Chemistry

  • 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.
  • Photoelectric Effect Calculator
    Compute the maximum kinetic energy of photoelectrons from light frequency and metal work function using Einstein's equation KE_max = hf − φ.
  • Decay Constant Calculator
    Calculate the radioactive decay constant λ from half-life using λ = ln(2)/t½. Choose seconds, minutes, hours, days or years. Free, instant.
  • 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.
  • Final Concentration After Mixing Two Solutions Calculator
    Calculate the final concentration when two solutions are mixed using C_final = (C1·V1 + C2·V2)/(V1+V2). Free, fast, and unit-agnostic.
  • 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.
  • 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.
  • 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.
  • 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.
  • Average Reaction Rate Calculator
    Calculate the average rate of a chemical reaction from concentration change over time, with stoichiometric coefficient correction for reactants or products.
  • Stock Solution Preparation Calculator
    Calculate the exact mass of solute needed to prepare a stock solution from molarity, volume, and molar mass. Free, fast and accurate.

Categories