Physics Calculators & Tools
Mechanics, Electromagnetism, Thermodynamics, Optics, and Quantum Physics.
Physics problems usually come down to picking the right formula and keeping your units straight. These calculators handle the arithmetic so you can focus on understanding the concept, and each one names the law or equation it applies.
AC to DC Converter Calculator
Convert AC voltage to DC voltage for different rectifier configurations. Free online calculator with instant, step-by-step results.
Acceleration Calculator
Calculate acceleration from velocity change and time.
Amount of Substance Calculator
Calculate number of moles from mass and molar mass.
Angular Acceleration Calculator
Calculate angular acceleration from change in angular velocity.
Antenna Gain Calculator
Calculate antenna gain in dBi from directivity and efficiency.
Average Velocity Calculator
Calculate average velocity from displacement and time.
Battery Charge Time Calculator
Calculate the time to charge a battery.
Bernoulli Equation Calculator
Calculate pressure or velocity using Bernoulli's equation for fluid flow. Free calculator with instant results and a worked example.
Bernoulli Numbers Calculator
Bernoulli Numbers Calculator. Compute Bernoulli numbers B(n) for fluid mechanics and mathematical series.
Brake Horsepower Calculator
Calculate brake horsepower for pumps and engines.
Broad Crested Weir Calculator
Calculate flow rate over a broad-crested weir.
Buoyancy Force Calculator
Calculate the buoyant force on an object submerged in a fluid using Archimedes' principle. Free, accurate results with step-by-step explanations.
Capacitance Calculator
Calculate capacitance, charge, or voltage for a capacitor using Q = CV.
Capacitive Reactance Calculator
Calculate capacitive reactance in AC circuits.
Carnot Efficiency Calculator
Calculate the maximum theoretical efficiency of a heat engine.
Centrifugal Force Calculator
Calculate centrifugal force in rotating reference frames.
Centripetal Acceleration Calculator
Calculate centripetal acceleration for circular motion.
Centripetal Force Calculator
Calculate centripetal force for circular motion.
Circular Velocity Calculator
Calculate the velocity of an object in circular motion.
Coulomb's Law Calculator
Calculate the electrostatic force between two point charges. Free calculator with instant calculations, the underlying formula, and an easy-to-follow example.
Critical Frequency Calculator
Calculate the critical frequency of a signal or resonant circuit.
Cylindrical Tank Volume Calculator
Calculate the volume of a cylindrical tank.
DC Voltage Drop Calculator
Calculate voltage drop in DC electrical circuits based on cable length and current.
De Broglie Wavelength Calculator
Calculate the de Broglie wavelength of a particle.
Decibel Calculator
Calculate sound intensity level in decibels from a power/intensity ratio. dB = 10·log₁₀(I/I₀).
Density Altitude Calculator
Estimate density altitude from pressure altitude and temperature for aviation performance.
Density Calculator
Calculate density from mass and volume.
Differential Pressure Calculator
Calculate differential pressure from fluid column height.
Displacement Calculator
Calculate displacement using initial velocity, acceleration, and time.
Sound Wavelength Calculator
Calculate sound wavelength from speed and frequency.
Drag Force Calculator
Calculate aerodynamic drag force on an object.
Efficiency Calculator
Calculate efficiency as useful output energy divided by total input energy, as a percentage.
Einstein Mass-Energy Calculator
Calculate energy equivalent of mass using E = mc².
Elastic Potential Energy Calculator
Calculate the elastic potential energy stored in a spring.
Electric Field Calculator
Calculate the electric field due to a point charge.
Electric Potential Calculator
Calculate the electric potential due to a point charge.
Electrical Harmonics Calculator
Calculate harmonic frequencies from the fundamental frequency.
Electron Gain/Loss Calculator
Calculate the charge from electrons gained or lost.
Energy Storage Calculator
Calculate energy stored in a capacitor or inductor.
Entropy Change Calculator
Calculate entropy change for heat transfer at constant temperature.
Escape Velocity Calculator
Calculate the escape velocity from a celestial body.
Euler Number Calculator
Calculate the Euler number, dimensionless pressure drop in fluid flow.
Faraday's Law Electrolysis Calculator
Calculate the mass deposited in electrolysis from current, time, molar mass and charge number.
Weight on Other Planets Calculator
Calculate your weight on different planets in the solar system.
