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Plywood sizesStandard sheet dimensions and the nominal-versus-actual thickness gap across the range.
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Quick Answers

Is 23/32" the same as 3/4" plywood?
Yes. They are the same panel under two labels. 3/4" is the nominal (named) thickness and 23/32" is the actual milled thickness after sanding and finishing. The difference is about 1/32 of an inch, so the two are interchangeable for most uses.
What is the actual thickness of 3/4" plywood?
About 23/32", which is 0.71875" or roughly 18.26 mm. The full nominal 3/4" equals 19.05 mm, so the milled panel sits about 0.8 mm under its named size.
How many mm is 3/4" plywood?
Nominal 3/4" is 19.05 mm, but the actual milled panel measures about 18.26 mm (23/32"). Most suppliers round this to ~18 mm on metric spec sheets.
Does the 1/32" difference between 23/32" and 3/4" matter?
Not for subfloor, sheathing or general framing, where the two are interchangeable. It does matter for cabinet joinery, dado and rabbet fits, and flush transitions, where you should cut to the actual measured 23/32" thickness rather than the nominal name.