Plywood Thickness: Nominal Sizes, Actual Inches & 32nds

A fraction can be converted to 32nds by multiplying the numerator and denominator by the same number. These are mathematical conversions of the stated fraction; they do not guarantee the measured thickness of a particular plywood sheet.

For a fraction over 32, divide the numerator by 32. For example, 23 ÷ 32 = 0.71875 inches.

Plywood labels may use a Performance Category that corresponds to a traditional nominal thickness, while the panel itself is marked with its decimal thickness. APA explains that a panel labeled 1/2 Performance Category will commonly be 15/32 inch, and a 3/4 Performance Category panel commonly 23/32 inch. APA also notes 19/32-inch panels as a common counterpart to traditional 5/8-inch panels. These are product-category references, not a promise that every panel measures identically.

APA's tolerance guidance emphasizes checking the panel's actual marking and specification. Thickness can vary within the applicable manufacturing tolerance and with moisture conditions. Read the stamp on the sheet and the product documentation when a precise fit matters.

As a fraction, 5/8 inch equals exactly 20/32 inch, because 5/8 × 4/4 = 20/32. That is 0.625 inches mathematically.

However, a plywood panel sold under a traditional nominal 5/8-inch label may use a performance category and measured thickness such as 19/32 inch, depending on its product marking. So the fraction conversion and the physical sheet thickness are related but not always the same thing.

23/32 inch is 0.71875 inches, or about 0.719 inches. APA identifies 23/32-inch panels as a common panel thickness associated with the traditional 3/4-inch Performance Category. Check the sheet stamp: the nominal category used in a building plan may not be the exact measured thickness needed for a tight joint or hardware fit.

For structural use, do not choose a panel by thickness alone. Grade, span rating, exposure classification, support spacing and fastener requirements also matter.

What is 5/8 inch in 32nds?

It is 20/32 inch, exactly. A plywood panel marketed in a 5/8-inch nominal category may have a different marked panel thickness, such as 19/32 inch; check the product label.

How many inches is 23/32 plywood?

23/32 inch is 0.71875 inches, about 0.719 inches.

What is 22/32 in inches?

22/32 inch simplifies to 11/16 inch, or 0.6875 inches.

What is 11/32 in inches?

11/32 inch is 0.34375 inches.

Is 3/4-inch plywood really 3/4 inch thick?

Not always. APA says 3/4 Performance Category panels commonly correspond to 23/32-inch panel thickness. Read the manufacturer's panel stamp for the exact product.