Physics
Mechanics, current, waves and heat. Each formula has its own page.
Mechanics
Angular momentum calculator
Angular momentum calculator L = I·ω: I and ω.
Use calculator →Angular Velocity Calculator
Angular Velocity Calculator: period T [s].
Use calculator →Centripetal Acceleration Calculator
Centripetal Acceleration Calculator: v [m/s] and r [m].
Use calculator →Centripetal Force Calculator
Centripetal Force Calculator: m [kg], v [m/s] and r [m].
Use calculator →Force from a change in momentum calculator
Force from a change in momentum calculator: Δp [kg·m/s] and Δt [s].
Use calculator →Free Fall Time Calculator
Free Fall Time Calculator: the height and, if you want, g.
Use calculator →Friction calculator
Friction calculator: μ and mass m.
Use calculator →Gravitational Acceleration Calculator
Gravitational Acceleration Calculator: the mass and the distance from the center.
Use calculator →Gravitational Force Calculator
Gravitational Force Calculator: two masses and the center-to-center distance.
Use calculator →Hooke’s Law Calculator
Hooke’s Law Calculator: stiffness k and extension x.
Use calculator →Inclined plane calculator
Inclined Plane (No Friction) calculator: angle α [°].
Use calculator →Lever equilibrium calculator
Lever equilibrium calculator: exactly three of F₁ [N], r₁ [m], F₂ [N], r₂ [m].
Use calculator →Linear Speed from Angular Velocity calculator
Linear Speed from Angular Velocity calculator: ω [rad/s] and r [m].
Use calculator →Moment of inertia (point mass) calculator
Moment of inertia (point mass) calculator: m [kg] and r [m].
Use calculator →Period of a Simple Pendulum calculator
Period of a Simple Pendulum calculator: This is the school model: a point mass on a massless string, small angle, no drag.
Use calculator →Power from force and velocity
Power from force and velocity P = F·v calculator: force F [N] along the motion and speed v [m/s].
Use calculator →Pressure from force and area
Pressure from force and area: force F [N] and area S [m²].
Use calculator →Projectile Max Height calculator
Projectile Max Height calculator: v₀ and angle.
Use calculator →Projectile Range calculator
Projectile Range calculator: launch speed and angle.
Use calculator →Rotational kinetic energy calculator
Rotational kinetic energy calculator: I [kg·m²] and ω [rad/s], or f [Hz] instead of ω.
Use calculator →Second Cosmic Velocity Calculator
Second Cosmic Velocity Calculator: the mass and the distance from the center.
Use calculator →Spring Oscillation Frequency Calculator
Spring Oscillation Frequency Calculator: the spring constant and the mass.
Use calculator →Uniform Motion Distance Calculator
Uniform Motion Distance Calculator: speed and time.
Use calculator →Uniformly Decelerated Motion calculator
Uniformly Decelerated Motion calculator: v₀ [m/s] and deceleration a [m/s²] as a positive number.
Use calculator →Time from work and power
Time from work and power t = W/P calculator: work W [J] and power P [W].
Use calculator →Electricity
Capacitive reactance calculator
Capacitive reactance calculator Xc = 1/(2πfC): f [Hz] and C [F].
Use calculator →Capacitor stored energy calculator
Same E = ½ C U² as the full page: 1e-6 F at 12 V is 72 µJ, and 1e-4 F at 5 V is 1.25 mJ.
Use calculator →Current from Power and Voltage calculator
Current from Power and Voltage calculator: power P [W] and voltage U [V].
Use calculator →Current Calculator
Current Calculator I = Q/t: charge Q [C] and time t [s].
Use calculator →Electric Charge Calculator
Electric Charge Calculator Q = I·t: current I [A] and time t [s].
Use calculator →Electric Field from Point Charge
Electric Field from Point Charge E = k·Q/r² calculator: Q and r.
Use calculator →Electrical Work Calculator
Electrical Work Calculator W = U·I·t: U [V], I [A] and t [s].
Use calculator →Parallel Capacitance
Parallel Capacitance Cz = C₁+C₂ calculator: C1 [F] and C2 [F].
