Figuring Northern weight by length

[tip-up king]

What is the pounds per inch conversion for northerns?

[tonyjor]

From the Sporttsman's Connection Map Book -

inches/estimated pounds

24 / 3.9

25 / 4.4

26 / 5.0

27 / 5.6

28 / 6.2

29 / 7.0

30 / 7.7

31 / 8.5

32 / 9.3

33 / 10.2

34 / 11.2

35 / 12.2

36 / 13.3

37 / 14.5

38 / 15.7

39 / 16.9

40 / 18.3

41 / 19.6

42 / 21.2

Remember, these are estimates based on an average. Your fish could weigh more or less depending on time of year, lake size, and forage.

[Cooter]

Only up to 42 inches? Oh, must be a MN publication

[Griggs]

hmm that seems a little on the heavy side. Then again, it could be my scale. My friend just caught a pretty fat 29.5" and the scale said 6 lbs. I've caught quite a few in that ballpark, just seems heavy. But I also think I'll be buying a new scale this year.

[muskieboy46]

i've also noticed that those "estimations" seem to be very generous. All my big fish above 40inch have been at least 5 pounds less then those say they should be.

[LocalGuide]

I would say from 23" to 42" its a little off.

From top to bottom I would guess -.5lbs to -2lbs off.

This winter I just caught a 31" that was 7.5lbs.

So it isnt that far off.

[WMRP Member]

Use the same formula as is used on Muskies. Its length x girth x girth divided by 800.