FREE TOOL · ESTIMATE ONLY
Measure length and girth, then get a quick weight estimate in pounds and kilograms. Built for catch logs, release notes, and field decisions when you do not have a scale.
Estimated weight
3.18 kg
Formula: length² × girth ÷ 800, using inches. Range shows ±15% because body shape, spawn stage, and recent feeding can change real weight.
HOW THE ESTIMATE WORKS
This calculator uses the common field formula weight = length² × girth ÷ 800, with length and girth in inches. It is useful when you want to log a catch, compare fish, or make a quick release decision without hanging the fish on a scale.
The result includes a practical ±15% range because two fish with the same length can weigh differently. A thick pre-spawn bass, a lean trout, and a recently fed saltwater fish will not carry weight the same way. Treat the number as an estimate and keep fish handling time short.
Tackle is built for the next step: log the catch, save the spot, note the conditions, and learn which times, tides, and patterns keep producing fish.
A common field estimate is weight in pounds = length × length × girth ÷ 800, with length and girth measured in inches. It works best as a quick planning or catch-log estimate, not as an official weight.
No. Body shape, spawn stage, and recent feeding can move the real weight above or below the estimate. Use a certified scale for records, tournaments, or any official claim.
Measure around the thickest part of the fish, usually just ahead of the dorsal fin. Keep the tape snug but do not compress the fish.
THE APP BEHIND THE BLOG
Tackle turns these articles into a real-time fishing score for your location. Tides, weather, moon, bait activity — one number, updated every hour.
