Recently, one of the users asked to calculate "How many cubic meters in a single board, the calculation of the lumber/timber's cubic capacity, in general." And another asked - "How many wooden boards (of certain sizes) in one cubic meter."
These tasks are reversed, so there are two calculators. The first one was this - Total volume calculator, and then I've decided to publish them both under in one place.
So, the first calculator calculates the volume in cubic meters from the size of the one board and number of boards, and the second one calculates the approximate quantity of boards (rounded down) from the size of the board and overall volume in cubic meters