Free Chemistry Calculators
That Show Every Step
Balance equations, find molar mass, solve pH, molarity, and gas law problems — with the formula and working shown for every answer. No signup. No limits.
Most Used Chemistry Tools
Fast, precise calculators for the problems students repeat every week.
Molecular Weight Calculator
Calculate molar mass from formulas with parentheses and bracket groups.
M = Σ(atomic mass × count)
Chemical Equation Balancer
Balance chemical equations and verify atom counts on both sides.
reactant atoms = product atoms
pH Calculator
Calculate pH, pOH, [H+], and [OH-] for acid-base problems.
pH = -log[H+]
Molarity Calculator
Solve concentration, moles, and volume with M = n/V.
M = n / V
Every Tool You Need
20+ free chemistry calculators, study guides, and reference pages built for students.
Free Calculators
Textbook Formulas
Every calculator follows the standard equations from general chemistry courses, with assumptions stated clearly.
Steps Shown
Results include the formula, substitution, and interpretation — so you learn the method, not just the number.
Instant & Private
Core calculators run directly in your browser. Nothing to install, no account, and no stored inputs.
Chemistry Study Guides
Explainers and reference charts that pair with the calculators.
SN1 vs SN2 Reactions
Substrate, nucleophile, solvent, and stereochemical clues for choosing SN1 or SN2.
9 min read
Study TipsHow to Draw Lewis Structures
A reliable electron-counting workflow for skeletons, octets, lone pairs, and formal charge.
8 min read
Physical ChemistryGibbs Free Energy Explained
What delta G means, how spontaneity works, and how enthalpy and entropy compete.
8 min read
Questions Students Ask
Yes. Every calculator, reference table, and study note on Chemistry Tools is free to use, with no signup, account, or download required.
Live tools include the molecular weight calculator, chemical equation balancer, pH calculator, molarity calculator, limiting reagent calculator, percent yield calculator, ideal gas law calculator, half-life calculator, dilution calculator, empirical formula calculator, Gibbs free energy calculator, boiling point reference, and an interactive periodic table.
Calculators use standard textbook equations and IUPAC atomic masses, and each result shows the formula and steps behind the answer. For laboratory or clinical decisions, always verify against official protocols.
Yes. Every tool is fully responsive with mobile-friendly inputs, single-column layouts, and touch-safe controls.
No. Core calculators run entirely in your browser and no calculator input is stored. The optional chemistry chat only sends a question to the server when you explicitly ask it.