About Periodixy
Periodixy is a free chemistry study platform built around one idea: tools should teach, not just answer. Every calculator on this site shows the formula it used and walks through the substitution, because the number matters less than the method you'll need in the exam hall.
What we offer
- An interactive periodic table of all 118 elements with nine exploration modes — trends, temperature states, discovery history, quizzes, a formula builder and more.
- Fifteen chemistry calculators covering molar mass, equation balancing, stoichiometry, pH, dilution, gas laws, oxidation numbers and unit conversion — each with worked examples and common-mistake warnings.
- A detailed page for every element: atomic data, properties, uses, history, compounds, safety notes and practice questions.
- Twenty study guides written in clear, global English for high-school and early-college students.
- Quizzes, flashcards and printable tables for revision.
Who it's for
Primarily students meeting chemistry for the first or second time — roughly ages 13 to 20 — plus the teachers and tutors who support them, anywhere in the world. We use SI units by default, avoid country-specific assumptions, and keep the language simple without dumbing the chemistry down.
Free, for real
Everything works without an account, sign-up, or payment. The site may show clearly-labelled advertising to cover its costs, placed so it never interferes with the tools — see our editorial policy.
Accuracy and corrections
Element data comes from a structured scientific dataset; where values are unknown or vary between sources, we say “Not available” rather than inventing precision. Chemistry is also a living science — values get re-measured. If you spot an error, please tell us: corrections are reviewed and applied to the underlying data files. More detail on our data sources page.