Chemistry

  • Molarity to Mass Percent Calculator
    Convert molarity (mol/L) to mass percent (% w/w) using molar mass and solution density. Free, instant chemistry concentration converter.
  • 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.
  • 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.
  • 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).
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • Half-Life Decay Calculator
    Calculate remaining quantity after radioactive or exponential decay using half-life. Get fraction remaining, amount decayed, decay constant and mean lifetime.
  • Grams of Product from Limiting Reactant Calculator
    Calculate grams of product formed from the limiting reactant using stoichiometry — enter masses, molar masses, mole ratio and optional percent yield.
  • Mass Percent to Moles Calculator
    Calculate moles of solute from molarity and volume using n = M × V. Enter mol/L and liters to get the amount of substance in moles instantly.
  • Ideal Gas Law Temperature Calculator
    Solve for temperature using the ideal gas law T = PV/(nR). Enter pressure, volume, and moles to get the gas temperature in K, °C, and °F.
  • 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.
  • 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.
  • Weak Base pH Calculator
    Calculate the pH of a weak base solution from its Kb and concentration. Computes [OH⁻], pOH, and pH instantly using the standard equilibrium approximation.
  • Valence Electrons Calculator
    Find the number of valence electrons for any element by atomic number (Z). Uses the outermost (highest n) s and p shell electron count from the electron configuration.
  • Enthalpy of Reaction from Formation Enthalpies Calculator
    Calculate the standard enthalpy of reaction (ΔH°rxn) using Hess's law from the sum of standard formation enthalpies of products and reactants.
  • Molar Mass Calculator
    Free molar mass calculator. Enter any chemical formula (H2O, C6H12O6, Ca(OH)2) to get the molar mass in g/mol from standard atomic weights.
  • pH Calculator
    Calculate pH from hydrogen ion concentration [H⁺], or find [H⁺] from pH. Get pOH, [OH⁻], and whether a solution is acidic, neutral, or basic.
  • Moles Calculator
    Calculate the number of moles from mass and molar mass using n = m / M. Free, instant chemistry mole calculator for students and labs.
  • Clausius–Clapeyron Vapor Pressure Calculator
    Estimate vapor pressure at a new temperature with the Clausius–Clapeyron equation. Enter P1, T1, T2 and ΔHvap to find P2 instantly.

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