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How Do You Measure A Mirror?
To accurately measure for a mirror, remember that mirrors are framed most of the time and the frame sizes are standard.
So a normal size is 24×30 usually, the wood adds 2 to 4 inches around the mirror, so it would end up being a 32×38 size you have to make on the wall.
Use your moulding width to accurately get the size you have available on your wall.