fresh to salt weight conversion

[bowtieman427]

Rule of thumb start by adding 2.5 - 3% more total weight. You do not need dispalcement or Volume to figure it out. You only need to know your total weight you + your gear.  First, you must get yourself perfectly neutral bouyent in fresh water. Next, with all your gear it took to do this go wiegh yourself and then all your gear add it up (make sure your gear is dry). The displacement or volume is not necessary. We know density of both fresh and salt water (volume cancels out) and can find your total weight with gear. given density of salt water = 64lbs/ft^3 density of fresh water = 62lbs/ft^3
(density of salt water / density of fresh water)
((64 / 62.4)X (you + all gear dry weight)) - ( you + all gear dry weight) =total weight you need to add to your neutrally bouyant fresh water wieght to be neutrally bouyant in salt water.
if you and your gear weighed 232 you would need to add 5.948lbs or 6lbs