Physics Formulas - PhysRef

The essential physics reference for students and professionals. Browse 250+ formulas organized by topic, from mechanics to modern physics. WHAT'S INCLUDED Mechanics Kinematics, dynamics, work and energy, momentum, rotational motion, gravitation, and oscillations. Electricity and Magnetism Electrostatics, circuits, magnetism, electromagnetic induction, and AC/DC analysis. Thermodynamics Heat transfer, laws of thermodynamics, kinetic theory, and entropy. Waves and Optics Wave properties, sound, reflection, refraction, lenses, mirrors, interference, and diffraction. Modern Physics Special relativity, quantum mechanics, atomic structure, and nuclear physics. FEATURES Formula Browser Every formula includes a clear equation display, variable definitions with SI units, and a description of when to use it. Built-in Calculators Enter known values and solve for unknowns. Each calculator validates inputs and shows results with appropriate precision. Physical Constants Access fundamental constants including the speed of light, Planck's constant, gravitational constant, electron mass, and more. All values sourced from NIST. Unit Converter Convert between units across 14 categories: length, mass, time, velocity, acceleration, force, energy, power, pressure, temperature, electric charge, voltage, frequency, and angle. Personal Notes Add your own notes to any formula. Notes are saved locally and persist between sessions. Formula Derivations Understand where formulas come from with step-by-step derivations and explanations. Related Formulas Navigate between connected formulas. See which equations are derived from others and how they relate. Search Find formulas by name, variable symbol, or concept. Search history keeps track of your recent queries. Bookmarks Save frequently used formulas for quick access. WHY PHYSREF No ads. The app contains zero advertising. No account required. Start using the app immediately without creating an account or signing in. Works offline. All formulas, constants, and conversions are bundled with the app. No internet connection needed. Privacy focused. Your notes and bookmarks stay on your device. No data is collected or transmitted except for purchase processing. PRICING The free version includes full access to all formulas, descriptions, variables, constants, unit converter, and search. Premium unlocks calculators, personal notes, derivations, and unlimited bookmarks. Lifetime access is available for a one-time purchase. Weekly subscription is also available for flexible access. COVERAGE Content covers high school physics (AP Physics 1, AP Physics 2, IB Physics), introductory college physics, and university-level calculus-based physics courses.