Gulf States Marine Fisheries Commission

Fish Length-to-Weight Conversion

Choose the species of fish and input the length in inches.

Species

ALMACO JACK ATLANTIC SHARPNOSE SHARK ATLANTIC SPADEFISH BANDED RUDDERFISH BLACK DRUM BLACK GROUPER BLACK SEA BASS BLACKFIN TUNA BLACKTIP SHARK BLUE RUNNER BLUEFISH COBIA COMMON SNOOK CREVALLE JACK DOLPHIN FLORIDA POMPANO GAFFTOPSAIL CATFISH GAG GRAY SNAPPER GRAY TRIGGERFISH GREAT BARRACUDA GREATER AMBERJACK GULF FLOUNDER GULF KINGFISH HARDHEAD CATFISH IRISH POMPANO KING MACKEREL LADYFISH LANE SNAPPER LITTLE TUNNY MUTTON SNAPPER PERMIT POMPANO DOLPHIN RED DRUM RED GROUPER RED PORGY RED SNAPPER SAND SEATROUT SCAMP SHEEPSHEAD SKIPJACK TUNA SOUTHERN FLOUNDER SOUTHERN KINGFISH SPANISH MACKEREL SPOTTED SEATROUT TRIPLETAIL VERMILION SNAPPER WAHOO WEAKFISH YELLOWFIN TUNA YELLOWTAIL SNAPPER

Length

Disclaimer: All weights are calculated averages derived from lengths of recreationally harvested fish only. Inaccurate results may be produced by entering a fish of unusually small or large size for this species.

The correct procedures for measuring the various types of fish are as follows:

Sharks and Sturgeons are measured from the tip of the snout to the center of the fork of the tail.

Skates and Rays are measured from the tip of the snout to the base of the tail.

Billfish and Swordfish are measured from the tip of the lower jaw to the center of the fork of the tail.

All other species are measured from the most anterior tip of the longest jaw (mouth closed) or end of snout to the posterior tip of the tail at its center line. This procedure is the same whether the tail forks in (e.g., Mackerels) or protrudes out (e.g., Flounders) and is called fork length.