grams using its molar mass.
Grams to Moles Calculator
Convert grams of a substance to moles using its molar mass.
Avogadro's Number Calculator
Convert between moles and the number of particles using Avogadro's number (6.022 × 10^23).
Limiting Reagent Calculator
Determine the limiting reagent by comparing the mole ratios of two reactants.
Theoretical Yield Calculator
Calculate the theoretical yield of a product from the moles of limiting reagent and stoichiometry.
Percent Yield Calculator
Calculate the percent yield of a reaction from actual and theoretical yields.
Empirical Formula Calculator
Find the mole ratio of two elements from their mass percentages to determine the simplest formula ratio.
Molecular Formula Calculator
Find the molecular formula multiplier from the empirical formula mass and actual molar mass.
Mass-to-Mass Stoichiometry Calculator
Convert mass of a reactant to mass of product using stoichiometric ratios and molar masses.
Mole Ratio Calculator
Calculate the number of moles of product from moles of reactant using their stoichiometric coefficients.
Atom Count Calculator
Calculate the number of atoms in a given mass of a pure element.
Molecule Count Calculator
Calculate the number of molecules in a given mass of a compound.
Gas Volume at STP Calculator
Calculate the volume of a gas at standard temperature and pressure (0 C, 1 atm) from the number of moles.
Equivalent Weight Calculator
Calculate the equivalent weight of a substance from its molar mass and n-factor.
pH Calculator
Calculate the pH of a solution from the hydrogen ion concentration.
pOH Calculator
Calculate pOH from hydroxide ion concentration.
Hydrogen Ion Calculator
Calculate the hydrogen ion concentration from pH.
Hydroxide Ion Calculator
Calculate the hydroxide ion concentration from pOH or pH.
Ka Calculator
Calculate the acid dissociation constant (Ka) from equilibrium concentrations of a weak acid.
Kb Calculator
Calculate the base dissociation constant (Kb) from equilibrium concentrations of the conjugate acid, hydroxide ion, and undissociated base.
pKa Calculator
Calculate pKa from the acid dissociation constant Ka, or convert between Ka and pKa values.
pKb Calculator
Calculate pKb from the base dissociation constant Kb, or convert between Kb and pKb values.
Buffer pH Calculator
Calculate the pH of a buffer solution using the Henderson-Hasselbalch equation from pKa and the ratio of conjugate base to acid concentrations.
Titration Calculator
Calculate the unknown concentration of an acid or base using titration data: the volume and concentration of the titrant and the volume of the analyte.
Neutralization Calculator
Calculate the volume of base needed to neutralize a given volume and concentration of acid, or vice versa, for a 1:1 neutralization reaction.
Acid Dilution Calculator
Calculate the final concentration or volume needed when diluting an acid solution using the dilution equation C₁V₁ = C₂V₂.
Base Dilution Calculator
Calculate the final concentration or volume needed when diluting a base solution using the dilution equation C₁V₁ = C₂V₂.
Conjugate Acid-Base Calculator
Calculate the Ka of a conjugate acid from the Kb of its base (or vice versa) using the ion product of water Kw = Ka × Kb.
Ion Product of Water Calculator
Calculate the ion product of water (Kw) from hydrogen ion and hydroxide ion concentrations, or find one concentration given the other and Kw.
Ideal Gas Law Calculator
Calculate pressure, volume, moles, or temperature of an ideal gas using PV = nRT.
Combined Gas Law Calculator
Calculate the final pressure, volume, or temperature of a gas when conditions change using the combined gas law P₁V₁/T₁ = P₂V₂/T₂.
Dalton's Law Calculator
Calculate the total pressure of a gas mixture from individual partial pressures using Dalton's Law of Partial Pressures.
Graham's Law Calculator
Calculate the ratio of effusion or diffusion rates of two gases using Graham's Law, based on their molar masses.
Gas Density Calculator
Calculate the density of a gas from its molar mass, pressure, and temperature using the ideal gas law rearranged as d = PM/(RT).
RMS Speed Calculator
Calculate the root-mean-square speed of gas molecules from temperature and molar mass using kinetic molecular theory.
Mean Free Path Calculator
Calculate the mean free path of gas molecules, the average distance traveled between collisions, from temperature, pressure, and molecular diameter.
