Solutions & Concentrations

  • Number of Molecules Calculator
    Calculate the number of molecules in a sample from its mass in grams and molar mass using Avogadro number (6.022×10²³). Free chemistry tool.
  • Molarity from Grams and Volume Calculator
    Calculate molarity (mol/L) from grams of solute, molar mass, and solution volume. Free chemistry tool using M = (mass / molar mass) / volume.
  • Percent Composition of a Compound Calculator
    Calculate the percent composition by mass of an element in a chemical compound using number of atoms, atomic mass, and molar mass.
  • Grams to Moles Calculator
    Convert grams to moles instantly. Enter the mass and molar mass to find the amount of substance using n = mass / molar mass. Free chemistry tool.
  • Reaction Stoichiometry Mass Calculator
    Calculate the mass of product formed from a reactant using molar masses and balanced equation coefficients. Free stoichiometry calculator.
  • Percent Yield Calculator
    Calculate the percent yield of a chemical reaction from the actual and theoretical yield. Free chemistry calculator with formula and worked example.
  • Mole Ratio Calculator
    Free stoichiometry mole ratio calculator. Convert moles of substance A to moles of B using balanced equation coefficients. Fast, accurate, and easy.
  • mg/L to Molarity Calculator
    Convert a concentration in mg/L to molarity (mol/L) using the molar mass. Get results in M, mM, and µM instantly with this free calculator.
  • pOH Calculator from [OH⁻]
    Calculate pOH from hydroxide ion concentration using pOH = -log10([OH-]). Instantly find pOH and the corresponding pH at 25°C.
  • Theoretical Yield Calculator
    Calculate the theoretical yield in grams from moles of limiting reactant, reaction coefficients, and molar mass. Optionally find percent yield.
  • 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.
  • 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.

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