More accurate to turn input 10 turns and count output, or even 100 turns.
Hard to precisely determine ratio from a single fraction of a turn, though one turn is enough to answer if overdrive or not.

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-