Time Dilation Calculator
Calculate relativistic time dilation from velocity and elapsed time using Einstein’s special relativity formula.
Enter motion details
Result
Enter elapsed time and velocity, then calculate the relativistic time difference.
What time dilation means
A moving clock runs slower relative to a stationary observer. The effect becomes significant only at velocities close to the speed of light.
The Lorentz factor
The Lorentz factor γ shows how strongly time, length, and energy are affected by relativistic motion.
Special relativity only
This tool does not include gravitational time dilation, acceleration, orbital motion, or changing velocity.
Frequently asked questions
What formula does this calculator use?
It uses Δτ = Δt × √(1 − v²/c²), where Δτ is the moving observer’s proper time, Δt is stationary-observer time, v is velocity, and c is the speed of light.
Why does time slow down at high speed?
Special relativity requires the speed of light to be the same for all inertial observers. Space and time therefore adjust relative to motion.
Can an object reach the speed of light?
An object with mass cannot reach the speed of light because the energy required would grow without limit.
Does this include gravitational time dilation?
No. Gravitational time dilation is described by general relativity and depends on gravitational potential.
Results are estimates generated locally in your browser from standard scientific formulas and reference data. They are for informational and educational purposes only and are not a substitute for laboratory validation or professional scientific analysis. VisionVix accepts no liability for decisions based on this tool's output.
