I make lap size also but I always seem to measure the beds in my house to figure out what I want. I have a twin, queen and king, no full size. Typically, I end up with somewhere in the twin size range. Since mattresses are thicker now, I want to make certain the quilt hangs over the mattress overlapping the dust ruffle of the box springs. But some beds now only have frames no box springs. I don't trust older patterns sizes and always double check. One of these days I'll write it down.