DrPhos' Significant Figures

Master significant figures with ease — and unlock powerful chemistry tools as you go. Start free with the Sig Fig Counter — a simple, accurate way to evaluate significant figures for chemistry, physics, and lab work. Built by a chemistry professor for real classroom use. Unlock additional tools when you’re ready: • Molar Mass Calculator — Instantly calculate molecular weights • Stoichiometry Solver — Automate moles, mass, and volume calculations • Reaction Balancer — Balance chemical equations with one tap • pH and Kinetics Calculators — For acids, bases, and rate laws • Ionic Compound Builder — Name compounds and build formulas • General Naming Helper — Recognize covalent, binary, and ionic rules • Quadratic Solver — Handy for kinetics and physical chemistry Whether you’re a student, tutor, or instructor, this app is designed to make chemistry faster, cleaner, and more accurate — with no ads and no clutter. Used by students, built by a professor.