Just a rough idea or rough formula would be fine. I've got a couple piles of logs that were stacked with a tractor and a grapple bucket (one log at a time) and I'm curious.
FWIW, 2 logs were laid down 90° to the pile, and the rest piled on top so the bottom layer isn't on the ground.
Both piles are roughly 8' tall, all logs are roughly 14' long. One pile is 26' deep the other is 36' deep (front to back). Logs are 12"-14" dia up to about 36" -38" dia. Red Oak, White Oak, Pin Oak, Sugar/Red Maple. Possibly some 12" dia Black Cherry too.
FWIW, 2 logs were laid down 90° to the pile, and the rest piled on top so the bottom layer isn't on the ground.
Both piles are roughly 8' tall, all logs are roughly 14' long. One pile is 26' deep the other is 36' deep (front to back). Logs are 12"-14" dia up to about 36" -38" dia. Red Oak, White Oak, Pin Oak, Sugar/Red Maple. Possibly some 12" dia Black Cherry too.