Chemistry

  • Buffer Dilution Calculator
    Dilute a concentrated buffer (10X, 5X, 50X) to 1X. Enter final volume and fold to get stock and diluent volumes instantly.
  • 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.
  • Moles of Gas Calculator (PV = nRT)
    Calculate moles of an ideal gas from pressure, volume and temperature using PV = nRT. Enter P in atm, V in liters, T in kelvin to get n in moles.
  • pH to H+ Concentration Calculator
    Convert a pH value to hydrogen ion concentration [H+] using [H+] = 10^(−pH). Also returns pOH and [OH−]. Fast, accurate chemistry tool.
  • Dilution Factor from Volumes Calculator
    Calculate the dilution factor from sample and diluent volumes. DF = (V_sample + V_diluent) / V_sample. Free, instant lab dilution tool.
  • Percent Error Calculator (Chemistry)
    Calculate percent error in chemistry from experimental and theoretical values. Free percent error calculator with formula, worked example, and FAQ.
  • Mass of Solute from Molarity and Volume Calculator
    Calculate the mass of solute needed for a solution from its molarity, volume, and molar mass using m = M x V x MW. Fast and accurate for chemistry.
  • Water Vapor Pressure Calculator
    Calculate the saturation vapor pressure of water at any temperature using the Tetens formula. Get results in kPa, hPa (mbar), and mmHg.
  • mmol/L to mg/dL Calculator
    Convert mmol/L to mg/dL for glucose, cholesterol, creatinine, urea and more. Uses mg/dL = (mmol/L × MW) / 10 with selectable molecular weights.
  • mg/dL to mmol/L Calculator
    Convert mg/dL to mmol/L for glucose, cholesterol, triglycerides or any substance using its molecular weight. Fast, accurate clinical unit converter.
  • Path Length from Absorbance Calculator
    Calculate solution concentration from absorbance using the Beer-Lambert law: c = A / (ε · l). Enter absorbance, molar absorptivity, and path length.
  • pH Calculator from Concentration
    Calculate pH from hydrogen ion concentration [H+] using pH = -log10([H+]). Also returns pOH and [OH-]. Free, instant chemistry tool.
  • IV Drip Rate Calculator (gtt/min)
    Calculate IV drip rate in drops per minute (gtt/min) from volume, infusion time, and drop factor. Free, fast nursing flow-rate tool.
  • Grams per Gallon Fertilizer to PPM Calculator
    Convert grams of fertilizer per gallon or liter into N-P-K ppm. Enter weight, nutrient percentage, and water volume to get parts-per-million instantly.
  • A260/A280 Purity Ratio Calculator
    Calculate the A260/A280 absorbance ratio to assess DNA and RNA sample purity. Enter your spectrophotometer readings for an instant nucleic acid quality check.
  • RNA Concentration Calculator
    Calculate RNA concentration from A260 absorbance using the 40 ng/µL factor and dilution. Get ng/µL and total RNA yield in µg instantly.
  • pH from pOH Calculator
    Convert pOH to pH instantly with pH = 14 − pOH at 25°C. Also shows [H⁺] and [OH⁻] ion concentrations for any solution.
  • EC to TDS (ppm) Calculator
    Convert electrical conductivity (EC in µS/cm or mS/cm) to TDS in ppm using a 0.5, 0.64, or 0.7 conversion factor. Free, instant water quality tool.
  • mg/L to ppm Conversion Calculator
    Convert milligrams per liter (mg/L) to parts per million (ppm) for dilute aqueous solutions. Adjust for solution density. Also shows ppb.
  • Equilibrium Constant (Kc) Calculator
    Calculate the equilibrium constant Kc from product and reactant molar concentrations and their stoichiometric coefficients. Free chemistry tool.
  • Solubility Product (Ksp) Calculator
    Calculate the solubility product Ksp from equilibrium ion concentrations for any salt AaBb. Enter ion molarities and stoichiometric coefficients to get Ksp and pKsp.
  • Limiting Reagent Calculator
    Find the limiting reagent of any reaction. Enter the moles and stoichiometric coefficient of each reactant to see which runs out first.
  • OD600 to Cell Density Calculator
    Convert OD600 optical density to cell density (cells/mL) using a conversion factor. Estimate bacterial cell counts for E. coli and other cultures.
  • 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.

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