What is the Lorentz contraction equation for bodies at relativistic speeds?

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I need an equation to find to what extent bodies stretch or compress reaching relativistic speeds. Thank you:)
 
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The Lorentz contraction:

L'=\frac{1}{\gamma}L

Where gamma is the Lorentz factor:

\gamma = \frac{1}{\sqrt{1-\frac{v^2}{c^2}}}
 

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