Physics Calculators

98 free physics calculators for mechanics, thermodynamics, optics, electricity, waves, and relativity. No signup required.

98 free tools

Acceleration Calculator

Calculate acceleration from velocity change over time or from force and mass. Supports both a=(v-u)/t and a=F/m formulas. Free, instant results.

555 Timer Calculator

Calculate 555 timer astable mode frequency, period, and duty cycle from R1, R2, and capacitance values. Free, instant results.

Force Calculator

Calculate force using Newton's second law F=ma. Enter mass and acceleration to find the net force in Newtons. Free, instant results.

Momentum Calculator

Calculate momentum using p=mv. Enter mass in kg and velocity in m/s. Free online physics calculator with instant results.

Angular Acceleration Calculator

Calculate angular acceleration from initial and final angular velocities over time. Free online physics tool with instant results.

Velocity Calculator

Calculate velocity using v=d/t or v=u+at. Enter distance and time or initial velocity with acceleration. Free physics calculator.

Angular Momentum Calculator

Calculate angular momentum from moment of inertia and angular velocity. Free physics calculator with instant results.

Angular Velocity Calculator

Calculate angular velocity from angle and time or from frequency. Supports rad/s, RPM, and degrees per second. Free online tool.

Beat Frequency Calculator

Calculate beat frequency from two source frequencies. See the beat period and individual frequencies. Free online physics tool.

Blackbody Radiation Calculator

Calculate peak emission wavelength from temperature using Wien's displacement law. Free online physics calculator.

Boiling Point at Altitude Calculator

Calculate the boiling point of water at any altitude. Shows how atmospheric pressure changes with elevation. Free online tool.

Brewster's Angle Calculator

Calculate Brewster's angle from refractive indices. Find the polarization angle for reflected light. Free online optics tool.

Capacitance Calculator

Calculate capacitance from charge/voltage or from parallel plate dimensions. Includes energy stored. Free online tool.

Capacitors Series/Parallel Calculator

Calculate total capacitance for capacitors in series or parallel. Supports up to 5 capacitors. Free online tool.

Carnot Efficiency Calculator

Calculate the maximum theoretical efficiency of a heat engine using Carnot's theorem. Free online thermodynamics tool.

Centripetal Force Calculator

Calculate centripetal force from mass, velocity, and radius. Free online physics tool with instant results.

Circular Motion Calculator

Calculate velocity, period, frequency, and centripetal acceleration for uniform circular motion. Free online physics tool.

Conservation of Momentum Calculator

Solve collision problems using conservation of momentum. Find unknown velocities for two-body collisions. Free physics tool.

Coulomb's Law Calculator

Calculate electrostatic force between two charges using Coulomb's law. Free online physics calculator with instant results.

Damping Ratio Calculator

Calculate the damping ratio of a system from damping coefficient, mass, and stiffness. Free online physics tool.

Decibel Calculator

Convert between decibels and power or voltage ratios. Free online acoustics and electronics tool.

Diffraction Grating Calculator

Calculate diffraction angles and maximum orders for a diffraction grating. Free online optics tool.

Diopter Calculator

Convert focal length to diopters (optical power) for lenses. Free online optics and vision tool.

Displacement (SUVAT) Calculator

Solve SUVAT equations for displacement, velocity, acceleration, and time. Enter any 3 known values. Free physics tool.

Doppler Effect Calculator

Calculate the observed frequency when a sound source or observer is moving. Free online physics tool.

Elastic Potential Energy Calculator

Calculate the elastic potential energy stored in a spring from spring constant and displacement. Free online physics tool.

Electric Field Calculator

Calculate the electric field from a point charge or from force on a test charge. Free online physics tool.

Electrical Power Calculator

Calculate electrical power, voltage, current, and resistance using P=IV, P=I2R, and P=V2/R. Free online tool.

Entropy Calculator

Calculate entropy change from heat transfer and temperature. Free online thermodynamics tool with instant results.

Faraday's Law Calculator

Calculate induced EMF from changing magnetic flux and number of turns. Free online electromagnetic induction tool.

