Welcome to FishWeightCalculator.com, the angler’s essential tool for estimating catch size responsibly.
Every angler knows the feeling: you land the fish of a lifetime, but in the excitement, you realize you left your scale in the truck—or worse, the batteries are dead. In the past, this meant guessing. Today, it means using precision math.
Our Mission: Conservation Through Calculation We built this tool to support the “Catch and Release” movement. Hanging a heavy fish vertically on a traditional lip-grip scale can cause severe internal damage, separate vertebrae, and reduce survival rates.
By measuring just the Length and Girth of your catch while it remains wet and supported, you can obtain a highly accurate weight estimate without ever risking the fish’s health.
Why Use Our Tool?
Species-Specific Algorithms: A Bass is not built like a Pike. We use distinct “Shape Factors” for different species—from stocky Carp to slender Barracuda—to ensure our math matches reality.
Global Standards: Whether you measure in inches and pounds (USA/UK) or centimeters and kilograms (Australia/South Africa), our tool converts instantly.
Catch Logging: Save your day’s success in our virtual “Catch Log” to track your progress over time.
We believe the best trophy is a picture of a healthy fish swimming away strong.