Length To Weight

Weighing fish by measuring them helps minimize any potential harm to the fish.

Although there is no doubt that fish can have different weights for the same length dependent on several factors – whether they are gravid, post spawning, sick or healthy, have good access to food-stocks etc., weight estimation based on a fish’s length offers a credible alternative to physically weighing them and helps reduce any potential damage to the fish.

We have developed a series of interactive weight for length curves which will not only enable you to ‘weigh’ a particular fish but also gain an insight as to how weight varies by species.

Get a graph
To get a length / weight graph for a particular species of fish just select it from the following dropdown.NB:: Weights are in Lbs



Top Ten – Quick weigh !
For these common species, just enter the measurement (in cms) of your fish’s length and the calculator will do the rest!

Input Length (cms)

Fish Weight
Ballan 0
Cod 0
Coalfish 0
Pollack 0
Bass 0
Haddock 0
Whiting 0
Flounder 0
Plaice 0
Thornback 0
Common skate weight charts are also available for both female and male fish.

NB:: The weights are guidelines, not absolutes. The graphs and tables are based on 1000’s of observations made by a variety of scientific bodies over the past three decades or so using standard fish up to large, but seldom extraordinary, sizes (because there are so few extraordinary fish !).



It is important to recognize that the difference between an estimated fish and its real weight will only be minor in the overall picture and the main purpose of using weight-estimation is to release the fish unharmed. SSACN does not support killing a fish purely to see if it is of record size.If anyone has any historic accurate records of weight / length for any species, they could be very useful in refining our models and we would be very grateful for a copy – just use the ‘Contact Us’ page.

Please note :: Unless otherwise identified, the fish drawings used are copyright and by kind permission of Dietrich Burkel.