Relativity calculators
9 calculators Time Dilation Calculator Special relativity time dilation: t = t0/sqrt(1 - v2/c2). Pick a velocity unit or preset, reverse-solve the speed, with Lorentz gamma and length contraction.
Open Bug-Rivet Paradox Calculator Bug-Rivet Paradox calculator. Get Lorentz factor, contracted lengths in each frame, the critical speed, and a step-by-step resolution of this relativity paradox.
Open E = mc² Calculator Calculate rest energy from mass using Einstein's E = mc². Choose units, get results in joules, kWh, megatons of TNT, and real-world comparisons.
Open Electron Speed Calculator Calculate electron speed from accelerating voltage or kinetic energy. Compare classical and relativistic results, get the Lorentz factor, momentum, and de Broglie wavelength.
Open Gravitational Time Dilation Calculator Calculate gravitational time dilation using the Schwarzschild formula. Enter mass and radius to find how much slower time flows in a gravitational field versus deep space.
Open Length Contraction Calculator Relativistic length contraction calculator. Enter rest length and velocity, get contracted length, Lorentz factor, and % shrinkage. Presets: ISS, muon, LHC proton.
Open Relativistic Kinetic Energy Calculator Calculate relativistic kinetic energy, Lorentz factor, total energy, rest energy, and relativistic momentum for any mass and velocity up to the speed of light.
Open Space Travel Calculator: Relativistic Time Dilation and Ship Time Calculate relativistic space travel: ship time (proper time), Earth time, max velocity, Lorentz factor, and fuel ratio for any destination under constant acceleration.
Open Velocity Addition Calculator Relativistic velocity addition calculator using Einstein's formula. Get the true combined speed, classical comparison, Lorentz factor, and result as a fraction of c.
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