Chemistry

  • 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.
  • Molecular Weight Calculator
    Compute molecular/formula weight in g/mol from any chemical formula like H2O or AgS2O3, with a per-element atomic-weight and contribution breakdown.
  • 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.
  • Volume from Molarity and Moles Calculator
    Calculate the volume of a solution from the number of moles of solute and its molarity using V = n / M. Free, instant chemistry tool.
  • 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.
  • Acid Molarity from Percent and Density Calculator (HCl/H₂SO₄)
    Convert a percent (% w/w) concentrated acid like HCl or H2SO4 into molarity (mol/L) using its density and molar mass. Free, instant chemistry 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.
  • 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.
  • Radioactivity Unit Conversion Calculator
    Convert radioactivity between Becquerel (Bq) and Curie (Ci) units. Enter an activity value and see all 12 SI and Curie-family units at once. 1 Ci = 3.7e10 Bq.
  • Osmolarity Calculator
    Calculate solution osmolarity in Osmol/L and mOsmol/L from solute molarity and the van't Hoff factor (number of dissociated particles).
  • Radiation Exposure Unit Conversion Calculator
    Convert radiation exposure between Roentgen (R, mR, uR) and Coulomb per kilogram (C/kg, mC/kg, uC/kg) using the exact 1 R = 2.58e-4 C/kg definition.
  • 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.

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