Chemistry Tools

Free calculators and tools to help you learn and practice chemistry, with step-by-step solutions.

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Interactive Periodic Table

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Explore all 118 elements with detailed properties, isotope data, and periodic trends.

  • 6 color modes (element type, electronegativity, density, phase, block, period)
  • Isotope data and applications with NIH PubChem and IUPAC references
  • Detailed element pages with atomic properties
  • Search by name, symbol, or atomic number

Calculator Tools

Step-by-step chemistry calculators that show the worked solution, not just the answer.

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Significant Figures

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Count sig figs with digit-by-digit highlighting, round to N significant figures, and do arithmetic with proper sig fig rules.

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Unit Converter

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Convert between chemistry units: temperature (K/°C/°F), pressure (atm/Pa/mmHg), mass, volume, energy, and amount of substance.

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Molar Mass Calculator

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Calculate molar mass from a neutral formula. Enter H₂SO₄, Ca(OH)₂, or CuSO₄·5H₂O and get the molecular weight with element breakdown.

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Concentration Calculator

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Calculate molarity from mass and volume, solve C₁V₁=C₂V₂ dilution problems, and find mass percent composition.

Beyond the Calculators

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Structured Learning

Step-by-step lessons and worked examples across all of general chemistry, with detailed explanations.

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Graded Practice

1,600+ practice problems with instant grading, complete worked solutions, and your attempt history saved.

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Reference Library

22 sortable data tables, including interactive solubility, titration, and phase diagrams, each citing its source.

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These calculators are free. Create a free account to browse the full curriculum; a subscription unlocks graded practice.

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