Chemistry Tools & Calculators

Draw 2D molecular structures from SMILES notation. Visualize bonds, atoms, and stereochemistry as high-quality SVG.

Calculate pH from hydrogen ion concentration [H⁺], or find [H⁺] from pH. Also shows pOH, [OH⁻], and acidity classification.

Use the dilution equation C₁V₁ = C₂V₂ to calculate the final volume needed when diluting a solution to a target concentration.

Calculate the molar mass of any chemical compound from its molecular formula. Enter a formula like H2O, C6H12O6, or Ca(OH)2 and get the precise molar mass in g/mol.

Convert between moles, mass (grams), and number of particles. Enter any one value with the molar mass to calculate the other two.

Convert temperatures between Kelvin, Celsius, and Fahrenheit. Essential for chemistry calculations that require absolute temperature.

Solve the ideal gas law PV = nRT for any one unknown variable. Enter three of the four variables (pressure, volume, moles, temperature) and calculate the missing one.

Calculate the standard cell potential E°cell from the reduction potentials of the cathode and anode half-reactions.

Calculate Gibbs free energy (ΔG) from enthalpy (ΔH), entropy (ΔS), and temperature (T). Determine if a reaction is spontaneous.

Calculate the remaining amount of a radioactive substance after a given time, or find how long until a substance decays to a target fraction.

Calculate photon energy from wavelength or wavelength from energy using E = hc/λ. Also shows frequency and wavenumber.