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 for 108 elements from NIH PubChem
  • Detailed element pages with atomic properties
  • Search by name, symbol, or atomic number

Calculator Tools

Step-by-step chemistry calculators — see 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 for any chemical 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.

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Structured Learning

Step-by-step problem solving across all of General Chemistry, with detailed explanations.

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Practice Problems

Interactive worksheets with instant feedback. Practice stoichiometry, balancing equations, and more.

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Equation Balancer

Balance chemical equations with step-by-step guidance. Learn the process, not just the answer.

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AI Chemistry Tutor

Get help from an AI that actually understands chemistry. Fine-tuned on proven teaching methodology.

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