Chemistry

  • Oxidation Number Calculator
    Calculate the unknown oxidation number of an element in any molecule or ion using the rule that all oxidation states sum to the overall charge.
  • Percentage Yield Calculator
    Calculate the percentage yield of a chemical reaction from actual and theoretical yields. Free chemistry % yield calculator with formula and worked example.
  • Moles to Grams Calculator
    Convert moles to grams instantly. Enter the amount in moles and the molar mass (g/mol) to find mass using mass = moles × molar mass.
  • Mass Needed for Molarity Calculator
    Calculate the mass of solute in grams needed to prepare a solution of a given molarity and volume. Enter molarity, volume, and molar mass.
  • Ka and pKa Calculator
    Convert between Ka and pKa instantly. Enter an acid dissociation constant to get pKa, or a pKa to get Ka using pKa = -log10(Ka).
  • PPM to Percent Calculator
    Convert parts per million (ppm) to percent instantly. Enter any ppm value and get the equivalent % using percent = ppm ÷ 10,000.
  • Percent to PPM Calculator
    Convert a percent concentration to parts per million (ppm) instantly. Enter a percentage and get the ppm value using ppm = percent × 10,000.
  • Molarity to Molality Calculator
    Convert molarity (mol/L) to molality (mol/kg) using solution density and solute molar mass. Free online chemistry conversion calculator with formula.
  • g/L to Molarity Calculator
    Convert grams per liter (g/L) to molarity (mol/L) instantly. Enter concentration and molar mass to get molar and millimolar values.
  • Molarity to PPM Calculator
    Convert molarity (mol/L) to parts per million (ppm) instantly. Enter molarity and molar mass to get ppm for dilute aqueous solutions.
  • Weak Acid pH from Ka Calculator
    Calculate the pH of a weak acid from its Ka and concentration using the exact quadratic equilibrium solution. Get [H+], pOH and percent dissociation.
  • pH of a Strong Acid Calculator
    Calculate the pH, [H⁺], and pOH of a strong monoprotic or polyprotic acid from its molar concentration and number of acidic protons.
  • Grams to Milliliters Calculator
    Convert grams to milliliters using density. Enter mass in grams and density in g/mL to get the volume instantly with the formula V = m / ρ.
  • Mass Percent Composition Calculator
    Calculate the mass percent composition of an element in a compound. Enter the element mass and total compound mass to get the percentage by mass instantly.
  • Alcohol By Volume (ABV) Calculator
    Calculate the alcohol by volume (ABV) of your beer, wine, or mead from original and final gravity readings using the standard ABV formula.
  • Half-Life Time Calculator
    Calculate the time required for a substance to decay from an initial quantity to a remaining amount using its half-life and the decay formula.
  • 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.
  • pH from Molarity Calculator
    Calculate pH from molarity for strong acids and bases. Uses pH = −log10(M) for acids and pH = 14 + log10(M) for strong bases. Includes pOH.
  • 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.

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