Actually, one ml of paste does weigh ~one gram, I checked.I looked at that, but ml doesn't work with a paste very well (and I'd have to do conversions with imperial to metric weights). It was easier to look up the actual mg/kg of fenbendazole and see if I could maths it up with the 18.75% (0.188mg/g). But then discovered that the dose for chickens is the same on the high end as rabbits. So using the gradations on the rabbit tube makes more sense than trying to weigh out the right amount in such tiny amounts.