Calculate how time slows down for objects moving at relativistic speeds.
Velocity & Duration
c
units
Calculation Results
Enter velocity (less than c) and duration
About this calculator
Quick Reference
t'Dilated Time
tProper Time (Stationary)
vVelocity
cSpeed of Light
Overview
According to Einstein's Special Relativity, time is not absolute. As an object's velocity approaches the speed of light, time for that object slows down relative to a stationary observer.
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Pro Tips
The speed of light (c) is approximately 299,792,458 m/s.
Time dilation is negligible at everyday speeds.
The Lorentz factor (γ) describes the magnitude of time dilation.
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Fun Facts
"GPS satellites must account for time dilation to remain accurate; their clocks run slightly faster than those on Earth."
"If you traveled at 99% the speed of light for 1 year, about 7 years would have passed on Earth."
"The 'Twin Paradox' is a famous thought experiment illustrating time dilation."