Free Fall Calculator

Calculate fall time, final velocity, and distance for objects in free fall. Ignores air resistance. Free online physics tool.

Frequency Wavelength Calculator

Convert between frequency, wavelength, and wave velocity. Solve for any one variable from the other two. Free online tool.

Friction Force Calculator

Calculate friction force from the coefficient of friction and normal force. Free online physics tool with instant results.

Gibbs Free Energy Calculator

Calculate Gibbs free energy from enthalpy, entropy, and temperature. Determine reaction spontaneity. Free online tool.

Gravitational Force Calculator

Calculate the gravitational force between two masses using Newton's law of universal gravitation. Free online physics tool.

Heat Transfer Calculator

Calculate heat transfer rate through a material using Fourier's law of conduction. Free online thermodynamics tool.

Helmholtz Resonator Calculator

Calculate the resonant frequency of a Helmholtz resonator from cavity and neck dimensions. Free online acoustics tool.

RC High/Low Pass Filter Calculator

Calculate the cutoff frequency and time constant for RC high-pass and low-pass filters. Free online electronics tool.

Hooke's Law Calculator

Calculate spring force and potential energy from spring constant and displacement. Free online physics tool.

Ideal Gas Law Calculator

Solve the ideal gas law PV = nRT for any variable. Supports multiple units. Free online chemistry and physics tool.

Impact Force Calculator

Calculate the average impact force from mass, velocity, and collision time. Free online physics tool.

Impulse Calculator

Calculate impulse from force and time or from mass and velocity change. Free online physics tool.

Inclined Plane Calculator

Calculate forces on an object on an inclined plane, including parallel, normal, and friction components. Free physics tool.

Index of Refraction Calculator

Calculate the index of refraction from the speed of light in a medium. Free online optics tool.

Inductors Series/Parallel Calculator

Calculate total inductance for inductors in series or parallel. Supports up to 5 inductors. Free online tool.

Kinetic Energy Calculator

Calculate kinetic energy from mass and velocity using KE = 0.5mv2. Free online physics calculator.

LED Resistor Calculator

Calculate the resistor needed for an LED circuit from supply voltage, LED forward voltage, and current. Free online tool.

Lensmaker's Equation Calculator

Calculate focal length and optical power from lens curvature and refractive index. Free online optics tool.

Lorentz Force Calculator

Calculate the magnetic force on a moving charge in a magnetic field. Free online physics tool.

Mach Number Calculator

Calculate the Mach number from object speed and speed of sound. Identify flow regime. Free online aerospace tool.

Magnetic Field (Wire) Calculator

Calculate the magnetic field around a straight current-carrying wire using the Biot-Savart law. Free online physics tool.

Mirror Equation Calculator

Calculate image distance and magnification for concave and convex mirrors. Free online optics tool.

Moment of Inertia Calculator

Calculate the moment of inertia for common shapes: solid/hollow sphere, cylinder, rod, and disk. Free online physics tool.

Natural Frequency Calculator

Calculate the natural frequency and period of a mass-spring system. Free online physics tool.

Newton's Second Law Calculator

Calculate force, mass, or acceleration using F = ma. Solve for any variable. Free online physics tool.

Ohm's Law Calculator

Calculate voltage, current, resistance, and power using Ohm's law V=IR. Enter any two values. Free online tool.

Parallel Resistors Calculator

Calculate total resistance for resistors in parallel. Supports up to 5 resistors. Free online electronics tool.

Potential Energy Calculator

Calculate gravitational potential energy from mass, height, and gravity. Free online physics tool.

Power Factor Calculator

Calculate power factor, real power, reactive power, and apparent power from voltage, current, and phase angle. Free online tool.

Projectile Motion Calculator

Calculate range, maximum height, and flight time for projectile motion. Free online physics tool.

RC Circuit Calculator

Calculate the time constant, charging and discharging voltages for an RC circuit. Free online electronics tool.

Resistor Color Code Calculator

Decode 4-band and 5-band resistor color codes to find resistance and tolerance. Free online electronics tool.

