"Rawhide Lampshades built to last a Lifetime"
The easiest way to measure shade height is to set the shade on a flat surface. Put the end of the tape measure down thru the top of the shade touching the table, sight across the top of the shade and read the tape.
Also, on a harp mounted shade, determine how far down the washer should set from the top of the shade.
Step 2 How to measure a lamp shade
Top diameter x Bottom diameter x Height ( Not Slant )