About These Formulas
These formulas have been developed through extensive empirical data and research. While they typically provide good results, please note that they are estimates and actual weights may vary depending on various factors including the fish's condition and season.
Formula Types
Length × Girth² Formula
Weight = (Length × Girth × Girth) / Factor
- • Trout (750)
- • Walleye (750)
- • Pike (900)
- • Catfish (850)
- • Carp (800)
- • Bluegill (1,200)
- • Bonefish (900)
- • Snook (900)
- • Redfish (900)
- • Bluefish (900)
- • Salmon (800)
- • Mackerel (900)
Length² × Girth Formula
Weight = (Length × Length × Girth) / Factor
- • Bass (1,200)
Length³ Formula
Weight = (Length × Length × Length) / Factor
- • Sunfish (1,200)
- • Gar (2,700)
- • Crappie (1,600)
- • Sheepshead (1,200)
- • Flounder (2,500)
Important Notes
- 1. All measurements must be in inches. The app will convert from cm to inches if cm is selected.
- 2. Measure girth at the widest point of the fish
- 3. Length should be total length (tip of snout to tip of tail)
- 4. Results are estimates and may vary based on fish condition and season