Chemistry

  • Milliliters to Grams Calculator
    Convert milliliters (mL) to grams (g) using density. Enter volume and density or pick a preset (water, milk, oil, flour, sugar, honey) for instant results.
  • Concentration Calculator
    Calculate molar concentration (molarity) from moles of solute and volume of solution. Free online concentration calculator with worked examples.
  • Henderson-Hasselbalch Calculator
    Calculate buffer solution pH with the Henderson-Hasselbalch equation from pKa and the conjugate base to weak acid concentration ratio.
  • Mass Percent Calculator
    Calculate mass percent (% w/w) of a solution from the mass of solute and total solution mass. Free, instant chemistry concentration calculator.
  • Mixing Ratio Calculator
    Calculate a mixing ratio A:B, each component's fraction and percent, and the exact amount of each part needed to make any total quantity.
  • Dilution Factor Calculator
    Calculate the dilution factor from initial sample volume and final volume. Get fold dilution and the amount of diluent to add for any lab dilution.
  • Percentage Concentration to Molarity Calculator
    Convert percent by weight (% w/w) concentration to molarity using density and molar mass. Fast, accurate chemistry tool for solution preparation.
  • 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.
  • Frequency to Wavelength Calculator
    Convert frequency to wavelength with λ = c/f. Enter frequency in Hz, kHz, MHz, GHz, or THz to get wavelength in meters and nanometers instantly.
  • 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.
  • Atoms / Molecules to Moles Calculator
    Convert a number of atoms, molecules or particles to moles using Avogadro's number (n = N / 6.022×10²³). Fast, accurate chemistry tool.
  • Percent Error Calculator
    Calculate percent error from experimental and theoretical values. Enter measured and actual values to get relative error as a percentage instantly.
  • Water to Add for Dilution Calculator
    Find how much water to add to dilute a solution from one concentration to a lower target. Uses V_water = V1·(C1−C2)/C2. Free and instant.
  • Molarity from Density & Mass Percent Calculator
    Calculate the molarity (mol/L) of a solution from its density, mass percent concentration, and the solute's molar mass with this free chemistry tool.
  • 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.

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