Scaling Hamelman
"Bread" by Jeffery Hamelman is aimed at professional bakers and secondarily at home bakers. He gives each formula in 3 versions:US - decimal lbs (no ounces) usually for about 22 loavesMetric - Kilograms usually for about 25 loaves (no doubt the difference in quantity is due to the meter being slightly longer than the yard; just kidding)Home - Lbs and oz, usually for 2 loavesI
Source: thefreshloaf.com