About the Time Dilation Calculator
See exactly how much time slows down for a moving observer, according to special relativity.
What it is
The Time Dilation Calculator applies special relativity's time dilation formula to a chosen velocity (as a fraction of light speed) and elapsed time, computing the Lorentz factor and the corresponding time experienced by a moving observer compared to a stationary one.
Features
Lorentz factor
See ฮณ = 1/โ(1 โ vยฒ/cยฒ) computed precisely for any velocity.
Real-world presets
From the ISS's orbital speed to velocities near light speed.
Adaptive time formatting
Results shown in seconds, minutes, hours, or days as appropriate.
Time-lost readout
See exactly how much time the moving observer "loses" compared to the stationary one.