PrimEx results for the Neutral Pion Radiative Width.

The $\pi^{\mathrm{0}}\to \gamma \gamma $ decay amplitude is one of the most precisely calculable values in the low energy QCD. The PrimEx-I and PrimEx-II experiments used Primakoff effect to measure $\pi^{\mathrm{0}}$ radiative decay width. I will present the combined result of both PrimEx experiments performed in Hall-B at Jefferson Lab. The PrimEx-I experiment performed in 2004 achieved a precision of 2.8{\%}. PrimEx-II has been conducted in 2010 with a collection of five times more statistics and achieved 1.6{\%} precision. This measurement gives a possibility to check QCD predictions at 1.5{\%} level.