Free Interactive Chemistry Tools for Students

Explore the periodic table, calculate molar mass, balance equations, solve pH problems, compare elements, and learn chemistry step by step.

Open Periodic Table Browse Chemistry Calculators

Try “oxygen”, “Fe”, “molar mass”, or a formula like H2O, CO2, NaCl, CaCO3

One table, nine ways to explore it

Hover for quick facts, click for deep dives — then switch modes for property heat maps, trends, a temperature slider, discovery timeline, memorisation quiz, formula builder and element comparison.

Open the full interactive periodic table →

Popular chemistry tools

Molar Mass CalculatorCalculate the molar mass of any chemical formula with a full element-by-element breakdown and percent composition.Chemical Equation BalancerBalance any chemical equation instantly and check atom conservation on both sides.Electron Configuration CalculatorFind the full and noble-gas electron configuration, shell distribution and valence electrons of any element.pH and pOH CalculatorConvert between pH, pOH, [H⁺] and [OH⁻], and see whether a solution is acidic, basic or neutral.Stoichiometry CalculatorConvert between grams and moles of any two substances in a balanced equation using mole ratios.Chemistry Unit ConverterConvert temperature, pressure, volume, mass, moles, energy and concentration units.

See all 18 tools →

Explore by chemistry topic

The Periodic Table118 elements, 9 interactive modes Periodic TrendsRadius, ionization energy, electronegativity Moles & Molar MassThe core skill of chemistry class Chemical ReactionsBalancing, stoichiometry, yields Acids & BasespH, pOH and the 0–14 scale Atomic StructureShells, subshells and configurations

Why students use Periodixy

Free, no sign-up

Every tool works instantly — no account, no paywall, no downloads.

Steps, not just answers

Each calculator shows its formula and working so you learn the method.

Built for students

Clear language for high-school and early-college chemistry, worldwide.

Works everywhere

Phone, tablet or laptop — the periodic table adapts to every screen.

Careful with facts

Structured element data; unknown values say “not available”, never guessed.

Made for revision

Quizzes, flashcards and printables that make facts stick before tests.

Jump straight to an answer

One click pre-fills the calculator with a classic problem:

MolarmassofH₂O MolarmassofCaCO₃ MolarmassofC₆H₁₂O₆ MolarmassofCuSO₄·5H₂O %compositionofCO₂ BalanceH₂+O₂→H₂O Electronconfigofiron

See the periodic trends, don't memorise them

Atomic radius, ionization energy, electronegativity and metallic character all follow visible patterns across the table. Our trends explorer colours all 118 elements by each property, pairs the picture with a one-line rule, and explains the “why” behind it.

Explore periodic trends →

Make it stick: quizzes & flashcards

Element Symbol Quiz

See an element name, pick the right symbol. Watch out for the Latin ones — iron is not “Ir”!

Atomic Number Quiz

Match elements to their atomic numbers — the proton count that defines each element.

Element Name Quiz

See a symbol, pick the element. Is Sn tin or selenium?

Element Flashcards

Flip-card practice with shuffle mode and category filters.

Printable periodic tables

Full colour, black-and-white, blank quiz versions, with or without masses, with electron configurations — configured in your browser and printed in one click.

🖨️ Get printable tables

Latest study guides

Study guidePeriodic Table Explained: Groups, Periods & How to Read ItThe periodic table lists all 118 elements in 18 groups and 7 periods. Learn how it is organised, what each tile means, and how to read groups and periods.Study guideMolar Mass: Definition and How to Calculate ItWhat is molar mass, and how do you find it? Add up the atomic masses in a formula to get grams per mole. Worked examples for H2O, glucose, Ca(OH)2 and NaCl.Study guideHow to Balance Chemical EquationsLearn to balance chemical equations step by step using the counting method, with combustion and metal-acid examples plus the most common mistakes.Study guideElectron Configuration ExplainedUnderstand electron configurations: shells, s/p/d/f subshells, the Aufbau principle, Pauli exclusion, Hund's rule, noble gas shorthand and famous exceptions.Study guidePeriodic Trends ExplainedMaster the four main periodic trends — atomic radius, ionization energy, electronegativity and metallic character — with directions, reasons and examples.Study guideAtomic Number vs Atomic MassAtomic number counts protons; atomic mass averages isotope masses. Learn the difference, what mass number means, and how to use all three correctly.

Browse all 22 study guides →

Questions students ask us

Is Periodixy completely free?

Yes. The interactive periodic table, all calculators, quizzes, flashcards, printables and study guides are free, with no account or sign-up required.

Who is Periodixy for?

Primarily high-school and early-college chemistry students, plus the teachers and tutors who support them. The explanations use clear global English and SI units.

Do the calculators show working steps?

Yes — every calculator displays the formula it used and the substitution step by step, so you can follow the method and check your own work.

Can I rely on Periodixy for exam preparation?

Periodixy is an educational aid: use it to learn methods, check homework, and drill with quizzes and flashcards. For graded or lab-critical work, always verify against your course materials.

How accurate is the element data?

Element values come from a structured scientific dataset and are suitable for schoolwork. Where a value is unknown or varies between sources, we display “Not available” rather than guessing. Corrections are welcome via the contact page.