It's pretty close.

www.bcfishingreports.com/fish_calculator.html


I've lenght, girth and weighed lots of fish with my digital Normak and found there is no perfect calulation. All fish, even within their own species vary alittle. I bought a Shimano spring scale at Walmart, which is adjustable, it's dead on.

Go to the sewing dept and they have small, plastic, retractable 5ft reel tape measures for about 2 bucks that you can carry in your vest

G-Man,
Thanks for posting that I had lost the link and was having trouble finding it again. I like that calculator because it seperates salmon from steelhead.

There is a calculator here somewhere on this site. A friend of mine used it to calculate my sons fish. It was a 42" x 28" girth King. This calculator makes it a 50+# king. It is way off. It weighed out after bled and sitting in the box all afternoon at 41 (certified scale). The PP calc showed it to be 42.5. Which should be right on. The bc one is off.

Heres Bob's.
http://www.piscatorialpursuits.com/resourcecenter/weightcalculator.htm

This is STRANGE!

The pic of the King I posted 2 weeks ago was 42" x 25."
It was a white king if that matters?

The BC fishing regs book's calculation on a 42" king is 45lbs.

Bob's calculator says it would be 33.87lbs... NOT!

The calculator I posted says it was 40.38lbs.

My wife's $100.00 diet "Do-It All" scale said it was 43lbs. (27% body fat and should have a calorie intake of 1,700 per day )


Why such a differance?

I'd say the one you are pointing at is awfully heavy.

Generally speaking, lenth times girth squared divided by 775 is the standard formula for estimating the live weight of a fish.

Some will bump the divisor up or down a bit based on characteristics of fish in a certain area / or species variation.

The BC Reports calculator seems especially heavy on salmon with a divisor of 650.

I plugged the numbers of the world-record king salmon into ... a fish that weighed 97 + plus when weighed many hours after being caught. It's believed that the fish was probably a tad over 100 pounds when it came aboard.

The calculator that GMan refers to puts Les' fish at over 126 pounds, the one I use at 106 ... certainly much closer to the actual weight.

Lots of formulas out there ... none will be perfect for every fish, but the one I use I think is the most consistent.

By the way, Les Anderson (a relative of Fishgal, must be in the blood) who caught the world-record fish recently passed away ... for a little more info about Les: http://www.adn.com/outdoors/story/3865153p-3888562c.html