Estimating Fish Weight

Alaska Fishing Company

Estimating Fish Weight

Wondering how much that salmon weighs and don’t have a scale?

Did you release your trophy king and wonder how much it actually weighed? In Alaska, we are often fishing without any cell service, and have no access to a Salmon weight calculator app. Fortunately, the fish length to weight formula to estimate their weight is quite easy to remember and follow!

Here’s a formula to accurately estimate the weight of a  salmon, steelhead or trout from measurements of length and girth. This king salmon length to weight conversion formula is easy to follow. The girth is measured at the thickest portion of the midsection and the length is measured from the tip of the nose to the tip of the tail. All measurements should be in inches.

Weight Estimator Formula:

Weight (lbs.) = length (in.) x girth (in.) x girth (in.) / 740

Example: A king salmon is 52 inches long and has a girth of 30.5 inches.

The calculation is as follows:

Weight = (52 x 30.5 x 30.5) / 740 = (48,373) / 740 = 65.37 lbs.

Are you interested in Kenai River salmon fishing? Book an Alaska Fishing Trip today with one of our expert Kenai River fishing guides!