It was fairly close after I subtracted 8# for my steel BP (which it didn't ask about.)
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Very surprised but just tried this calculator and it is pretty well bang on for me. I have 3 mm, 5 mm, 7mm (one and two piece) wet suits and a dry suit. I punched in the numbers and the calculator came up either right on or very close for me in both fresh and salt water.
Give it a try and does it work for you?
Estimated Diving Weight Calculator | DiveBuddy.com