CDX plywood should be a minimum of 7/16 inch thick. The thicknesses are as follows: 7/16-, 15/32- and 1/2-inch-thick panels require joists spaced 16 inches on center; 19/32- and 5/8-inch-thick panels require joists spaced 20 inches on center.
Depending on if what the floor finish will be — tile, hardwood or carpet — there are different recommendations for the actual thickness of the plywood you'll need.
The most common thickness of plywood is 1/2 inch, but can range from 1/8 inch to 3 inches.
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Plytanium Plywood Sturd-I-Floor for sub-floor applications is recommended by. 4' x 8' panels are available in 19/32, 23/32 and 1-1/8 category thicknesses.