Solutions & Concentrations

  • Number of Moles Calculator
    Calculate the number of moles (n) from mass (m) and molar mass (M) using n = m/M. Fast, accurate chemistry mole calculator with worked examples.
  • Volume Percent Calculator (%v/v)
    Calculate volume percent concentration (%v/v) from the volume of solute and total volume of solution. Fast, free, and accurate for chemistry and labs.
  • mg/mL to Molarity Calculator
    Convert a mg/mL concentration to molarity (mol/L). Enter concentration and molar mass to get M, mM and µM instantly.
  • PPM to mg/L Calculator
    Convert ppm to mg/L instantly. Enter parts per million and solution density to get milligrams per liter. For water (density ≈1), ppm = mg/L.
  • Molarity to g/L Calculator
    Convert molarity (mol/L) to mass concentration in grams per liter (g/L) using the molar mass. Fast, accurate chemistry conversion tool.
  • Mass to Molarity Calculator
    Convert mass to molarity instantly. Enter solute mass (g), molecular weight (g/mol) and solution volume to get molar concentration (mol/L).
  • Dilution Volume Calculator
    Calculate the stock volume needed for a dilution using C1V1 = C2V2. Enter stock and final concentrations plus final volume to get V1 and solvent.
  • 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.
  • 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.
  • mEq to mg Calculator
    Convert milliequivalents (mEq) to milligrams (mg) for electrolytes like sodium, potassium, calcium and magnesium using atomic weight and valence.
  • 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.
  • Acid Dilution Preparation Calculator
    Calculate how much concentrated stock acid and water you need to prepare a dilute acid solution at a target molarity and volume using M1V1 = M2V2.

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