Chemistry Calculators
Mass Fraction of an Element Calculator
Find the mass fraction (mass percent) of an element in a compound and the mass of the element in a sample, with a solution.
Oxidation State Calculator
Find the oxidation states of all elements in a compound or ion with a step-by-step solution.
Chemical Equation Balancer
Balance chemical equations online with a step-by-step solution and the electron balance for redox reactions.
Molar Mass Calculator
Find the molar mass of a compound from its formula (H2SO4, Ca(OH)2, CuSO4·5H2O) with a step-by-step solution and mass fractions.
Solubility Table
Solubility table of salts, acids and bases in water: formula and name of a compound from its ions and its solubility.
Gas Density Calculator
Relative density of a gas to hydrogen, air or oxygen, density at STP and molar mass of a gas, with a solution.
Solution Concentration (Mass Percent) Calculator
Mass percent of a solution: prepare, dilute, evaporate and mix solutions, the cross rule, with a step-by-step solution.
Empirical and Molecular Formula Calculator
Find the empirical and molecular formula from mass percentages, molar mass or gas density, with a step-by-step solution.
Moles Calculator: Mass, Moles, Volume, Particles
Convert between mass, moles, gas volume at STP and number of particles: n = m/M, n = V/Vm, n = N/NA, with a solution.
Atomic Structure and Electron Configuration Calculator
Protons, neutrons and electrons, electron configuration, shells and orbital diagram of any element or ion.
Stoichiometry Calculator
Solve stoichiometry problems: mass and volume of a product, limiting reactant, percent yield, with a step-by-step solution.
pH Calculator
pH of a strong acid or base solution, H+ and OH− concentrations, acidity and indicator colors, with a solution.
Molarity Calculator
Molar concentration c = n/V: mass needed to prepare a solution, mass percent to molarity, dilution, with a solution.
Interactive Periodic Table
Interactive periodic table: atomic mass, electron configuration, electronegativity and properties of every element.
Arrhenius Equation Calculator: Rate Constant and Activation Energy
The reaction rate constant, the activation energy from two experiments and the constant at another temperature.
Half-Life Calculator: Radioactive Decay
Radioactive decay N = N₀·2^(−t/T): amount remaining, decay time and half-life.
Gas Laws Calculator: Ideal Gas Law and Combined Gas Law
Ideal gas law pV = nRT and the combined gas law: pressure, volume, temperature and special processes.
Solution Concentration Converter: Mass Fraction, Molarity, g/L
Concentration converter: mass fraction, molarity and g/L, taking solution density into account. Step-by-step solution.
Pressure Converter: Pa, kPa, atm, bar, mmHg
Pressure converter: pascals, kPa, MPa, bars, atmospheres, mmHg. Exact conversion with a solution and a table.
Energy Converter: Joules, Calories, kWh, eV
Energy converter: J, kJ, calories, kilocalories, kWh and electronvolts. Conversion with a solution and a table.
Density Converter: kg/m³, g/cm³, g/L
Density converter: kg/m³, g/cm³, g/L, g/mL and t/m³. Exact conversion with a solution and a table.
Metal Activity Series
The electrochemical series of metals: what displaces hydrogen and which metals react with water.
Acids and Acid Residues
Formulas and names of school acids, their residues and the names of their salts.
Electronegativity Table
Pauling electronegativity of the elements, from the highest values to the lowest.
Acid-Base Indicators Table
The colours of litmus, phenolphthalein, methyl orange and universal indicator in acidic, neutral and alkaline media.
Chemistry calculators solve school problems step by step: from molar mass and moles to balancing equations with the electron balance and stoichiometry. Formulas are typed as plain text — H2SO4, Ca(OH)2, CuSO4·5H2O.
- Molar mass and mass fraction of an element from a formula.
- Amount of substance — mass, moles, gas volume and number of particles.
- Equation balancer — coefficients, electron balance, oxidizing and reducing agents.
- Stoichiometry — limiting reactant and percent yield.
- Solutions and molarity — dilution, mixing, the cross rule.
- Empirical formula and gas density.
- Oxidation states, atomic structure, pH.
- Periodic table and solubility table — interactive references.