Physics calculators
Every key physics formula, as a quick interactive calculator. No signup, no ads.
Mechanics, gravitation and orbits
Projectile motion
Range, max height, time of flight, trajectory.
Open the calculator →Centripetal force
F = mv²/r, plus period and angular velocity.
Open the calculator →Banking angle
Design angle for a banked curve, or design speed.
Open the calculator →Universal gravitation
F = G m₁m₂/r² between any two masses.
Open the calculator →Escape velocity
v_esc = √(2GM/r) for any body, with planet presets.
Open the calculator →Kepler's third law
Solve T²/r³ = 4π²/(GM) either way around.
Open the calculator →Orbital energy
K, U, E for any circular orbit plus transfer energy.
Open the calculator →Electromagnetism
Lorentz force / motor effect
F = qvB sin θ for charges, F = BIL sin θ for wires.
Open the calculator →DC motor torque
τ = NBIA cos θ for a current-carrying coil.
Open the calculator →Induced EMF
Faraday: ε = -N ΔΦ/Δt.
Open the calculator →Transformer
V_p/V_s = N_p/N_s and V_p I_p = V_s I_s.
Open the calculator →Electric field
E = V/d, F = qE, W = qV.
Open the calculator →Waves and the nature of light
Wavelength and frequency
c = fλ plus photon energy E = hf.
Open the calculator →Doppler shift
Sound and light, including cosmological redshift.
Open the calculator →Polarisation (Malus's law)
I = I₀ cos²θ.
Open the calculator →Blackbody (Wien, Stefan-Boltzmann)
λ_max T = b and P = σAT⁴.
Open the calculator →Photoelectric effect
K_max = hf − φ with metal presets.
Open the calculator →Mass-energy (E = mc²)
Convert between mass and energy.
Open the calculator →Special relativity
γ, time dilation, length contraction, relativistic mass.
Open the calculator →