Use a level to extend that line across the width of the inside of the cabinet wall.
Convert cabinet to garbage drawer.
Then measure the height from the bottom of the cabinet to the top of your drawer slide plus another 1 8 for clearance.
As one of my customers put it it brings the contents of the cabinet to you instead of you having to go into the cabinet and scrounge around for them it s relatively easy to convert a cabinet from doors to drawers.
Since the hole in my cabinet was actually a little wider than the height of the doors i wanted to be able to re use the center frame piece to build out the cabinet frame to the correct width.
That number is how high on the cabinet door you need to attach your drawer.
Measure the distance from the bottom of an adjacent cabinet door to the bottom of the interior cabinet.
This step in the process to convert shelves to drawers will only be necessary if you have face framed cabinets like i do.