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Twin Paradox

Calculate Twin Paradox instantly with the exact formula and a worked example.

Twin Paradox

Earth time, yrs
Speed, fraction of c
Twin's time
8.7178years
t = T·√(1 − v²/c²)Calculate Twin Paradox instantly with the exact formula and a worked example.
On Earth
20 yrs
For twin
8,72 yrs
γ
2,294

More about: Twin Paradox

What it calculates

The “Twin Paradox” calculator computes Twin's time in years from 2 parameters: earth time, yrs, speed, fraction of c.

A standard physics formula used in educational and engineering tasks.

Example calculation

With parameters Earth time, yrs = 20, Speed, fraction of c = 0.9 the result is 8.72 years (t = T·√(1 − v²/c²)).

How to use

  1. Enter earth time, yrs and speed, fraction of c — each field above is adjustable with a slider.
  2. Twin's time (years) is calculated automatically as you type.
  3. Check the worked example below to see the formula applied to real numbers.
  4. Copy the result or bookmark this calculator.

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FAQ

How is Twin Paradox calculated?
The Twin Paradox calculator computes Twin's time (in years) from earth time, yrs, speed, fraction of c. Enter your values above and the exact formula is applied instantly; a worked example with real numbers is shown below.
Is the Twin Paradox calculator free?
Yes. It is completely free, needs no signup, runs entirely in your browser, and sends no data to any server.

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