*peeks back in after months away*

How do you know how many calories you should consume in a day. I can't lose anything, even though I haven't been cheating, my keto strips always read at least the second from the darkest option...my doctor and my husband both say that I don't eat enough, and I just plugged in one days consumption into fitday and came up with about 500 calories.

At 5'9" tall and 330 lbs..female...what should I be aiming to eat?

Karen