The other classic way of checking saddle height is to sit on the saddle normally, and put your heel on the pedal. Your leg should just about be locked out.
I think my inside leg is 33" It was a nightmare when I was buying my bike. I was on the borderline of 19" or 20" I was the tallest size for the 19 and the shortest for the 20. I am always that inbetween size for everything
Leg size is it that important ? The biggest problem setting up a bike is reach which you can adjust by stem length and angle but it costs a lot for trial and error and getting it wrong makes for a very uncomfortable ride.
I put my 'dimensions' in, and then compared what it came up with against my MTB setup - pretty much ball-park - and where it was different, that had already been a calculated decision on my part.
Seems rather than focus on 'size', look at dimensions and take a tape measure when you next look at a bike.
I have always raised saddle on long rides, if I am going on a stop/start ride around town I lower the saddle for the convenience of stopping at trffic lights etc.
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