Free Online Physics Calculators

Physics is one of those subjects where the equations look terrifying on paper but start making perfect sense the moment you see the numbers fall into place. Our physics calculators cover the full spectrum — classical mechanics and thermodynamics, electromagnetism, optics, quantum physics, fluid dynamics, and special relativity. Need to calculate centripetal force, find the de Broglie wavelength of a particle, or work out the Carnot efficiency of a heat engine? We've built tools for all of it. Whether you're a high school student surviving a kinematics exam, an engineering student wrestling with Bernoulli's equation, or just someone curious about what happens to time at near-light speeds — these calculators give you real answers based on real physics. No hand-waving, no unexplained approximations, just the formula, your inputs, and a result you can use. From everyday electrical work (Ohm's law, wire sizing, circuit resonance) to the exotic (Hawking radiation, Alfvén velocity, Compton scattering), every tool is free, fast, and built to make the universe's rulebook a little less intimidating.