Estimated weight0 lb
Fish Weight By Length Calculator
Estimate fish weight from length when you want a quick catch-log number and do not have a scale available.
How to use this calculator
- Choose or enter the fish length requested by the calculator.
- Use the species or factor that best matches the fish when available.
- Record the estimate as approximate in your fishing notes.
- Use a scale when exact weight matters for records, tournaments, or regulations.
Example uses
Catch log
Estimate the weight of a released fish from a measured length.
Trip comparison
Compare several fish from the same outing without weighing every catch.
Fishing report notes
Create a rough size estimate for personal records.
Helpful notes
- Fish weight varies with species, season, body condition, sex, and forage availability.
- Length-only formulas are rough and can be very different from actual scale weight.
- This calculator is informational and should not be used for official records.