The factors for conversions between standard and total lengths are presented for the following Michigan fishes: bluegill (Lepomis m. macrochirus), yellow perch (Perca flavescens), pumpkinseed (Lepomis gibbosus), smallmouth black bass (Micropterus d. dolomicu), largemouth black bass (Huro salmoides), rock bass (Ambloplites r. rupestris), and the northern pike (Esox lucius). The ratio of standard to total length was found to increase progressively in all species as the length of the fish increases. The values of n in the length‐weight equation, W = cL, which was derived for each of the species listed above, ranged from 2.969 for the rock bass to 3.199 for the pumpkinseed. When numbers of fish were large actual weights agreed well with those computed from the equations. Coefficients of condition (K in the metric system and C in the English system) are presented for the seven species. The methods followed in the compilation and analysis of the data are described.