Use calculator →Series Capacitance 1/Cz
Series Capacitance 1/Cz = 1/C₁+1/C₂ calculator: C1 [F] and C2 [F].
Use calculator →Inductive reactance calculator
Inductive reactance calculator XL = 2πfL: f and L.
Use calculator →Joule Heat Calculator
Joule Heat Calculator Q = I²·R·t: I, R, and t.
Use calculator →Joule Power Loss Calculator
Joule Power Loss Calculator P = I²·R: current I [A] and resistance R [Ω].
Use calculator →Resistance from Ohm's Law calculator
Resistance from Ohm's Law calculator: voltage U [V] and current I [A].
Use calculator →Voltage from Power and Current calculator
Voltage from Power and Current calculator: power P [W] and current I [A].
Use calculator →Transformer secondary turns
Transformer secondary turns n2 = n1·(U2/U1) calculator: U1, U2, and n1.
Use calculator →Work in an electric field
Work in an electric field W = q·U calculator: q [C] and U [V].
Use calculator →Thermodynamics and energy
Latent heat Q = m·L
Two fields, the same formula as the full fusion page.
Use calculator →Latent Heat of Vaporization Calculator
Latent Heat of Vaporization Calculator: mass and the latent heat of vaporization.
Use calculator →Number of moles calculator
Number of moles calculator n = m/M: mass m [g] and molar mass M [g/mol].
Use calculator →Volumetric Expansion Calculator
Volumetric Expansion Calculator: γ, the starting volume, and the temperature rise.
Use calculator →Waves and optics
Frequency from Period Calculator
Frequency from Period Calculator: period T [s].
Use calculator →Photon energy from wavelength
Photon energy from wavelength E = hc/λ calculator: wavelength in meters.
Use calculator →Sound intensity calculator
Intensity-from-level calculator I = I0·10^(L/10): Here the unknown is I, not L.
Use calculator →Wave speed calculator
Wave speed calculator v = λ·f: wavelength and frequency.
Use calculator →Wavelength from photon energy
Wavelength from photon energy λ = hc/E calculator: photon energy in electronvolts.
Use calculator →Other
Acceleration calculator
Acceleration calculator: a speed change and a time.
Use calculator →Average speed calculator
Average speed calculator: the whole distance and the whole time.
Use calculator →Buoyancy calculator
Buoyancy calculator: fluid density ρ [kg/m³] and submerged volume V [m³].
Use calculator →Capacitance calculator
Capacitance calculator: charge Q [C] and voltage U [V].
Use calculator →Capacitor energy calculator
Capacitor energy: C [F] and U [V].
Use calculator →Coulomb Force Calculator
Coulomb Force Calculator F = k·q₁·q₂/r²: q₁ [C], q₂ [C] and r [m].
Use calculator →Density Calculator
Density Calculator: mass and volume.
Use calculator →Doppler effect calculator
Doppler effect calculator: the source frequency and who is moving.
Use calculator →Efficiency Calculator
Efficiency Calculator: output power P_out [W] and input power P_in [W].
Use calculator →Elastic energy calculator
Elastic energy calculator: k and extension x.
Use calculator →Electric Potential Calculator
Electric Potential Calculator V = W/q: work W [J] and charge q [C].
Use calculator →Electromagnetic induction calculator
Electromagnetic induction calculator: the flux change |ΔΦ| [Wb] and the time Δt [s].
Use calculator →Force from engine power
Force from engine power F = P/v calculator: power P [W] and speed v [m/s].
Use calculator →Engine work calculator
Engine work calculator W = P·t: power P [W] and time t [s].
Use calculator →Terminal speed calculator
Terminal speed calculator v = √(2mg/(ρCS)): mass, area and the drag coefficient.
Use calculator →Electric Field Strength Calculator
Electric Field Strength Calculator E = F/q: force F [N] and charge q [C].
Use calculator →First Cosmic Velocity Calculator
First Cosmic Velocity Calculator: the planet mass and the orbit radius.
Use calculator →Force F = m·a calculator
Force F = m·a calculator: mass and acceleration.
Use calculator →Free Fall Calculator
Free Fall Calculator: fall time.
