Chemistry

  • 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.
  • mEq to mg Calculator
    Convert milliequivalents (mEq) to milligrams (mg) for electrolytes like sodium, potassium, calcium and magnesium using atomic weight and valence.
  • 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.
  • Molar Solubility from Ksp Calculator
    Calculate the molar solubility (s) of a sparingly soluble salt from its Ksp and stoichiometry. Free chemistry tool with worked example and formula.
  • Milliliters to Grams Calculator
    Convert milliliters (mL) to grams using density. Enter volume and density to instantly get mass in grams and kilograms with the formula m = V × ρ.
  • Acid Dilution Preparation Calculator
    Calculate how much concentrated stock acid and water you need to prepare a dilute acid solution at a target molarity and volume using M1V1 = M2V2.
  • pH of Weak Acid Calculator
    Calculate the pH of a weak acid solution from its Ka and initial concentration using the approximation [H⁺] = √(Ka·C). Free chemistry tool.
  • Concentrated Acid Molarity Calculator
    Calculate the molarity (mol/L) of a concentrated acid or stock solution from its mass percent, density, and molar mass with this free chemistry tool.
  • Antoine Equation Vapor Pressure Calculator
    Calculate vapor pressure from Antoine equation coefficients (A, B, C) and temperature. Get results in mmHg, atm, bar and kPa instantly.
  • Essential Oil Dilution Calculator
    Calculate how many drops of essential oil to add to your carrier oil for a safe dilution percentage. Fast, accurate drops-per-ml blending tool.
  • 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.
  • Moles from Volume and Molarity 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.
  • 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.
  • 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).
  • Mass/Volume Percent (w/v) Calculator
    Calculate mass/volume percent (w/v%) of a solution from grams of solute and mL of solution. Instant w/v% concentration result with formula and examples.
  • Ideal Gas Volume Calculator
    Calculate the volume of an ideal gas from moles, temperature and pressure using the ideal gas law PV = nRT. Instant results in liters and mL.
  • 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.

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