Chemistry

  • pH of Strong Base Calculator
    Calculate the pH and pOH of a strong base solution from its molar concentration and number of hydroxide ions per formula unit at 25 °C.
  • Molarity to mg/mL Calculator
    Convert molarity (mol/L) to mg/mL using molecular weight. Free online molarity to mg/mL calculator for lab solution preparation and chemistry.
  • Final Volume After Dilution Calculator
    Calculate the final volume (V2) after diluting a solution using V2 = C1·V1 / C2. Find how much solvent to add to reach a target concentration.
  • Hydroxide Ion Concentration Calculator
    Convert pOH to hydroxide ion concentration [OH⁻] or back. Calculates [OH⁻], pOH, pH and [H⁺] instantly using [OH⁻] = 10^(−pOH).
  • Percent Purity Calculator
    Calculate percent purity of a chemical sample from the mass of the pure substance and the total sample mass. Free, instant percent purity calculator.
  • Percent Error Calculator (Chemistry)
    Calculate percent error in chemistry from experimental and theoretical values. Free percent error calculator with formula, worked example, and FAQ.
  • 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.
  • Reagent Molarity Calculator
    Calculate the molarity (mol/L) of a concentrated acid or reagent solution from its density, percent weight (%w/w) purity, and molar mass.
  • Gibbs Free Energy from Equilibrium Constant Calculator
    Calculate standard Gibbs free energy change ΔG° from the equilibrium constant K and temperature using ΔG° = −RT ln K. Free, instant results in kJ/mol.
  • Enthalpy Calculator
    Calculate enthalpy H = U + PV or the change in enthalpy ΔH = ΔU + PΔV from internal energy, pressure and volume in SI units (joules).
  • Crude Protein Calculator
    Calculate crude protein percentage from nitrogen content using the Kjeldahl conversion factor (default 6.25). Free, fast feed and food analysis tool.
  • Brix to Specific Gravity Calculator
    Convert degrees Brix (°Bx) to specific gravity (SG) instantly. Free brewing and winemaking tool using the standard Brix-to-SG formula.
  • Carbon-14 Dating Age Calculator
    Estimate the age of organic remains from the percentage of Carbon-14 left using radioactive decay and the C-14 half-life (5730 years).
  • Nuclear Binding Energy Calculator
    Calculate nuclear binding energy and mass defect from protons, neutrons and nuclear mass using E = Δm·c². Get binding energy per nucleon in MeV.
  • Molar Mass from Mass and Moles Calculator
    Calculate molar mass (g/mol) from a known mass and number of moles using M = mass ÷ moles. Fast, accurate chemistry tool with worked examples.
  • PPM to PPB Calculator
    Convert parts per million (ppm) to parts per billion (ppb) instantly. Just multiply by 1000. Free, accurate ppm to ppb conversion calculator.
  • Grams per Liter Calculator (g/L)
    Calculate concentration in grams per liter (g/L) by dividing mass in grams by volume in liters. Fast, accurate, and free online tool.
  • Pottery Glaze Batch Calculator
    Scale any pottery glaze recipe to your batch size. Enter percentages and dry weight to get exact gram amounts per ingredient plus water needed.
  • Percent Recovery Calculator
    Calculate percent recovery from a purification or recrystallization. Enter mass recovered and initial mass to get your % recovery and mass lost.
  • Reef Tank Salt Mix Calculator
    Calculate how much reef salt mix to add to your water to hit a target salinity (ppt). Enter water volume, target salinity, and your salt's dose rate.
  • 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.
  • Soap Lye Calculator
    Calculate the exact grams of NaOH lye and water needed for cold-process soap from your oil weight, SAP value, superfat percentage and water ratio.
  • 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.
  • 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.

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