A large can of spaghetti sauce weighs 6lbs 10oz.
If I use 18 of these cans, how many gallons is that?

A large can of spaghetti sauce weighs 6lbs 10oz. If I use 18 of these cans, how many gallons is that?

a gallon is a measure
a pound is a weight:)
you could have a pound of feathers and a pound of tomato sauce and they are going to be different in mass.

Dump your sauce in a container.
4 quarts=1 gallon
2 pints= 1 quart
2 cups=1 pint

Or just 'eye' it. That's what I would do:D