It doesn't work that way.
What you do, is calculate it by the plank.
As you lay, there is no wastage, since the offcut from the previous row
starts the next. Or better from the row before last.
What IS wasted is rows that have to be ripped down the middle at the
last edge(s) you lay.
What I did on advice, was to calculate how many rows I needed, and round
up to two more than that, to allow for a half plank at each end since I
started in the middle, then multiply that by the room width to get
linear meters, and round up to the next pack.
I ended up with less than half a board of useable material left. And a
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