Use calculator →Friction coefficient calculator
Friction coefficient calculator: friction force T [N] and normal force N [N].
Use calculator →Heat Calculator
Heat Calculator Q = c·m·ΔT: specific heat, mass, and how much the temperature changes.
Use calculator →Horizontal Throw calculator
Horizontal Throw calculator: horizontal speed and edge height.
Use calculator →Hydrostatic Pressure Calculator
Hydrostatic Pressure Calculator: density ρ and depth h.
Use calculator →Impulse calculator
Pick a mode: F·Δt or change of momentum.
Use calculator →Kinetic energy calculator
Kinetic energy calculator: mass and speed.
Use calculator →Latent Heat of Fusion Calculator
Latent Heat of Fusion Calculator: mass and the latent heat of fusion.
Use calculator →Thin lens calculator 1/f
Thin lens calculator 1/f = 1/x + 1/y: the object and image distances.
Use calculator →Linear Expansion Calculator
Linear Expansion Calculator: the coefficient α, the starting length, and the temperature rise.
Use calculator →Lorentz force calculator
Lorentz force calculator F = B·I·l: B [T], I [A] and l [m].
Use calculator →Momentum calculator
Momentum calculator: mass m and speed v.
Use calculator →Ohm's Law Calculator
Ohm's Law Calculator: current in amperes and resistance in ohms.
Use calculator →Linear magnification calculator
Linear magnification calculator p = y/x: the image and object distances.
Use calculator →Oscillation Period Calculator
Oscillation Period Calculator: frequency in hertz and you get the time of one cycle.
Use calculator →Pendulum calculator
Pendulum calculator: the string length and, if you want, your own g.
Use calculator →Photon energy calculator
Photon energy calculator E = h·f: frequency.
Use calculator →Potential Energy Calculator
Potential Energy Calculator: mass m [kg] and height h [m].
Use calculator →Power from voltage and current calculator
Power Calculator P = U·I: voltage U [V] and current I [A].
Use calculator →Power from work and time calculator
Power calculator: work W [J] and time t [s].
Use calculator →Pressure
Pressure p = F/S calculator: force F [N] and area S [m²].
Use calculator →Resistors in Parallel Calculator
Resistors in Parallel Calculator: R1 [Ω] and R2 [Ω].
Use calculator →Resistors in Series Calculator
Resistors in Series Calculator: R1 [Ω] and R2 [Ω].
Use calculator →LC resonance calculator
LC resonance calculator f = 1/(2π√(LC)): L [H] and C [F].
Use calculator →Sound level calculator
Sound level calculator L = 10 log(I/I0): intensity I in W/m².
Use calculator →Stefan-Boltzmann law calculator
Stefan-Boltzmann law calculator P = εσAT⁴: area and temperature in kelvin.
Use calculator →Torque calculator
Torque calculator: F [N], r [m] and angle α.
Use calculator →Transformer calculator
Transformer calculator: U1 [V], n1 and n2.
Use calculator →Uniform Motion Calculator
Uniform Motion Calculator: any two of three: speed, distance, time.
Use calculator →Uniformly Accelerated Motion calculator
Uniformly Accelerated Motion calculator: v₀, constant acceleration a, and time t.
Use calculator →Vertical Throw Calculator
Vertical Throw Calculator: Upward throw (axis upward):.
Use calculator →Wavelength calculator
Wavelength calculator: wave speed and frequency.
Use calculator →Wire Resistance Calculator
Wire Resistance Calculator: ρ [Ω·m], l [m] and S [m²].
Use calculator →Work W = F·s calculator
Work W = F·s calculator: force and distance.
Use calculator →Projectile motion calculator
Projectile motion calculator: v₀, angle, and launch height h₀.
Use calculator →Incline with friction calculator
Incline with friction calculator: angle α [°] and μ.
Use calculator →Stopping distance calculator
Stopping distance calculator: speed, reaction time, and deceleration.
Use calculator →SUVAT equations calculator
SUVAT equations calculator: exactly three of the five fields.
Use calculator →Articles
Short guides for the formulas in this category. Each article leads to a calculator.