Physics Calculators
Instant, accurate physics calculations with step-by-step explanations. Built for students, educators, and curious minds — free forever.
Featured Calculators
The tools our readers use most — complete with formulas and worked examples.
Kinematic Calculator
Solve any linear motion problem — find velocity, displacement, acceleration, or time from SUVAT equations. Ideal for projectile and free-fall problems.
Open Calculator →Ohm’s Law Calculator
Enter any two of voltage (V), current (I), or resistance (R) — instantly finds the third. Also calculates power dissipation. Perfect for circuit design.
Open Calculator →All Calculators
Growing library — more tools added every month based on reader requests.
Kinematic Calculator
Solve SUVAT equations for linear motion. Find any unknown when given three values — covers velocity, displacement, acceleration, and time.
Ohm’s Law Calculator
Enter any two of voltage, current, or resistance — solves for the third instantly. Also calculates all four power formulas.
Wave Calculator
Calculate wave speed, frequency, wavelength, and period. Includes speed of light and sound presets for electromagnetic and mechanical waves.
Newton’s Second Law Calculator
Calculate force, mass, or acceleration instantly using Newton’s Second Law of Motion. Ideal for mechanics and motion problems.
Projectile Motion Calculator
Find range, max height, time of flight, and trajectory of any projectile. Enter launch angle, speed, and height to see the full path.
Kinetic Energy Calculator
Calculate the kinetic energy, mass, or velocity of a moving object instantly. Simple plug-and-solve tool for any motion problem.
Free Fall Calculator
Find the velocity, height, or time for an object falling under gravity alone. Ideal for basic kinematics and gravity problems.
Pendulum Period Calculator
Calculate the period, length, or frequency of a simple pendulum. Useful for oscillation and timing experiments.
Ideal Gas Law Calculator
Solve for pressure, volume, moles, or temperature of a gas using the ideal gas equation. Great for chemistry and thermodynamics.
Gravitational PE Calculator
Find the gravitational potential energy of an object based on its mass, height, and gravity. Quick and accurate results.
Momentum Calculator
Calculate the momentum, mass, or velocity of an object in motion. Also supports basic collision and impulse problems.
Circular Motion Calculator
Find centripetal force, acceleration, or speed for any object moving in a circular path. Covers radius and angular velocity too.
Hooke’s Law Calculator
Calculate spring force, displacement, or spring constant instantly. Perfect for elasticity and spring-mass problems.
Doppler Effect Calculator
Find the observed frequency of sound or light as a source moves toward or away from an observer. Covers approaching and receding cases.
Snell’s Law Calculator
Calculate the angle of refraction or refractive index when light passes between two media. Essential for optics problems.
Torque Calculator
Find the torque, force, or lever arm length for any rotating system. Useful for mechanics and engineering problems.
Buoyancy Calculator
Calculate the buoyant force on an object submerged in a fluid using Archimedes’ principle. Find density or volume too.
Work & Power Calculator
Find work done, power, force, or time for any task. Covers both mechanical work and power output calculations.
Escape Velocity Calculator
Calculate the minimum speed needed to escape a planet’s or star’s gravity. Enter mass and radius to find escape velocity instantly.
Thermal Expansion Calculator
Find the change in length, area, or volume of a material as temperature changes. Covers linear and volumetric expansion.
Coulomb’s Law Calculator
Calculate the electrostatic force between two charges based on their magnitude and distance apart. Solve for charge or distance too.
Simple Harmonic Motion Calculator
Find displacement, velocity, acceleration, and period for any object undergoing simple harmonic motion. Covers springs and pendulums.
Lens & Mirror Calculator
Calculate image distance, object distance, or focal length for lenses and mirrors. Find magnification for any optical setup.
Radioactive Decay Calculator
Find the remaining quantity, half-life, or decay rate of a radioactive substance over time. Useful for nuclear physics problems.
Fluid Pressure Calculator
Calculate the pressure exerted by a fluid at any depth using density, gravity, and depth. Great for hydrostatics problems.
Friction Force Calculator
Find the friction force, normal force, or coefficient of friction between two surfaces. Covers static and kinetic friction.
Universal Gravitation Calculator
Calculate the gravitational force between two masses using Newton’s law of universal gravitation. Solve for mass or distance too.
Resistors Series/Parallel Calculator
Find the total resistance for resistors connected in series or parallel. Add as many resistors as you need and get instant results.
Specific Heat Calculator
Calculate the heat energy, mass, or temperature change of a substance using its specific heat capacity. Ideal for thermal problems.
Electric Field Calculator
Find the electric field strength created by a point charge at any distance. Also calculates force on a test charge.
Capacitor Calculator
Calculate capacitance, charge, or voltage for a capacitor, plus stored energy. Covers series and parallel combinations too.
Bernoulli’s Equation Calculator
Find pressure, velocity, or height at any two points in a flowing fluid using Bernoulli’s principle. Useful for fluid dynamics.
Power Calculator
Calculate electrical or mechanical power using voltage, current, force, or work done. One simple tool for any power problem.
Physics Unit Converter
Convert between common physics units instantly — length, mass, force, energy, pressure, and more. One tool for every conversion.
- v = u + atFinal velocity — SUVAT (Kinematics)
- V = IROhm’s Law — Voltage, Current, Resistance
- v = fλWave speed = frequency × wavelength
- F = maNewton’s Second Law of Motion
- E = mc²Mass-energy equivalence (Einstein)
- P = VIElectrical power dissipation
💡 How to Use
- Enter known values in the input fields
- Select the correct units from the dropdown
- Click Calculate — results show instantly
- Read the step-by-step solution below
- Reset for a new problem anytime
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Request a Tool →Want to understand the theory behind these formulas?
Our in-depth articles explain every equation — with diagrams, proofs, and real-world examples.