alt Hacker NewsYep, it doesn't particularly matter if something that's actually 212 or 198 is entered as 200. Sometimes you'll be slightly over, sometimes slightly below - just try to be accurate and these small mistakes average out.
Typically I figure out the actual weight/volume once or twice to get a sense of how much it is, then just eyeball it most of the time and go for the same amount as last time I measured.
I worked on calorie counting software in the 00's. We had desktop software that just used floats, meanwhile the Palm Pilot software was all integer math (counting things in 10ths and 100ths when that precision was needed.)
We'd get emails about people seeing 577 calories on the Palm Pilot and 578 calories on the desktop. "None of the numbers are that accurate anyway!" was a sensible answer but not very brand aligned.