Chemistry

  • Neutralization Calculator
    Solve acid-base neutralization and titration problems using M·V·n = M·V·n. Find unknown concentration or volume for full neutralization.
  • Percent Solution Calculator
    Calculate weight/volume percent (%w/v) of a solution, or solve for mass of solute or volume of solution using the standard %w/v formula.
  • Raoult's Law Calculator
    Calculate the vapor pressure of a solution with Raoult's Law: multiply the solvent mole fraction by the pure solvent vapor pressure. Free and instant.
  • Rate Law Calculator
    Calculate reaction rate from the rate law rate = k·[A]^m·[B]^n. Enter rate constant, concentrations and reaction orders to find rate and overall order.
  • Stoichiometry Mass-to-Mass Calculator
    Convert grams of a reactant to grams of product using molar mass and balanced equation coefficients. Free stoichiometry mass-to-mass calculator.
  • Molarity to Normality Calculator
    Convert molarity (M) to normality (N) instantly using N = M × n. Enter molarity and equivalents per mole to get solution normality for titrations.
  • Moles to Number of Particles Calculator
    Convert moles to the number of particles (atoms, molecules, ions) using Avogadro's number. Free, instant N = n × 6.022×10²³ calculator.
  • Enthalpy of Reaction from Formation Enthalpies Calculator
    Calculate the standard enthalpy of reaction (ΔH°rxn) using Hess's law from the sum of standard formation enthalpies of products and reactants.
  • Valence Electrons Calculator
    Find the number of valence electrons for any element by atomic number (Z). Uses the outermost (highest n) s and p shell electron count from the electron configuration.
  • Weak Base pH Calculator
    Calculate the pH of a weak base solution from its Kb and concentration. Computes [OH⁻], pOH, and pH instantly using the standard equilibrium approximation.
  • pH Calculator
    Calculate pH from hydrogen ion concentration [H⁺], or find [H⁺] from pH. Get pOH, [OH⁻], and whether a solution is acidic, neutral, or basic.
  • Moles Calculator
    Calculate the number of moles from mass and molar mass using n = m / M. Free, instant chemistry mole calculator for students and labs.
  • Molar Mass Calculator
    Free molar mass calculator. Enter any chemical formula (H2O, C6H12O6, Ca(OH)2) to get the molar mass in g/mol from standard atomic weights.
  • mEq to mg Calculator
    Convert milliequivalents (mEq) to milligrams (mg) for electrolytes like sodium, potassium, calcium and magnesium using atomic weight and valence.
  • Clausius–Clapeyron Vapor Pressure Calculator
    Estimate vapor pressure at a new temperature with the Clausius–Clapeyron equation. Enter P1, T1, T2 and ΔHvap to find P2 instantly.
  • Molar Solubility from Ksp Calculator
    Calculate the molar solubility (s) of a sparingly soluble salt from its Ksp and stoichiometry. Free chemistry tool with worked example and formula.
  • Milliliters to Grams Calculator
    Convert milliliters (mL) to grams using density. Enter volume and density to instantly get mass in grams and kilograms with the formula m = V × ρ.
  • pH of Weak Acid Calculator
    Calculate the pH of a weak acid solution from its Ka and initial concentration using the approximation [H⁺] = √(Ka·C). Free chemistry tool.
  • Concentrated Acid Molarity Calculator
    Calculate the molarity (mol/L) of a concentrated acid or stock solution from its mass percent, density, and molar mass with this free chemistry tool.
  • Antoine Equation Vapor Pressure Calculator
    Calculate vapor pressure from Antoine equation coefficients (A, B, C) and temperature. Get results in mmHg, atm, bar and kPa instantly.
  • Essential Oil Dilution Calculator
    Calculate how many drops of essential oil to add to your carrier oil for a safe dilution percentage. Fast, accurate drops-per-ml blending tool.
  • Half-Life Decay Calculator
    Calculate remaining quantity after radioactive or exponential decay using half-life. Get fraction remaining, amount decayed, decay constant and mean lifetime.
  • Grams of Product from Limiting Reactant Calculator
    Calculate grams of product formed from the limiting reactant using stoichiometry — enter masses, molar masses, mole ratio and optional percent yield.
  • Ideal Gas Law Temperature Calculator
    Solve for temperature using the ideal gas law T = PV/(nR). Enter pressure, volume, and moles to get the gas temperature in K, °C, and °F.

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