Scientific Tools

Percent yield calculator free — find % yield, actual yield, or theoretical yield in grams or moles. Stoichiometry lab prep, no signup.

Empirical formula calculator free — find simplest formula from mass % or element masses. Mole ratios in your browser, no signup.

Molecular formula calculator free — find true formula from empirical formula and molar mass, or composition plus experimental M. No signup.

Ideal gas law calculator free — solve PV=nRT for pressure, volume, moles, or temperature. atm, kPa, L, K, °C. No signup.

Boyle's law calculator free — solve P1V1=P2V2 for pressure or volume at constant temperature. atm, kPa, L, mL. No signup.

Charles' law calculator free — solve V1/T1=V2/T2 for volume or temperature at constant pressure. K, °C, L, mL. No signup.

Combined gas law calculator free — solve P1V1/T1=P2V2/T2 for any unknown. Pressure, volume, temperature units. No signup.

Reaction stoichiometry calculator free — moles and grams from a balanced equation and known amount. Auto-balance, no signup.

Atomic mass calculator free — IUPAC element lookup or weighted isotope average. Atomic number and u/g/mol. No signup.

Electron configuration generator free — full and noble-gas notation for any element. Aufbau rules + exceptions. No signup.

Interactive periodic table with element details, atomic mass, and electron configuration for all 118 elements.

Find oxidation numbers in chemical formulas using standard rules — H2SO4, KMnO4, NH3, and polyatomic ions. Free, instant, browser-based.