Just wanted to confirm the above.
Intake and output is measured in cc's (mL is the same as cc's, I believe).
Usually, the cups are 120 cc, 240 cc, 360 cc... Anything that melts is considered a liquid also, like Jello. If they drink half of a 120 cup, it's 60 cc. If they drink that half plus a 240 cup, it's 300 cc. Just a little math.
As for food, it's usually measured in 25% increments. 1/4 of the plate is 25%, 1/2 is 50%, 3/4 is 75% or all of it is 100%. Easy.
Catheters are emptied into graduated cylinders and measurements are on the side of the cylinder. Set the container on a flat surface and see what it says.
Since you didn't get that training, I want to add that when emptying catheters you are supposed to set a paper towel underneath the cylinder.
Potty hats are put underneath the lid of the toilet seat and it has measurements on it also.
BMs are measured small, medium, and large. If you work in LTC, you will get used to your residents and learn how much is actually a small or large for that person. Gross, but true! Lol!