Flow Rate Calculator
Flow Rate Calculator. Calculate Q = A × v with step-by-step solutions for fluid mechanics.
Force Calculator
Calculate force from mass and acceleration using Newton's Second Law. Free calculator with instant results and a worked example.
Fourier Number Calculator
Calculate the Fourier number for transient heat conduction analysis.
Free Fall Calculator
Calculate free-fall distance and final velocity from time, ignoring air resistance. d = ½gt².
Frequency Calculator
Calculate frequency from wavelength and wave speed.
Friction Force Calculator
Calculate the force of friction from the coefficient of friction and normal force. F = μN.
Froude Number Calculator
Froude Number Calculator. Compute Fr = v/√(gL) for open channel flow analysis.
Gas Density Calculator
Calculate the density of an ideal gas from pressure, molar mass and temperature. ρ = PM/RT.
Gravitational Potential Energy (Orbital)
Calculate gravitational PE between two masses at distance r.
Heat Flow Calculator
Calculate heat flow using Q = mcΔT.
Heat Transfer Rate Calculator
Calculate the rate of heat transfer through a material.
Heat Energy Calculator
Calculate heat energy from mass, specific heat capacity and temperature change. Q = mcΔT.
Hooke's Law Calculator
Calculate spring force using Hooke's Law. Free calculator with instant calculations, the underlying formula, and an easy-to-follow example.
Horsepower Calculator
Convert between horsepower and watts.
Hydraulic Radius Calculator
Hydraulic Radius Calculator. Compute R = A/P for channel flow with step-by-step solutions.
Hydrostatic Pressure Calculator
Calculate fluid pressure at depth from density, gravity and depth. P = ρgh.
Ideal Gas Law Calculator (Physics)
Calculate pressure, volume, temperature, or amount using PV = nRT.
Ideal Gas Law Calculator
Solve the ideal gas law PV = nRT for pressure, volume, moles or temperature.
Impulse Calculator (with Time)
Calculate impulse from force and time duration.
Impulse Calculator (with Velocity)
Calculate impulse from mass and velocity change.
Inductive Reactance Calculator
Calculate inductive reactance in AC circuits.
Kepler's Third Law Calculator
Calculate orbital period from semi-major axis or vice versa. Free calculator with instant calculations, the underlying formula, and an easy-to-follow example.
Kilovolt-Amps Calculator
Calculate apparent power in kVA.
Kinematic Viscosity Calculator
Calculate kinematic viscosity from dynamic viscosity and density.
Kinetic Energy Calculator
Calculate kinetic energy from mass and velocity.
Kinetic Friction Calculator
Calculate kinetic (sliding) friction force.
Knudsen Number Calculator
Calculate the Knudsen number to determine flow regime (continuum vs molecular).
Newton's Law of Cooling Calculator
Calculate temperature change using Newton's Law of Cooling. Free calculator with instant calculations, the underlying formula, and an easy-to-follow example.
Leaf Spring Calculator
Calculate leaf spring deflection under load.
Lensmaker's Equation Calculator
Calculate focal length using the lensmaker's equation. Free calculator with instant calculations, the underlying formula, and an easy-to-follow example.
Lewis Number Calculator
Calculate the Lewis number, ratio of thermal to mass diffusivity.
Mach Number Calculator
Mach Number Calculator. Determine subsonic, transonic, or supersonic flow with step-by-step solutions.
Solenoid Magnetic Field Calculator
Calculate the magnetic field inside a solenoid.
Magnetic Force Calculator
Calculate the force on a moving charge in a magnetic field.
Mass Flow Rate Calculator
Calculate mass flow rate of a fluid.
Mean Depth Calculator
Calculate mean hydraulic depth of a channel cross-section.
Density, Mass & Volume Calculator
Solve the density relationship ρ = m/V for density, mass or volume.
Moles to Mass Calculator
Convert between moles and mass using molar mass. mass = moles × molar mass.
Moment Calculator
Calculate the moment (torque) of a force about a point.
Moment of Inertia Calculator
Calculate moment of inertia for common shapes.
Momentum Calculator (p = mv)
Calculate linear momentum from mass and velocity. p = m × v. Free physics momentum calculator.
Momentum Change Calculator
Calculate momentum change from force and time.
Momentum Calculator (with Velocity)
Calculate linear momentum from mass and velocity.
Newton Force Calculator
Free online Newton Force Calculator.
