There is a way to weigh the stuff on your boat using the boat.

Measure the distance from the boot top or deck to the waterline on each side
amidships. Take all the stuff off and measure again.

Then calculate the pounds that will sink the boat 1 inch thus:

Waterline length x beam (on waterline) x .7 x 5.33 pounds to change draft
one inch.

If your boat has fine ends reduce the .7 a bit or increase it for a full
ended boat.

You can also use this method to calculate how much to raise the boot top for
a certain load or increase in weight.

--
Roger Long