Time Dilation Calculator
Calculates the difference in elapsed time between observers due to relative velocity or gravitational potential (Special/General Relativity).
Time Dilation Calculator gives you a faster way to work through practical calculation scenarios without rebuilding the same calculation from scratch every time. Start with Proper Time (seconds), Relative Velocity (m/s), Gravitational Potential (J/kg), and Speed of Light (m/s) and use the live outputs to estimate Time Dilation Factor (Gravity), Time Dilation Factor (Velocity), and Dilated Time (Gravity) (seconds) in one pass. This page is built to help you compare scenarios quickly, validate rough assumptions, and move into a related calculator when you need a second angle on the same problem.
Use The Calculator In A Few Steps
Work through the inputs deliberately, then compare outputs instead of relying on a single scenario.
Scenario Checks
Use these examples to verify the behavior of the calculator before you run your own values.
What Users Usually Need Next
Keep the calculator open while you skim these answers so you can test the scenario that matters.
Related Calculators
These links are chosen to deepen the session and answer the next likely question without sending the user back to search.
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