Resonant Frequency (Tube) Calculator

Calculate the resonant frequencies of open and closed tubes for various harmonics. Free online acoustics tool.

Reverberation Time Calculator

Calculate reverberation time (RT60) using the Sabine equation from room volume and absorption. Free online acoustics tool.

RLC Circuit Calculator

Calculate impedance, current, phase angle, and resonant frequency for an RLC series circuit. Free online electronics tool.

Rotational Kinetic Energy Calculator

Calculate rotational kinetic energy from moment of inertia and angular velocity. Free online physics tool.

Series Resistors Calculator

Calculate total resistance for resistors in series. Supports up to 5 resistors. Free online electronics tool.

Simple Harmonic Motion Calculator

Calculate position, velocity, and acceleration for simple harmonic motion at any time. Free online physics tool.

Simple Pendulum Calculator

Calculate the period and frequency of a simple pendulum from its length. Free online physics tool.

Snell's Law Calculator

Calculate the refraction angle when light passes between media using Snell's law. Detect total internal reflection. Free optics tool.

Solenoid Magnetic Field Calculator

Calculate the magnetic field inside a solenoid from current and turns per length. Free online physics tool.

Specific Heat Calculator

Calculate heat energy, mass, specific heat capacity, or temperature change using Q = mc delta T. Free online tool.

Speed of Sound Calculator

Calculate the speed of sound in air at any temperature. Shows results in m/s, km/h, mph, and ft/s. Free online tool.

Stefan-Boltzmann Law Calculator

Calculate the radiant power emitted by an object using the Stefan-Boltzmann law. Free online physics tool.

Stopping Distance Calculator

Calculate the stopping distance of a vehicle from speed and friction coefficient. Free online physics tool.

Telescope Magnification Calculator

Calculate the magnification and field of view of a telescope from objective and eyepiece focal lengths. Free online optics tool.

Terminal Velocity Calculator

Calculate the terminal velocity of a falling object from mass, drag coefficient, area, and air density. Free online tool.

Thermal Conductivity Calculator

Solve Fourier's law for thermal conductivity, heat rate, area, temperature difference, or thickness. Free online tool.

Thermal Expansion Calculator

Calculate the change in length, area, or volume due to temperature change. Free online physics and engineering tool.

Thin Lens Calculator

Solve the thin lens equation for focal length, object distance, or image distance. Find magnification. Free optics tool.

Three-Phase Power Calculator

Calculate real, reactive, and apparent power for three-phase systems from line voltage, current, and power factor. Free online tool.

E=mc2 Calculator

Mass-energy equivalence.

Time Dilation Calculator

t' = t/sqrt(1 - v2/c2).

Torque Calculator

Calculate torque from force, radius, and angle using tau = rF sin(theta). Free online physics tool.

Escape Velocity Calculator

v = sqrt(2GM/r).

Schwarzschild Radius Calculator

r_s = 2GM/c2.

Voltage Divider Calculator

Calculate the output voltage of a voltage divider circuit from two resistors and input voltage. Free online tool.

Orbital Velocity Calculator

Circular orbital speed.

Voltage Drop Calculator

Calculate voltage drop across a wire from current, resistance, and length. Free online electrical tool.

Orbital Period Calculator

Kepler's third law.

Wavelength Calculator

Calculate wavelength from frequency and wave velocity. Shows period and other wave properties. Free online physics tool.

Relativistic Kinetic Energy Calculator

KE with relativistic correction.

Wheatstone Bridge Calculator

Calculate the unknown resistance in a balanced Wheatstone bridge from three known resistances. Free online electronics tool.

Length Contraction Calculator

L = L0*sqrt(1 - v2/c2).

Wire Resistance Calculator

Calculate the resistance of a wire from its resistivity, length, and cross-sectional area. Free online tool.

Drake Equation Calculator

Estimated intelligent civilizations.

Work Calculator

Calculate mechanical work from force, distance, and angle using W = Fd cos(theta). Free online physics tool.

Half-Life Calculator

Radioactive decay and half-life.