[J0seph]

Never found any in the usual places, but I bet you can find a big lumber supplier who will have it or can order it. I live in the desert now, and my supplier is an hour's drive away, and so far as I know, they only have Baltic Birch ply in metric, 5x5 feet square.

l think 2x and 4x is actually 1 5/8ths and 3 5/8ths, which is to say 41.28mm and 92.58mm. To confuse us all even further, lumber is sold by the board foot, which is 12 inches square by one inch deep. Don't know how they sell it in metric countries, but the metric equivalent is 304.88 mm square, by 24.50mm.

Out in the shop I have a mesuring stick that's one meter long, with both metric and Imperial numbers on the same face, so I can, if needed, just look and see how long a metric measure is in inches and feet. I do think metric is easier in most ways, but I can't visualize a meter and think of it as a "fat" yard.

I found this on the web. It's a conversion chart. Detailed down to 32nds of an inch.

I own a cabinet shop. When ordering plywood for a job I must specifi domestic or import. Domestic is imperial measure and import is metric. The domestic plywood has much thicker outer veneer than the import, sometimes as much as 3 time the thickness. TRhe core veneers are usually better wood in the domestic and the domestic is less prone to warp. It really depends on what you are making. That being said, the domestic is about 25% more in cost.

 

[J0seph]

It occured to me that I believe "real" Baltic Birch plywood (sold in 5' x 5' sheets, not the common 4' x 8') is specified with the correct actual thickness. It also has many more layers (I think 13 for a 3/4" vs. 5-7 in regular plywood) and is supposed to have no voids.

It is called 1/2" but is actually metric. At least all I have used in the past few years has been.