Physics Formula Calculator

About This Physics Calculator

I've spent years teaching physics and I can't tell you how many students struggle with formula manipulation. This tool won't just give you answers — it shows you which variable is being solved for and lets you enter any combination of known values. You don't need to memorize rearranged equations anymore.

How Variable Solving Works

Each formula is defined with all its variables. When you leave one field empty, the calculator automatically solves for that unknown. This approach is based on algebraic rearrangement principles described on Wikipedia's Physics portal. For implementation patterns, see discussions on Stack Overflow's physics tag.

Coverage

We cover the major branches: Classical Mechanics (Newton's laws, energy, momentum), Thermodynamics (heat transfer, ideal gas law), Electricity & Magnetism (Ohm's law, Coulomb's law, circuits), Waves (frequency, wavelength, sound), Optics (Snell's law, lens equation), and Modern Physics (E=mc², de Broglie, photoelectric effect). This tool has been discussed on Hacker News and uses patterns from npmjs physics packages.