Recently, one of the users asked to calculate "How many cubic meters in a single board; the calculation of the cubic capacity of the lumber, in general". And another asked - "How many wooden boards (with certain sizes) in one cubic meter".
These tasks are reversed so there are two calculators. First one was this - Calculation of volume in cubic meters by the size of one unit of output and then I've decided to publish them both.
So, the first calculator calculates the volume by the size of the board and overall amount of boards and the second one calculates approximate amount of boards (rounded down) by the size of the board and overall volume.