Newton's Second Law Calculator
Calculate force, mass, or acceleration using F = ma. Free online calculator with instant results, step-by-step explanations, and a clear worked example.
Newton's Law of Gravity Calculator
Calculate gravitational force between two masses. Use this free calculator for fast, accurate answers, complete with the formula and a worked example.
Nusselt Number Calculator
Calculate the Nusselt number for convective heat transfer analysis.
Ohm's Law Calculator (Current)
Calculate current using Ohm's Law: I = V/R. Get quick, accurate results with this free online calculator, including formulas and worked examples.
Orbital Velocity Calculator
Calculate the orbital velocity for a circular orbit.
Paper Weight Calculator
Calculate paper weight and sheet count from dimensions and GSM.
Parallel Plate Capacitor Calculator
Calculate capacitance of a parallel plate capacitor.
Peclet Number Calculator
Calculate the Peclet number for heat or mass transfer in flowing fluids.
Photoelectric Effect Calculator
Calculate the kinetic energy of photoelectrons.
Physical Pendulum Calculator
Calculate the period of a physical (compound) pendulum.
Potential Energy Calculator
Calculate gravitational potential energy.
Potentiometer Calculator
Calculate output voltage from a potentiometer (variable voltage divider).
Power Calculator (Force × Velocity)
Calculate power from force and velocity.
Power Calculator (Work/Time)
Calculate power from work done and time.
Prandtl Number Calculator
Calculate the Prandtl number, ratio of momentum diffusivity to thermal diffusivity.
Projectile Motion Calculator
Calculate range, max height, and time of flight for projectile motion.
Pump Efficiency Calculator
Pump Efficiency Calculator. Compute η = Pout/Pin with step-by-step solutions.
Radar Range Calculator
Calculate maximum radar detection range.
Rectangular Weir Flow Rate Calculator
Calculate flow rate over a rectangular weir using the Francis formula.
Resultant Force Calculator
Calculate the resultant of two forces acting at an angle.
Reynolds Number Calculator
Reynolds Number Calculator. Determine flow regime (laminar/turbulent) with step-by-step solutions.
Schmidt Number Calculator
Calculate the Schmidt number, ratio of momentum to mass diffusivity.
Schwarzschild Radius Calculator
Calculate the Schwarzschild radius (event horizon) of a black hole.
Sherwood Number Calculator
Calculate the Sherwood number for mass transfer analysis.
Simple Pendulum Calculator
Calculate the period of a simple pendulum.
Snell's Law Calculator
Calculate the angle of refraction using Snell's Law. Free online calculator with instant results, step-by-step explanations, and a clear worked example.
Sound Intensity Level Calculator
Calculate sound intensity level in decibels.
Sound Power Emitted Calculator
Calculate sound power from intensity and area.
Sound Pressure Level Calculator
Calculate sound pressure level in dB from pressure.
Specific Gas Constant Calculator
Calculate the specific gas constant for any gas from the universal gas constant.
Specific Volume Calculator
Specific Volume Calculator. Compute v = V/m or v = 1/ρ with step-by-step solutions.
Speed Calculator
Calculate speed from distance and time, or solve for distance or time. Free physics speed calculator.
Speed of Sound Calculator
Calculate the speed of sound in air at a given temperature.
Static Friction Calculator
Calculate maximum static friction force.
Stefan-Boltzmann Law Calculator
Calculate thermal radiation power using the Stefan-Boltzmann law.
Stokes' Law Calculator
Find the terminal velocity, settling speed, or drag force of a spherical particle moving through a viscous fluid.
Stopping Distance Calculator
Estimate vehicle stopping distance from speed, reaction time and deceleration. Reaction + braking distance.
Rectangular Tank Storage Calculator
Calculate the storage capacity of a rectangular tank.
Strain Calculator
Calculate mechanical strain from change in length.
Stress Calculator
Calculate mechanical stress from force and area.
Stress and Strain Calculator
Calculate stress (force/area), strain (ΔL/L) and Young's modulus for a material under load.
SUVAT Calculator
Solve kinematics problems using SUVAT equations of motion.
Terminal Velocity Calculator
Calculate terminal velocity of a falling object.
Thermal Conductivity Calculator
Calculate thermal conductivity from heat flow data.
Thermal Expansion Calculator
Calculate the change in length of a material from its coefficient of expansion and temperature change.
Thin Lens Equation Calculator
Calculate image distance or focal length using the thin lens equation.
