Physics Tools

Free physics calculators that run entirely in your browser — kinematics (SUVAT), thin lens and mirror, elastic and inelastic collisions, pendulum period, centripetal force, Doppler effect, Hooke's law, terminal velocity, buoyancy, friction, hydrostatic pressure, Reynolds number and more. No sign-up, nothing uploaded.

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Kinematics / SUVAT Calculator

Solve constant-acceleration motion: enter any three of displacement, velocity, acceleration and time to get the rest.

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Thin Lens & Mirror Equation Calculator

Solve the thin lens or mirror equation for focal length, object or image distance, plus magnification and image type.

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Collision Calculator (1D)

Solve one-dimensional collisions: elastic, perfectly inelastic or custom restitution, with final velocities and kinetic energy.

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Simple Pendulum Period Calculator

Find a simple pendulum's period, length or gravity from T = 2π√(L/g), with frequency and gravity presets.

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Centripetal Force & Acceleration Calculator

Compute centripetal force and acceleration for circular motion from mass, radius and speed, period or angular velocity.

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Doppler Effect Calculator

Calculate the observed frequency, shift and wavelength from source and observer speeds using the Doppler effect.

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Hooke's Law & Spring Calculator

Solve Hooke's law F = kx for force, spring constant or displacement, with elastic energy and series/parallel springs.

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Terminal Velocity Calculator

Compute terminal velocity from mass, drag coefficient, area and fluid density using v = √(2mg/ρACd), with presets.

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Buoyancy Force Calculator

Calculate the buoyant force on a submerged object with Archimedes' principle, plus float/sink and fraction submerged.

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Friction Force Calculator

Find friction force from mass and coefficient on a flat surface or an inclined plane, with normal force and slide check.

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Hydrostatic Pressure & Pascal Calculator

Compute fluid pressure at depth (gauge and absolute, in Pa/kPa/psi) or hydraulic force multiplication via Pascal's law.

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Centrifuge RPM ⇄ G-Force / RCF Calculator

Convert between centrifuge RPM and relative centrifugal force (RCF, ×g) from the rotor radius, both directions.

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Speed of Sound Calculator

Calculate the speed of sound in air at any temperature (or in water and steel), in m/s, ft/s, mph and km/h.

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Reynolds Number Calculator

Compute the Reynolds number from density, velocity, length and viscosity, and classify laminar, transitional or turbulent flow.

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Inclined Plane Calculator

Find acceleration down a ramp plus the parallel, normal and friction forces and the ramp's mechanical advantage.

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Angular Velocity & RPM Calculator

Convert between angular velocity, RPM, frequency and period, and get tangential speed and centripetal acceleration.

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