Relativistic Mass Calculator

Calculate relativistic mass and energy at high velocities

Rest Mass (kg):

Velocity (m/s):

c = 2.998e8 m/s (speed of light)

Note: Velocity must be less than the speed of light

γ = 1/√(1 - v²/c²) (Lorentz factor)

m = γm₀ (relativistic mass)

KE = (γ - 1)m₀c² (kinetic energy)

E = γm₀c² (total energy)