Physics Calculators
Free physics tools for every need. All calculations happen in your browser. No signup, no tracking.
Angular Momentum Calculator: Spin Momentum Solver
Calculate angular momentum for rotating systems from moment of inertia and angular velocity. Enter both values for instant results. Free, no signup.
Centripetal Force Calculator: Circular Motion Solver
Calculate centripetal force for circular motion: Fc = mv²/r. Enter mass, velocity, and radius for instant results. Free, no signup.
Coulomb's Law Calculator: Electrostatic Force Solver
Calculate the electrostatic force between two point charges with Coulomb's law. Supports micro, nano, and picocoulomb units. Free.
Density Calculator - Solve Mass, Volume, or Density
Calculate density, mass, or volume with ρ = m/V. Includes a reference table of common material densities from air to gold.
Doppler Effect Calculator: Observed Frequency Shift
Calculate the observed frequency when the source, observer, or both are moving. Explains redshift vs blueshift with sound and light presets.
Escape Velocity Calculator: Speed to Leave a Planet
Calculate escape velocity for any planet, moon, or custom body with v = sqrt(2GM/R). Includes presets for all eight planets, the Moon, and the Sun.
Free Fall Calculator: Drop Time and Impact Velocity
Calculate free fall time and final velocity from drop height. Enter height to see fall time and impact speed instantly. Free, no signup.
Frequency and Wavelength Calculator: Wave Solver
Solve the wave equation v = fλ for frequency, wavelength, or wave speed, including period. Covers the full EM spectrum with band labels.
Gravitational Force Calculator: Newton's Law Solver
Calculate the gravitational attraction between any two masses with F = Gm₁m₂/r². Includes presets for Earth, Moon, Sun, and planets.
Half-Life Calculator: Radioactive Decay Solver
Calculate remaining quantity, elapsed time, or half-life for radioactive decay with N = N₀(1/2)^(t/t½). Includes isotope presets.
Kinematics Calculator: Solve SUVAT Motion Equations
Solve kinematic SUVAT equations for velocity, acceleration, time, or distance. Enter any three variables for instant results. Free, no signup.
Kinetic Energy Calculator: KE from Mass and Speed
Calculate kinetic energy from mass and velocity: KE = ½mv². Enter mass and speed for instant energy results. Free, no signup.
Magnetic Force Calculator: F = qvB on Moving Charges
Calculate magnetic force F = qvB on a charged particle in a magnetic field. Enter charge, velocity, and field strength. Free, no signup.
Moment of Inertia Calculator: Disks, Spheres, Rods
Calculate moment of inertia for common shapes: solid disk, hollow cylinder, sphere, rod, and plate. Essential for rotational dynamics. Free.
Moment of Inertia of a Disk: I = ½mr² Calculator
Calculate moment of inertia I = ½mr² for a solid disk or cylinder. Enter mass and radius for instant results. Free, no signup.
Moment of Inertia of a Rod: I = mL²/12 Calculator
Calculate moment of inertia I = mL²/12 for a thin rod rotating about its center. Enter mass and length. Free, no signup.
Momentum Calculator - Solve p = mv for Any Variable
Calculate momentum, mass, or velocity with p = mv. Full metric and imperial unit support, plus a kinetic energy bonus readout. Free.
Newton's Second Law Calculator - Solve F = ma
Solve F = ma for force, mass, or acceleration with metric and imperial unit conversion. Includes weight and g-force readouts.
Ohm's Law Calculator: Voltage, Current, Resistance
Solve Ohm's law V = IR for voltage, current, or resistance. Enter any two values, plus power calculation. Free, no signup.
Parallel Plate Capacitor Calculator: C = εA/d
Calculate the capacitance of a parallel plate capacitor from plate area and separation. Enter values for instant results. Free, no signup.
Parallel Resistor Calculator: Total Resistance
Calculate total resistance of resistors in parallel with 1/Rt = 1/R1 + 1/R2. Enter values for instant results. Free, no signup.
Photoelectric Effect Calculator: Photon Energy
Calculate photon energy, electron kinetic energy, or threshold frequency with E = hf − φ. Includes work functions for common metals.
Potential Energy Calculator: PE = mgh Solver
Calculate gravitational potential energy PE = mgh from mass, gravity, and height. Enter values for instant results. Free, no signup.
Power Calculator: Watts, Horsepower and Electrical
Calculate power from work/time, force/velocity, or voltage/current. Converts watts, horsepower, and BTU/hr with any-variable solving.
Pressure Calculator - Force Over Area (P = F/A)
Calculate pressure from force and area with P = F/A. Converts Pa, psi, atm, bar, mmHg, and more units. Free, instant results.
Projectile Motion Calculator: Range, Height and Time
Calculate projectile range, maximum height, and time of flight from initial velocity and launch angle. Instant results. Free, no signup.
Rotational KE Calculator: Energy of Spinning Objects
Calculate rotational kinetic energy for spinning objects: KE = 1/2 x I x omega². Enter moment of inertia and angular velocity. Free, no signup.
Series Resistor Calculator: Total Resistance Solver
Calculate total resistance of resistors in series with Rt = R1 + R2 + ... Enter values for instant results. Free, no signup.
Simple Pendulum Calculator: Period and Frequency
Calculate pendulum period, frequency, or length with T = 2π√(L/g). Adjustable gravity for the Moon, Mars, and other planets.
Snell's Law Calculator: Refraction Angle Solver
Calculate refraction angles or refractive indices with n₁sinθ₁ = n₂sinθ₂. Built-in index table for glass, water, diamond, and air.
Sound Decibel Calculator: dB from Intensity
Calculate sound intensity level in decibels: dB = 10·log(I/I0). Enter the intensity ratio for instant results. Free, no signup.
Specific Heat Capacity Calculator - Solve Q = mcΔT
Calculate heat energy, mass, specific heat, or temperature change with Q = mcΔT. Includes a table of specific heats for common substances.
Spring Force Calculator: Hooke's Law F = -kx
Calculate spring force F = -kx with Hooke's law. Enter spring constant and displacement for instant results. Free, no signup.
Torque Calculator: Twist Force in Newton-Meters
Calculate torque from force, lever arm, and angle: T = F x r x sin(angle). Enter values for instant newton-meter results. Free, no signup.
Wave Speed Calculator: Frequency to Wavelength
Calculate wave speed from frequency and wavelength: v = f x wavelength. Enter any two values for instant results. Free, no signup.
Work Calculator: Force Times Distance Solver
Calculate work done by a force: W = F x d x cos(angle). Enter force, distance, and angle for instant results. Free, no signup.