Entire stencil measures 5.5" x 5.5". This is designed to fit BOTH the 3x4 AND 3.5 x 4.5 cutter 

Actual big design measures 3.4 tall x 3.9 wide. 
Small PYO is 2.9x2.9 PLEASE be sure to pick the right size for you.  These are designed for cookies flooded all the way to the edge.