Compressibility Factor Calculator
Calculate the compressibility factor (Z) of a real gas, which measures how much the gas deviates from ideal gas behavior.
Van der Waals Calculator
Calculate the pressure of a real gas using the Van der Waals equation, which corrects for intermolecular attractions and molecular volume.
Molar Volume Calculator
Calculate the molar volume of a gas at any temperature and pressure using the ideal gas law. At STP, the molar volume of an ideal gas is 22.414 L/mol.
Enthalpy Change Calculator
Calculate the enthalpy change of a reaction from the sum of enthalpies of formation of products minus reactants.
Hess's Law Calculator
Apply Hess's Law to calculate the overall enthalpy change by summing enthalpy changes of individual steps in a reaction pathway.
Calorimetry Calculator
Calculate the heat absorbed or released in a reaction using calorimetry data: mass, specific heat capacity, and temperature change.
Bond Energy Calculator
Estimate the enthalpy change of a reaction from the total bond energies broken in reactants minus bonds formed in products.
Heat of Reaction Calculator
Calculate the heat released or absorbed per mole of reaction from calorimetry data: total heat measured and moles of limiting reagent.
Gibbs Free Energy Calculator
Calculate Gibbs free energy change (ΔG) from enthalpy change (ΔH), entropy change (ΔS), and temperature to determine reaction spontaneity.
Equilibrium Constant Calculator
Calculate the equilibrium constant (K) from the standard Gibbs free energy change (ΔG°) and temperature using ΔG° = -RT ln(K).
Reaction Quotient Calculator
Calculate the reaction quotient (Q) for a reaction aA + bB → cC + dD from current concentrations, and compare it to K to predict reaction direction.
Activation Energy Calculator
Calculate the activation energy (Ea) of a reaction from rate constants at two different temperatures using the Arrhenius equation.
Rate Constant Calculator
Calculate the rate constant (k) at a given temperature from the activation energy and pre-exponential factor using the Arrhenius equation k = Ae^(-Ea/RT).
Cell Potential Calculator
Calculate the standard cell potential (E°cell) of an electrochemical cell from the standard reduction potentials of the cathode and anode.
Nernst Equation Calculator
Calculate the cell potential under non-standard conditions using the Nernst equation, accounting for concentration effects.
Faraday's Law Calculator
Calculate the mass of substance deposited or dissolved during electrolysis using Faraday's Law from current, time, molar mass, and charge number.
Electrolysis Time Calculator
Calculate how long electrolysis must run to deposit a target mass of substance, given the current, molar mass, and charge number.
Mass Deposited Calculator
Calculate the mass deposited during electrolysis from the total charge passed, molar mass of the substance, and charge number of the ion.
Electron Configuration Calculator
Calculate key electron configuration properties including the number of electrons in each shell, valence electrons, and core electrons from the atomic number.
Effective Nuclear Charge Calculator
Calculate the effective nuclear charge (Z_eff) experienced by a valence electron using Slater's rules, from the atomic number and shielding constant.
Lattice Energy Calculator
Estimate the lattice energy of an ionic compound using the Born-Landé equation from ion charges, interionic distance, and the Madelung constant.
Atomic Radius Trend Calculator
Estimate the relative atomic radius from effective nuclear charge and principal quantum number using the simplified relationship r ~ n²/Z_eff.
Ionization Energy Calculator
Estimate the ionization energy of an atom using the hydrogen-like approximation IE ≈ 13.6 × Z_eff² / n² eV, from effective nuclear charge and principal quantum number.
Molecular Weight Calculator
Calculate the molecular weight of a compound from the number and atomic masses of each element present.
Degree of Unsaturation Calculator
Calculate the degree of unsaturation (index of hydrogen deficiency) from a molecular formula containing C, H, N, and halogens.
Rf Value Calculator
Calculate the retention factor (Rf) in thin-layer chromatography from the distance traveled by the solute and solvent front.
Percent Yield Calculator
Calculate the percent yield of a chemical reaction from actual and theoretical product amounts.
Atom Economy Calculator
Calculate atom economy to assess how much of the reactant atoms end up in the desired product versus waste byproducts.
E-Factor Calculator
Calculate the environmental factor (E-factor) measuring the mass of waste produced per unit mass of desired product.
