Chemistry Calculators
Free chemistry tools for every need. All calculations happen in your browser. No signup, no tracking.
Arrhenius Equation Calculator: Rate Constant Solver
Solve the Arrhenius equation for rate constant, activation energy, or temperature. Compare reaction rates at different temperatures.
Avogadro's Law Calculator: Volume and Moles of Gases
Solve Avogadro's law V1/n1 = V2/n2 for any variable. Find gas volume from moles at constant temperature and pressure. Free, no signup.
Boyle's Law Calculator: P1V1=P2V2 Gas Law Solver
Calculate Boyle's Law (P1V1=P2V2) for gases at constant temperature. Solve for pressure or volume when any three variables are known.
Buffer pH Calculator: pH of Buffer Solutions
Calculate the pH of buffer solutions from Ka, acid concentration, and conjugate base concentration with the Henderson-Hasselbalch equation. Free.
Charles's Law Calculator: V1/T1=V2/T2 Gas Law
Calculate Charles's Law for gases. V₁/T₁ = V₂/T₂ at constant pressure. Find final volume or temperature when gas is heated or cooled.
Chemical Equation Balancer: Balance Equations Automatically
Balance chemical equations automatically using the algebraic method. Enter your unbalanced equation and get the balanced result instantly. Free.
Colligative Properties Calculator: Boiling, Freezing
Calculate boiling point elevation and freezing point depression. Find molality, van t Hoff factor effects, and new phase change temperatures.
Combined Gas Law Calculator: P1V1/T1 = P2V2/T2
Solve the combined gas law P1V1/T1 = P2V2/T2 for any unknown variable. Calculate final pressure, volume, or temperature when conditions change.
Dilution Calculator: M1V1=M2V2 Solver Online
Calculate dilution problems using M1V1=M2V2. Find the volume of stock solution needed or the final concentration after dilution. Essential for lab work.
Electrolysis Calculator: Faraday's Law Mass & Charge
Use Faraday's law to calculate mass deposited, charge, current, or time in electrolysis. Covers electroplating and metal refining.
Electron Configuration Calculator: Any Element
Get the full and noble-gas electron configuration for any element. Includes orbital diagrams and valence electrons. Free, no signup.
Empirical Formula Calculator: From % Composition
Calculate the empirical formula of a compound from percent composition data. Enter the percentage of each element to find the simplest whole-number ratio.
Equilibrium Constant Calculator: Kc, Kp & Reaction Quotient
Calculate Kc and Kp from equilibrium concentrations or pressures. Compare Q to K to predict reaction direction. Free, no signup.
Formal Charge Calculator: Lewis Structure Charges
Calculate formal charges on every atom in a Lewis structure. Identify the most stable resonance form instantly. Free, no signup.
Gay-Lussac's Law Calculator: Pressure and Temperature
Solve Gay-Lussac's law P1/T1 = P2/T2 for pressure or temperature changes at constant volume. Includes aerosol can safety examples.
Gibbs Free Energy Calculator: ΔG = ΔH − TΔS
Calculate Gibbs free energy change (ΔG) from enthalpy (ΔH), entropy (ΔS), and temperature. Determine if a reaction is spontaneous.
Heat of Reaction Calculator: ΔHrxn from Formation Enthalpies
Calculate the standard enthalpy of reaction using Hess's Law and standard enthalpies of formation. Enter reactants and products with coefficients. Free.
Henderson-Hasselbalch Calculator: Buffer pH Online
Calculate buffer solution pH using the Henderson-Hasselbalch equation: pH = pKa + log([A-]/[HA]). Essential for biochemistry and analytical chemistry.
Hess's Law Calculator: Enthalpy from Reaction Steps
Apply Hess's law to find reaction enthalpy from step enthalpies. Handles reversing and scaling of thermochemical equations.
Ideal Gas Law Calculator: Solve PV=nRT Online
Solve the ideal gas law PV=nRT for any variable. Enter pressure, volume, temperature, or moles and calculate the missing quantity instantly.
Ksp Calculator: Solubility Product Constant
Calculate the solubility product constant (Ksp) from ion concentrations, or find ion concentrations from Ksp. For solubility equilibrium. Free.
Limiting Reagent Calculator: Find Limiting Reactant
Find the limiting reagent in a chemical reaction from reactant masses and molar masses. Calculate theoretical yield and excess reactant amounts.
Molality Calculator: Moles per Kilogram of Solvent
Calculate molality from moles of solute and kilograms of solvent. Useful for boiling point elevation and freezing point depression problems. Free.
Molar Mass Calculator: Find Molecular Weight from Formula
Calculate the molar mass of any chemical compound instantly. Enter a chemical formula like H2O, NaCl, or C6H12O6 and get the molecular weight in g/mol.
Molarity Calculator: Calculate Moles per Liter of Solution
Calculate molarity (M) from moles of solute and volume of solution. Solve for any variable: moles, volume, or molarity. Essential for lab preparation.
Molecular Formula Calculator: Empirical Formula to Molecular
Calculate the molecular formula from the empirical formula and molar mass. Find the whole-number multiple that gives the true molecular formula.
Nernst Equation Calculator: Cell Potential Solver
Calculate cell potential under nonstandard conditions with the Nernst equation. Supports any temperature and electron count.
Oxidation Number Calculator: Find Oxidation States
Calculate oxidation numbers for elements in common compounds and ions. Includes rules for assigning oxidation states and examples for practice.
Partial Pressure Calculator: Dalton's Law for Gas Mixtures
Apply Dalton's law of partial pressures. Find each gas's partial pressure from mole fractions or total pressure. Free, no signup.
Percent Composition Calculator, % Mass of Each Element
Calculate the percent composition by mass of each element in a chemical compound. Enter the formula for a full mass-percentage breakdown. Free.
Percent Yield Calculator: Actual vs Theoretical Yield
Calculate percent yield from actual and theoretical yield. Find theoretical yield or actual yield. Essential for lab reports and chemistry class.
Stoichiometry Calculator: Mole Ratios and Mass Conversions
Calculate stoichiometry for any balanced chemical equation. Convert between grams and moles for reactants and products using mole ratios.
Strong Acid pH Calculator: Instant Results
Calculate the pH of any strong acid solution instantly. Enter molar concentration of HCl, HNO3, H2SO4 or others to find the exact pH. Free.
Theoretical Yield Calculator: Maximum Product Mass
Calculate theoretical yield from reactant masses and the balanced equation. Compare with actual yield for percent yield.
Titration Calculator: Molarity, Volume & Equivalence Point
Solve titration problems: find unknown molarity, required volume, or equivalence point pH for strong and weak acid-base titrations.
Vapor Pressure Calculator: Clausius-Clapeyron Equation
Calculate vapor pressure at any temperature using the Clausius-Clapeyron equation. Predict boiling points at altitude. Free, no signup.
pH Strong Base Calculator: pH from NaOH, KOH Concentration
Calculate the pH of strong base solutions like NaOH or KOH. Enter molarity to get pH, pOH, and hydroxide concentration instantly.
pH Weak Acid Calculator: pH from Ka and Concentration
Calculate the pH of a weak acid solution using Ka and initial concentration. Includes percent dissociation and equilibrium concentrations. Free.
pH Weak Base Calculator: pH from Kb and Concentration
Calculate the pH of a weak base solution using Kb (base dissociation constant) and initial concentration. Includes pOH and percent dissociation.
pH pOH Converter: [H+], [OH-] Interconversion
Convert between pH, pOH, hydrogen ion and hydroxide ion concentrations instantly. Includes acidity classification. Free, no signup.