Solutions & Concentrations

  • Boiling Point Elevation Calculator
    Calculate boiling point elevation (ΔTb) from molality, the ebullioscopic constant Kb, and the van't Hoff factor i. Free chemistry colligative-property tool.
  • Bleach Dilution Calculator
    Calculate how much bleach and water to mix to reach a target disinfectant concentration in ppm. Enter target ppm, total volume, and stock %.
  • Salt Solution Concentration Increase Calculator (Adding Salt)
    Find how much pure salt to add to a saline solution to raise its mass-percent concentration to a target value, plus the final mass and salt content.
  • Dilution Ratio Calculator
    Calculate how much water to add to a concentrate for any dilution ratio (e.g. 1:10). Get exact water and total mixed volume in your own units.
  • Pool Salt Calculator
    Calculate how much salt to add to your saltwater pool. Enter pool volume, current and target ppm to get pounds, kilograms, and 40 lb bags needed.
  • Pool Shock Calculator
    Calculate how much pool shock to add based on your pool volume and the free chlorine ppm increase you want. Supports cal-hypo, dichlor, and liquid chlorine.
  • Molarity Calculator
    Calculate molarity easily with this molarity calculator. Input the number of moles and volume in liters to determine the concentration of a solution. Accurate results for chemistry calculations.
  • Sulfur Dilution Calculator
    Calculate the mass of sulfur needed for any solution. Enter volume and desired concentration to get grams of sulfur required instantly.
  • Mizuwari Dilution Calculator
    Calculate how much liquor and water to mix for a water-cut "mizuwari" drink. Enter target strength, total volume and spirit ABV to get exact ml.
  • Mizuwari Dilution Calculator
    Work out how much water to add to whisky or shochu to dilute it to your target strength. Calculates water needed and the total mizuwari volume.
  • Cell Dilution Calculator
    Cell dilution calculator using C1V1 = C2V2. Find the stock cell volume and diluent needed to reach a target final concentration and volume.
  • Mixing Two Saline Solutions — Resulting Concentration Calculator
    Mix two saltwater solutions of different concentrations and instantly find the total salt, total mass, and the resulting concentration (mass-weighted average).
  • Saline Solution Dilution Calculator
    Find how much pure water to add to dilute a salt-water (saline) solution to a lower target concentration. Computes salt mass, final mass and water needed.
  • Alligation Calculator
    Use the alligation method to find the ratio and amounts of two solutions needed to reach a desired concentration. Free pharmacy & chemistry tool.
  • Alcohol Dilution Calculator
    Calculate how much water to add to dilute a spirit or alcohol to a lower target ABV. Enter initial volume, current ABV and target ABV.
  • Activity Coefficient Calculator
    Calculate the ionic activity coefficient γ using the Debye–Hückel limiting law from ion charge and ionic strength. Free chemistry tool.
  • SO₂ Wine Calculator
    Calculate how much potassium metabisulfite (KMS) to add to your wine to reach a target free SO₂ level, based on volume and current SO₂ in ppm.
  • Resuspension Volume Calculator
    Calculate the solvent volume needed to resuspend a substance to a desired concentration. Enter mass and target concentration to get volume in mL and µL.
  • Hydrogen Ion Concentration Calculator
    Convert between pH and hydrogen ion concentration [H+] instantly. Enter a pH to get [H+] = 10^(−pH), or enter [H+] to find pH, pOH, and [OH−].
  • Mole Fraction Calculator
    Calculate the mole fraction of a component from its moles and the total moles in a mixture. Free chemistry tool with formula, example and FAQ.
  • Normality Calculator
    Calculate the normality (N) of a solution from solute mass, equivalent weight, and volume. Free online chemistry concentration calculator with formula.
  • PPM to Molarity Calculator
    Convert ppm to molarity (mol/L) instantly. Enter concentration in ppm, molar mass, and solution density to get molarity and millimolarity.
  • Water Soluble Fertilizer Calculator
    Calculate how many grams of water-soluble fertilizer to dissolve to reach a target nitrogen ppm for a given water volume and fertilizer %N.
  • Ionic Strength Calculator
    Calculate the ionic strength of a solution from ion concentrations and charges using I = ½ Σ cᵢzᵢ². Supports up to four ion species.

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