Fish Weight Calculator
Estimate the weight of a fish based on its length and girth.
Your fish's estimated weight will be displayed here.
How to Estimate a Fish's Weight
This calculator uses a common formula to estimate a fish's weight based on its length and girth. This is especially useful for catch-and-release fishing where you want to know the weight without harming the fish. The formula is:
Weight = (Length × Girth²) / C
Where C is a constant that varies by the units used (800 for inches/lbs, 22680 for cm/kg).