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The chart below will help you estimate the weight of fish based on the length. After the chart there is a formula which can be used with any species of fish. The chart information was
provided by Northland Fishing Tackle.
| WALLEYE | NORTHERN | LARGEMOUTH BASS | CRAPPIE | ||||
| Length | Weight | Length | Weight | Length | Weight | Length | Weight |
| 14" | 1.0 | 24" | 3.9 | 12" | 1.0 | 8" | 0.4 |
| 15" | 1.2 | 25" | 4.4 | 13" | 1.3 | 9" | 0.6 |
| 16" | 1.5 | 26" | 5.0 | 14" | 1.7 | 10" | 0.8 |
| 17" | 1.8 | 27" | 5.6 | 15" | 2.1 | 11" | 1.0 |
| 18" | 2.2 | 28" | 6.2 | 16" | 2.5 | 12" | 1.2 |
| 19" | 2.5 | 29" | 7.0 | 17" | 3.0 | 13" | 1.4 |
| 20" | 3.0 | 30" | 7.7 | 18" | 3.6 | 14" | 1.6 |
| 21" | 3.4 | 31" | 8.5 | 19" | 4.2 | 15" | 1.9 |
| 22" | 3.9 | 32" | 9.3 | 20" | 5.0 | 16" | 2.2 |
| 23" | 4.5 | 33" | 10.2 | 21" | 5.7 | 17" | 2.5 |
| 24" | 5.1 | 34" | 11.2 | 22" | 6.6 | ||
| 25" | 5.7 | 35" | 12.2 | 23" | 7.6 | ||
| 26" | 6.5 | 36" | 13.3 | ||||
| 27" | 7.2 | 37" | 14.5 | ||||
| 28" | 8.1 | 38" | 15.7 | ||||
| 29" | 9.0 | 39" | 16.9 | ||||
| 30" | 9.9 | 40" | 18.3 | ||||
| 31" | 10.5 | 41" | 19.6 | ||||
| 42" | 21.2 |
((G * G) * L) / K = Lbs
K is a Constant. For slender fish like trout, walleye and
pike, K=900. For fat bodied fish like bass, bluegill or
permit, K=800.
Large Mouth Bass Example: Girth = 18" and Length = 17"
((18 * 18) * 17) / 800 = Lbs
(324 * 17) / 800
5508 / 800 = 6.9 pounds
Walleye: (Length x Length x Length)/2,700
For example: An 18-inch walleye weighs approximately 2.16 pounds [5,832 (18 x 18 x 18) divided by 2,700 = 2.16].
Pike: (Length x Length x Length)/3,500
Sunfish: (Length x Length x Length)/1,200
Bass: [Length x Length x Girth (girth is the distance around the body)]/1,200
Trout: (Length x Girth x Girth)/800
Comments or suggestions Email always welcome.