Twin's time
Calculate Twin's time instantly with the exact formula and a worked example. Free online calculator — no signup.
Twin's time
Earth time, yrs
Speed, fraction of c
Twin's time
8.7178yrs
On Earth
20 yrs
For twin
8,72 yrs
γ
2,294
More about: Twin's time
What it calculates
The “Twin's time” calculator computes Twin's time in yrs 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 yrs (t = T·√(1 − v²/c²)).
How to use
- Enter the parameter values — every field above is adjustable with a slider.
- The result and related metrics are calculated automatically as you type.
- Use the additional metrics shown (if any) where needed.
- Copy the result or bookmark the page.