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.