General chemistry calculators
Atoms, elements, bonds, and chemical quantities. Choose a tool below to calculate a result and understand the science behind it.
9 free calculators · No ads · No sign-up
- Atom Calculator
Find protons, neutrons and electrons from an atom’s atomic number, mass number and charge.
- Atomic Mass Calculator
Estimate an isotope’s mass from its proton and neutron counts, with the mass number shown separately.
- Average Atomic Mass Calculator
Calculate an abundance-weighted atomic mass from any list of isotope masses and percentages.
- Bond Order Calculator
Calculate molecular-orbital bond order from bonding and antibonding electron counts.
- Electronegativity Calculator
Compare Pauling electronegativities and explore the direction and approximate character of a bond.
- Mass Concentration to Molar Concentration Conversion
Convert between mass per volume and moles per volume using the solute’s molar mass.
- Molar Mass Calculator
Calculate molar mass, atom counts and elemental mass contributions from a chemical formula.
- Percent Composition Calculator
Find each element’s contribution to a compound’s total mass from its chemical formula.
- pKa Calculator
Find pKa from an acid dissociation constant or from a buffer’s pH and conjugate-pair concentrations.
More to explore
Curiosity rarely stays in one category. Browse our complete collection or use the search at the top of the page to find a specific calculation.