Solutions & Concentrations

  • PCR Master Mix Calculator
    Calculate PCR master mix component volumes from stock and final concentrations, reaction count and pipetting excess. Free lab tool with water balance.
  • Atoms to Moles Calculator
    Convert a number of atoms or particles to moles instantly using Avogadro's number (6.022 × 10²³). Free, accurate chemistry conversion tool.
  • Mass for Target ppm Solution Calculator
    Calculate the mass of solute (in mg and g) needed to make a solution at a target ppm concentration for any volume in liters. Free and instant.
  • Concentration to Absorbance Calculator
    Calculate absorbance from concentration using the Beer-Lambert law (A = ε·c·l). Enter molar absorptivity, concentration and path length to get A and %T.
  • Solid to Solution Molarity Calculator
    Calculate the molarity of a solution made by dissolving a solid and diluting to a fixed final volume. Enter mass, molecular weight, and volume.
  • Dilute Stock to Target Percent Calculator
    Calculate how much stock solution and water you need to dilute a concentrated solution to a target percent concentration using V1 = (C2·V2)/C1.
  • pH After Dilution Calculator
    Calculate the pH of a strong acid or base after dilution. Enter C1, V1 and V2 to get the diluted concentration C2, pH and pOH instantly.
  • Osmolarity Calculator
    Calculate solution osmolarity in Osmol/L and mOsmol/L from solute molarity and the van't Hoff factor (number of dissociated particles).
  • CFU/mL Calculator
    Calculate colony-forming units per mL (CFU/mL) from plate counts, dilution factor and volume plated. Free, instant microbiology bacterial count tool.
  • Dilution Calculator (Required Concentrate Volume)
    Calculate how much concentrate to use to make a target volume of diluted solution, by concentration or by dilution fold. For detergents, disinfectants, pesticides and more.
  • Molality Calculator
    Calculate molality (mol/kg) from moles of solute and mass of solvent. Free, instant chemistry solution concentration calculator with worked examples.
  • Solution Dilution Calculator
    Free dilution calculator using C1V1 = C2V2. Find how much stock solution and solvent you need to reach a target concentration and final volume.
  • Serial Dilution Calculator
    Calculate the final concentration after a serial dilution. Enter initial concentration, dilution factor, and number of steps to get Cₙ instantly.
  • Reconstitution Calculator
    Calculate final drug concentration after reconstitution and the exact volume to administer for a desired dose. Enter drug amount, diluent and dose.
  • TDS Calculator
    Convert electrical conductivity (EC in µS/cm) to total dissolved solids (TDS in ppm) using an adjustable conversion factor (0.5–0.7).
  • Titration Calculator
    Free titration calculator: find the unknown analyte concentration from titrant volume, concentration, and reaction stoichiometry. Fast acid-base & redox results.
  • Water Hardness Calculator
    Convert calcium and magnesium concentrations into total water hardness as mg/L CaCO3 and grains per gallon, with a soft-to-very-hard classification.
  • PPM Calculator
    Calculate concentration in parts per million (ppm) from mass of solute and mass of solution. Free online PPM calculator with formula and worked example.
  • Buffer pH Calculator
    Calculate the pH of a buffer solution from pKa and conjugate base/acid concentrations using the Henderson–Hasselbalch equation. Free and instant.
  • Buffer Capacity Calculator
    Calculate the buffer capacity (β) of a weak-acid buffer from its total concentration, pKa, and pH using the standard β formula.
  • Beer-Lambert Law Calculator
    Calculate absorbance with the Beer-Lambert law A = ε × c × l from molar absorptivity, concentration and path length. Also returns transmittance.
  • Percent Ionization Calculator
    Enter initial and equilibrium concentrations (mol/L) to compute percent ionization (%) and degree of dissociation for weak acids or bases.
  • Brine Calculator
    Brine calculator: enter your water weight and target brine percent to find exactly how many grams of salt you need for pickling and fermenting.
  • Boiling Point Elevation Calculator
    Calculate boiling point elevation (ΔTb) and the new boiling point of a solution from the van't Hoff factor, Kb constant, and molality.

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