The amount of magnetism [brmax at the center] of a magnet is measured in Gauss. This is a measure of the penetration of a magnet. Below is a table of the Gauss ratings of the most popular neodymium magnets:
Grade Gauss
N35 11,700-12,100
N38 12,100-12,500
N40 12,600-12,900
N42 12,900-13,200
N45 13,500-13,800
N48 14,000-14,200
N50 14,300-14,500
N52 14,600-14,800