Bass Weight Calculator
Estimate largemouth or smallmouth bass weight from length and girth, then compare your catch to the world record.
Quick answer: Standard bass formula: (length × girth²) ÷ 800. Compare your estimate to the 22.25 lb world record (Montgomery Lake, Georgia / Lake Biwa, Japan, 1932).
Standard bass formula: (length × girth²) ÷ 800
of the 22.25 lb largemouth bass world record
Montgomery Lake, Georgia / Lake Biwa, Japan
View species guide →Optional gear for measuring bass
A board gives a fast total-length reading, a scale verifies the estimate, and a fish-friendly net helps keep handling controlled. Compare sizes and current availability before buying.
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- Fish measuring boards Look for a readable scale, raised end stop, and enough length for your target species.
- Water-resistant fishing scales Use a scale when you need a measured weight instead of a length-based estimate.
- Rubberized landing nets A knotless rubberized basket can reduce tangles and help keep the fish supported.
Common questions
How do you calculate bass weight?
Standard bass formula: (length × girth²) ÷ 800. If girth is missing, a length-only formula is used. Estimates are approximate.
What is the bass world record?
The largemouth bass world record is 22.25 lb, caught at Montgomery Lake, Georgia / Lake Biwa, Japan in 1932.
Related species guides: largemouth bass , smallmouth bass