About EmpiricalFormulas.com
EmpiricalFormulas.com is a free, open-access chemistry tool designed to help students, educators, and researchers calculate empirical and molecular formulas with complete step-by-step solutions.
Our Mission
We believe every chemistry student deserves access to high-quality, distraction-free tools. Our mission is simple: provide the best empirical formula calculator on the web — no ads, no paywalls, no distractions.
Whether you're working through a pre-lab assignment, preparing for an AP Chemistry exam, or verifying results during research, our calculator gives you accurate results with the complete mathematical work shown at every step.
What We Offer
- Empirical Formula Calculator — from percent composition or gram measurements
- Molecular Formula Calculator — using molar mass and empirical formula
- Combustion Analysis Solver — for organic compound analysis
- Step-by-Step Work — full mathematical breakdown for every calculation
- Print-Ready Lab Worksheets — formatted for direct submission
Our Standards
Every calculation on EmpiricalFormulas.com is powered byIUPAC 2026 standard atomic weights published by the Commission on Isotopic Abundances and Atomic Weights (CIAAW). Formulas follow the Hill System ordering convention — carbon first, hydrogen second, then remaining elements in alphabetical order.
Built for Speed & Privacy
All calculations run 100% client-side in your browser. Nothing is sent to a server. This means:
- Zero latency — instant results
- Complete privacy — your data never leaves your device
- Works offline — once loaded, no internet connection required
- No cookies or tracking of any kind
Who We Are
EmpiricalFormulas.com is built and maintained by a small team passionate about chemistry education and web technology. We're committed to keeping this tool free, fast, and useful for everyone.
Get in Touch
Have feedback, feature requests, or found a bug? We'd love to hear from you. Visit our Contact Us page.