The proper way to measure the seat size of a Sports Saddle is to
measure between the cantle and the pommel at the nearest points
and add 6 inches. Don't include the trim rolls in your measurement.
So, if you measure 9½ between
the two nearest points, not including the pommel and cantle trim rolls, add 6 inches,
resulting in a 15 ½ seat. Easy once you know the formulae.
Take a close look at the white line between the cantle and pommel
in the photo below.
If you have a SS or are currently trying someone else's then do yourself a BIG favor and measure that saddle for its actual size. Do not go by what the owner says it is. This will be very helpful because if that saddle is a pretty good fit for you and you want to order one the same or similar size then you must know exaclty what size the saddle is that you are trying.

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