Chemistry

  • Pediatric Dose Volume Calculator
    Convert a weight-based dose (mg/kg) into the liquid volume (mL) to administer using the medication concentration. Quick, accurate dosing helper.
  • Hydrometer Temperature Correction Calculator
    Correct a hydrometer specific gravity reading for sample temperature versus calibration temperature using the water-density polynomial. Free online tool.
  • Proof to ABV Calculator (US)
    Convert alcohol proof to ABV (% alcohol by volume) instantly. Uses the US standard ABV = Proof ÷ 2. Enter any proof value to get the percentage.
  • Chlorine Solution Dilution Calculator
    Calculate how much stock chlorine (bleach) to dilute to reach a target ppm. Enter target ppm, final volume, and stock % to get the exact amount.
  • Volume of Water to Add for Target Molarity Calculator
    Calculate how much water to add to dilute a solution to a target molarity using the dilution equation C1V1 = C2V2. Fast and free.
  • Serum Osmolality Calculator
    Calculate estimated serum osmolality (mOsm/kg) from sodium, glucose, and BUN using the standard 2×Na + Glucose/18 + BUN/2.8 formula.
  • mEq/L Calculator
    Convert mg/L to mEq/L for any electrolyte using its valence and atomic weight. Free milliequivalents per liter calculator with worked examples.
  • ppm to Grains per Gallon Calculator
    Convert water hardness from ppm (mg/L) to grains per gallon (gpg) instantly. Uses gpg = ppm / 17.118 for accurate water softener sizing.
  • Percent Solution Dilution Calculator
    Calculate how much stock solution and diluent you need using C1V1=C2V2 with concentrations in percent. Get V1 and diluent volume instantly.
  • Original Concentration from Dilution Calculator
    Reverse the dilution equation to find the original concentration C1 from the final concentration C2, final volume V2, and initial volume V1.
  • Drug Infusion Rate from Dose Calculator
    Calculate IV infusion pump rate in mL/hr from a weight-based dose (mcg/kg/min) and solution concentration. Fast, accurate drip rate tool for clinicians.
  • Dilution Factor Calculator
    Calculate the dilution factor (fold) needed to reach a target concentration from a stock solution, plus stock and diluent volumes for a given final volume.
  • Concentration Unit Converter (mg/mL ↔ % w/v ↔ ppm)
    Convert between % w/v, mg/mL and ppm instantly. 1% w/v = 10 mg/mL = 10000 ppm. Fast solution concentration converter for lab and pharmacy.
  • 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.
  • Specific Gravity to ABV Calculator
    Convert hydrometer readings to alcohol by volume. Enter original (OG) and final gravity (FG) to estimate ABV for beer, wine, mead and cider.
  • 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.
  • Grams to Moles of Solution Calculator
    Calculate the grams of solute needed to make a solution of a target molarity and volume using mass = M × V(L) × molar mass.
  • % 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.
  • 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.
  • Molar Concentration Unit Converter
    Convert molar concentrations between M, mM, µM, nM and pM instantly. Includes micromolar to nanomolar and every other prefix conversion.
  • 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.
  • Antifreeze Mixture Calculator
    Calculate the final antifreeze (coolant) concentration percent by volume from your antifreeze and water amounts. Free, instant mixture ratio tool.
  • Potential Alcohol Calculator
    Estimate potential alcohol (% ABV) from your wine or must reading. Enter specific gravity or Brix to predict the final ABV if fermented to dry.

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