calculating LOD vertex counts

Miscellaneous Forums/General Discussion/calculating LOD vertex counts

is there some sort of universal formula for calculating lod poly counts.
for example I have a character with 2464 tris in the body and need 3 lods plus the top lod

LOD0 2464 tris
LOD1
LOD2
LOD3

can someone help me out on this. i could just guess, but want to be consistent as I have a few of these to do