Chemistry

  • 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.
  • 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.
  • IV Infusion Rate Calculator
    Calculate IV infusion rate in mL/hr from total volume and time. Also computes drip rate (gtt/min) using a drop factor. Fast, free pump-rate tool.
  • Dose to Volume Calculator
    Convert an ordered medication dose into the volume to administer using stock concentration. Volume = Dose / Concentration. Fast, free dosage tool.
  • Gas Density Calculator
    Calculate the density of an ideal gas from pressure, molar mass, and temperature using ρ = PM/(RT). Free, instant results in kg/m³ and g/L.
  • Fold Dilution Calculator
    Calculate the fold dilution (X-fold) from sample and final volumes. Get the dilution factor and the diluent volume to add for any lab dilution.
  • Molarity of Concentrated Solution from Percent
    Calculate the molarity of a concentrated solution from its mass percent (% w/w), density, and molar mass using M = (10 × %w/w × density) / MW.
  • 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.
  • mg/kg Dosage Calculator
    Calculate a weight-based medication dose in mg using the mg/kg formula. Enter dose per kg and body weight (kg or lb) for instant results.
  • ABV to Proof Calculator
    Convert alcohol by volume (ABV %) to US proof instantly. US proof equals ABV multiplied by 2. Free, fast ABV to proof conversion tool.
  • 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.
  • 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.
  • ABV Calculator from Original & Final Gravity
    Calculate alcohol by volume (ABV%) for beer, wine, mead, or cider from your original gravity (OG) and final gravity (FG) readings.
  • De Broglie Frequency Calculator
    Solve the combined gas law P₁V₁/T₁ = P₂V₂/T₂ for the final pressure P₂. Enter initial pressure, volume, temperature plus final volume and temperature.
  • Isotope Percent Abundance Calculator
    Calculate the percent abundance of two isotopes from the average atomic mass and each isotope mass. Free, instant chemistry calculator with worked example.
  • Percent Recovery Calculator
    Calculate percent recovery from a purification or recrystallization. Enter mass recovered and initial mass to get your % recovery and mass lost.
  • Stock Volume Needed Calculator (V1 = C2V2 / C1)
    Find the stock volume (V1) needed to make a diluted solution. Solve V1 = (C2 × V2) / C1 from the dilution equation and get diluent to add.
  • pH to pOH Calculator
    Convert pH to pOH instantly with this free calculator. Uses pOH = 14 − pH at 25°C and shows H⁺ and OH⁻ ion concentrations.
  • Percent by Mass (%w/w) Calculator
    Calculate percent by mass (%w/w) of a solution from the mass of solute and the total mass of solution. Free, instant chemistry concentration tool.
  • Moles to Gas Volume at STP Calculator
    Convert moles of any ideal gas to volume at STP. Uses the molar volume of 22.414 L/mol. Fast, accurate chemistry calculator with worked examples.
  • Equilibrium Concentration Calculator (ICE Table)
    Solve the ICE-table equilibrium expression Kc = x²/(C₀−x) for x. Get equilibrium concentrations and percent dissociation instantly.
  • Significant Figures Calculator
    Free significant figures calculator: count the sig figs in any number and round a value to a chosen number of significant digits instantly.
  • Percent Yield from Grams Calculator
    Calculate percent yield from grams instantly. Enter actual and theoretical yield in grams to find your reaction's % yield using a simple formula.

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