Solutions & Concentrations

  • Concentration After Dilution Calculator
    Calculate the final concentration of a diluted solution using C2 = (C1 × V1) / V2. Enter initial concentration, initial volume, and final volume.
  • Transmittance to Absorbance Calculator
    Convert percent transmittance (%T) to absorbance (A) instantly using A = -log10(%T/100). Free spectrophotometry calculator for lab and chemistry work.
  • mmol to mg Calculator
    Convert millimoles (mmol) to milligrams (mg) using molar mass. Enter the amount and molar mass to get the mass instantly with this free tool.
  • mg to mmol Calculator
    Convert milligrams (mg) to millimoles (mmol) using molar mass. Enter mass and molar mass to get amount of substance instantly.
  • Acid-Base Titration Volume Calculator
    Calculate the titrant volume needed to reach the equivalence point in an acid-base titration using Va·Ca·na = Vb·Cb·nb. Free and instant.
  • Solution Density Calculator
    Calculate the density of a solution from its total mass and total volume. Get results in g/mL and kg/m³ instantly with this free tool.
  • Number of Atoms Calculator
    Calculate the number of atoms or particles from moles using Avogadro number (6.022 x 10^23). Fast, accurate chemistry conversion tool.
  • Buffer Ratio for Target pH Calculator
    Find the conjugate base to acid ratio needed to hit a target pH from the buffer pKa using the Henderson-Hasselbalch equation.
  • Molarity After Mixing Two Solutions (Same Solute)
    Calculate the final molarity when mixing two solutions of the same solute. Enter each concentration and volume to get M_final = (M1V1 + M2V2)/(V1 + V2).
  • Buffer pH After Adding Strong Acid/Base Calculator
    Calculate the new pH of a buffer after adding strong acid or base using the Henderson-Hasselbalch equation. Enter pKa, moles of acid/base, and moles added.
  • Solute Mass from Mass Percent Calculator
    Calculate the mass of solute in a solution from its mass percent (% w/w) and total solution mass. Free, instant chemistry concentration tool.
  • Ksp from Solubility Calculator
    Calculate the solubility product constant (Ksp) from molar solubility for any AnBm salt. Enter s, n, and m to get Ksp and ion terms.
  • 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.
  • 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.
  • 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).

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