UsePhysics: Physics Calculator

30 physics calculators that show the formula and the working, not just the answer — and every one of them runs offline, in airplane mode. No account, no ads. Most calculator apps hand you a number and stop. UsePhysics gives you the number, the physics formula it came from, what the result actually means, and where it turns up in the world outside the exam hall. Newton's second law is also why crumple zones work. Terminal velocity is also why a cat survives a fall a person would not. WHAT'S INSIDE: 30 PHYSICS CALCULATORS • Mechanics and kinematics — Newton's second law (F = ma), acceleration, momentum, projectile motion, free fall, torque, tension, Atwood machines, impact force, terminal velocity • Energy — kinetic energy, potential energy, work, power, watts and joules • Electricity and waves — Ohm's law, wavelength, watts to amps • Thermodynamics and fluids — ideal gas law, specific heat, thermal expansion, density, pressure • Optics — Snell's law, the lens equation • Everyday life — the cost of running an appliance, and what your electricity bill is really measuring Need a projectile motion calculator for homework, an Ohm's law calculator for a circuit, or a kinetic energy calculator to check a lab result? Browse by topic, with each calculator listed next to its formula, or search by name, formula or category. THE FORMULA AND THE WORKING, EVERY TIME • Each calculator shows the physics formula it uses — F = m × a, KE = ½ × m × v², p = m × v — on the same screen as your result. • A plain-language explanation says what the number means and where it shows up in real life. • Every calculator states its assumptions. Several ignore air resistance or assume ideal conditions, and they say so, because a number without its assumptions is an opinion in disguise. BUILT FOR A PHONE, NOT COPIED FROM A WEBSITE • Fully offline. All 30 calculators, every explanation and every worked example are bundled into the app. There is no network request anywhere in it, so it works on a train, in a lab or in airplane mode. • Picks up where you left off. The app remembers the calculators you used and puts the last one a single tap from opening. • Unit presets that stick. Choose SI or SI plus US/Imperial once, and every result carries a second reading in the units you think in — feet, pounds, mph, psi, BTU, degrees Fahrenheit. WHO IT IS FOR High school and first-year university physics students checking homework and lab work, and anyone curious about the physics of everyday life. Formulas use standard SI notation. NO ACCOUNT, NO ADS, NO TRACKING There is no sign-up, no advertising, no in-app purchase, no analytics SDK and no data collection of any kind. Your recent calculators and your unit choice live in the app's own storage on your device and are erased when you uninstall it. HONEST ABOUT ITS LIMITS These figures are for education and estimation — information, not engineering or safety advice. The same 30 physics calculators are on usephysics.com. Built by JukkaBlomberg.com — one founder, an AI-native team, on Portfolio OS. More apps at jukkablomberg.com/apps.