Relativistic Effect Calculator

Velocity (relative to that of light in vacuum)

Note: This is the velocity of the other frame relative to the observer's frame. Valid range: -1 to 1. Example: 0.5 is half the velocity of light.

Resulting Lorentz factor

Resulting time dilation

Note: This is the amount by which a period of time measured in the other frame appears to be lengthened in the observer's frame.

Resulting Lorentz contraction

Note: This is the amount by which a length or distance measured in the other frame appears to be shortened in the observer's frame.

Observed contraction