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.
  • mg to mmol Calculator
    Convert milligrams (mg) to millimoles (mmol) using molar mass. Enter mass and molar mass to get amount of substance instantly.
  • 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.
  • Final Volume to Dilute to Target Concentration Calculator
    Calculate the final volume (V2) to dilute a stock solution to a target concentration using C1V1 = C2V2. Free dilution calculator with solvent-to-add output.
  • Theoretical Yield Calculator
    Calculate the theoretical yield in grams from moles of limiting reactant, reaction coefficients, and molar mass. Optionally find percent yield.
  • pOH Calculator from [OH⁻]
    Calculate pOH from hydroxide ion concentration using pOH = -log10([OH-]). Instantly find pOH and the corresponding pH at 25°C.
  • Specific Gravity to Density Calculator
    Convert specific gravity (SG) to density. Multiply SG by the reference water density (1000 kg/m³) to get density in kg/m³, g/cm³ and g/L instantly.
  • 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.
  • % w/w to Molarity Calculator
    Convert percent by weight (% w/w) to molarity using solution density and molecular weight. Free chemistry calculator: M = (10 × %w/w × ρ) / MW.
  • Reaction Stoichiometry Mass Calculator
    Calculate the mass of product formed from a reactant using molar masses and balanced equation coefficients. Free stoichiometry calculator.
  • Final Concentration from Dilution Factor Calculator
    Calculate the final concentration of a diluted solution from its stock concentration and dilution factor using C_final = C_stock / DF.
  • 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.
  • Molar Concentration Unit Converter
    Convert molar concentrations between M, mM, µM, nM and pM instantly. Includes micromolar to nanomolar and every other prefix conversion.
  • 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.
  • %w/v to Molarity Calculator
    Convert a percent weight/volume (%w/v) concentration to molarity (mol/L) instantly. Enter the %w/v and molar mass to get the molar concentration.
  • Alcohol Proof to Percentage (ABV) Calculator
    Convert US alcohol proof to percentage alcohol by volume (ABV) instantly. Just divide proof by 2 — enter the proof to get the exact ABV percentage.
  • Moles to Molarity Calculator
    Convert moles of solute and solution volume into molarity (mol/L). Free chemistry concentration calculator with formula, example, and FAQ.
  • pH After Mixing Strong Acid and Base Calculator
    Calculate the pH after mixing a strong acid and strong base. Enter concentrations and volumes to find excess ions, ion concentration, and final pH.
  • Nernst Equation Calculator
    Calculate cell potential (EMF) with the Nernst equation at 25°C. Enter standard potential E°, electrons transferred n, and reaction quotient Q.
  • pH of Weak Base Calculator
    Calculate the pH, pOH and [OH⁻] of a weak base solution from its Kb and concentration using the square-root approximation [OH⁻] = √(Kb·C).
  • Liters to Moles Calculator
    Convert liters of gas to moles using the molar volume. At STP a gas occupies 22.4 L/mol, so n = V / 22.4. Fast, accurate chemistry conversion.
  • % w/v to mg/mL Calculator
    Convert percent weight/volume (% w/v) concentration to milligrams per milliliter (mg/mL) instantly. Uses mg/mL = %w/v × 10. Free pharmacy & lab tool.
  • Antifreeze Mixture Calculator
    Calculate the final antifreeze (coolant) concentration percent by volume from your antifreeze and water amounts. Free, instant mixture ratio tool.
  • Moles to Liters Calculator (Gas at STP)
    Convert moles of gas to liters at STP using the molar volume (22.4 L/mol). Fast, accurate moles-to-volume calculator for chemistry problems.

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