Reaction Quotient Calculator
Calculate the reaction quotient Q for a reaction aA + bB -> cC + dD to determine reaction direction relative to equilibrium.
Equilibrium Constant Shift Calculator
Calculate how the equilibrium constant K changes with temperature using the van't Hoff equation.
Activation Energy (Arrhenius) Calculator
Calculate activation energy from rate constants at two temperatures using the Arrhenius equation.
Half-Life (First Order) Calculator
Calculate the half-life of a first-order reaction from its rate constant, or find the rate constant from a known half-life.
Beer-Lambert Law Calculator
Calculate absorbance, concentration, or path length using the Beer-Lambert law for spectrophotometry.
Calibration Curve Calculator
Calculate an unknown concentration from a linear calibration curve using slope, intercept, and measured signal.
Signal-to-Noise Ratio Calculator
Calculate the signal-to-noise ratio (S/N) for analytical measurements to assess data quality and detection capability.
Detection Limit Calculator
Calculate the limit of detection (LOD) and limit of quantitation (LOQ) from blank standard deviation and calibration sensitivity.
Resolution (Chromatography) Calculator
Calculate chromatographic resolution between two adjacent peaks from their retention times and peak widths.
Retention Factor Calculator
Calculate the retention factor (k') in column chromatography from retention time and void time.
Plate Number Calculator
Calculate the number of theoretical plates (N) and plate height (HETP) for chromatographic column efficiency.
Peak Asymmetry Calculator
Calculate the asymmetry factor (tailing factor) of a chromatographic peak at 10% peak height.
Mass Accuracy Calculator
Calculate mass accuracy in parts per million (ppm) for mass spectrometry measurements.
Isotope Pattern Calculator
Estimate the M+1 and M+2 peak intensities relative to the monoisotopic peak from the molecular formula.
Enzyme Kinetics (Michaelis-Menten) Calculator
Calculate the reaction velocity for an enzyme-catalyzed reaction using Michaelis-Menten kinetics.
Lineweaver-Burk Calculator
Calculate the Lineweaver-Burk (double reciprocal) plot values from Vmax and Km for enzyme kinetics linearization.
Enzyme Inhibition Calculator
Calculate apparent kinetic parameters under competitive or noncompetitive enzyme inhibition.
Protein Molecular Weight Calculator
Estimate protein molecular weight from the number of amino acid residues using the average residue mass.
DNA Melting Temperature Calculator
Calculate the melting temperature (Tm) of a DNA oligonucleotide using the Wallace rule and the nearest-neighbor approximation.
PCR Primer Tm Calculator
Calculate PCR primer melting temperature with salt concentration correction for annealing temperature selection.
Protein Concentration (Bradford) Calculator
Calculate protein concentration from Bradford assay absorbance using a linear calibration curve.
Beer-Lambert Protein Calculator
Calculate protein concentration from UV absorbance at 280 nm using the Beer-Lambert law and known extinction coefficient.
Cell Doubling Time Calculator
Calculate the doubling time of a cell culture from cell counts at two time points during exponential growth.
Growth Rate Constant Calculator
Calculate the specific growth rate constant and predict population size at a future time point.
Radioactive Decay (Advanced) Calculator
Calculate remaining activity, number of atoms, and mass of a radioactive isotope after a specified time period.
Half-Life Remaining Amount Calculator
Calculate the remaining amount of a substance after a given number of half-lives have elapsed.
Activity (Becquerel) Calculator
Calculate radioactive activity in Becquerels from the number of atoms and decay constant, with Curie conversion.
Decay Chain Calculator
Calculate daughter nuclide buildup in a two-member radioactive decay chain (parent to daughter).
Neutron Flux Calculator
Calculate neutron flux from neutron density and velocity, or the reaction rate in a material.
Cross Section Reaction Calculator
Calculate the macroscopic cross section from microscopic cross section and atom number density for nuclear reactions.
Binding Energy per Nucleon Calculator
Calculate the total binding energy and binding energy per nucleon from the mass defect of a nucleus.
Mass Defect Calculator
Calculate the mass defect of a nucleus from its number of protons, neutrons, and measured atomic mass.
Nuclear Fission Energy Calculator
Calculate the energy released per fission event from the mass difference between reactants and products.
Nuclear Fusion Energy Calculator
Calculate the energy released in a nuclear fusion reaction from the mass difference between reactants and products.