Torque Calculator
Calculate torque from force and moment arm distance.
Torsional Pendulum Calculator
Calculate the period of a torsional pendulum.
Total Work Calculator
Calculate total work done from kinetic energy change (work-energy theorem).
Transverse Strength Calculator
Calculate transverse rupture strength from a bending test.
Velocity Calculator
Calculate velocity using initial velocity, acceleration, and time.
Voltage Divider Calculator
Calculate output voltage of a resistive voltage divider.
Water Horsepower Calculator
Calculate water horsepower, the theoretical minimum power to move water.
Wave Speed Calculator
Calculate wave speed from frequency and wavelength. v = f × λ. Solve for any variable.
Wavelength Calculator
Calculate wavelength from frequency and wave speed.
Weber Number Calculator
Weber Number Calculator. Compute We = ρv²L/σ for droplet and surface tension analysis.
Weight Calculator (W = mg)
Calculate weight (force of gravity) from mass and gravitational acceleration. W = m × g.
Weight Force Calculator
Calculate the weight (gravitational force) of an object.
Wien's Displacement Law Calculator
Calculate peak wavelength of thermal radiation. Free online calculator with instant results, step-by-step explanations, and a clear worked example.
Work Calculator
Calculate work done by a force over a distance.
Young's Modulus Calculator
Calculate Young's modulus (elastic modulus) from stress and strain. Free online calculator with instant, step-by-step results.
How to choose the right Physics tool
- Motion, forces, or energy questions? Start with the mechanics tools.
- Circuits, charge, or fields? Use the electromagnetism calculators.
- Heat, temperature, or gas behavior? The thermodynamics tools fit there.
- Always check that your inputs use consistent units before reading the result.
Who these tools are for
Built for high school and college physics students, lab work, and anyone double-checking a homework or engineering estimate.
Need Help Solving a Problem?
Our AI Math Solver handles any math problem, just type it in plain English and get instant step-by-step solutions.
Explore Other Categories
Popular tools from our other scientific categories
Absolute Value Calculator
Calculate the absolute value of any number. Use this free calculator for fast, accurate answers, complete with the formula and a worked example.
Acid-Base Titration Calculator
Calculate concentration from titration data. Get quick, accurate results with this free online calculator, including formulas and worked examples.
ABV Calculator
Calculate alcohol by volume from original and final gravity. Free calculator with instant calculations, the underlying formula, and an easy-to-follow example.
Amortization Schedule Calculator - Free Online
Free Generate a complete amortization schedule. Step-by-step solutions and formulas included. Free, accurate results with step-by-step explanations.
Average Cost Basis Calculator - Free Online
Free Calculate average cost per share. Step-by-step solutions and formulas included. Fast, accurate, and free, with formula and example.
1031 Exchange Calculator - Free Online
Free Calculate tax deferral in a 1031 exchange. Step-by-step solutions and formulas included. Fast, accurate, and free, with formula and example.
A1C Calculator - Free Online
Free Convert between A1C percentage and estimated average glucose. Step-by-step solutions and formulas included. Simple, fast, and free.
Batting Average Calculator
Calculate batting average in baseball/cricket. Free calculator with instant calculations, the underlying formula, and an easy-to-follow example.
Air Density Calculator
Calculate air density from temperature and pressure using the ideal gas law. Fast, accurate, and free, with formula and example.
Age Calculator
Calculate exact age in years, months, and days. Use this free calculator for fast, accurate answers, complete with the formula and a worked example.
Acceleration Converter
Convert between acceleration units. Get quick, accurate results with this free online converter, including formulas and worked examples.
Circle Area Calculator
Calculate the area and circumference of a circle. Free online calculator with instant results, step-by-step explanations, and a clear worked example.
Angle Between Two Lines Calculator
Calculate the angle between two lines given their slopes. Free calculator with instant calculations, the underlying formula, and an easy-to-follow example.
Apache Log Parser, Free Online Developer Tool
Parse Apache/NGINX combined access log lines into IP, time, request, status and size fields. Get instant results, the formula, and a clear example.
Add Text to Beginning, Free Online Text Tool
Add custom text to the beginning of every line in your text instantly. Get instant results, the formula, and a clear example.
Accessible Color Pair Finder
Check if a text/background pair meets WCAG and suggest a fix. Free tool with instant calculations, the underlying formula, and an easy-to-follow example.
