vikkivma-
I recommend, that if the scale fluctuations are getting you down, that you stop weighing in every single day. Some people can do this, and deal with the fluctuations, and others cannot.
I recommend that you not go with Daily Plate to figure your calorie requirements, because they are only estimates. They don't work for me, either. Instead, I recommend that you go with trial and error-and find what works for YOUR body, not what is listed on Daily Plate, and other calculators.
Weigh in only on Mondays for a while. Try exercising, and eating 1700-1800 calories every day this week. Next Monday, weigh in. If you don't lose anything at all, or you gain, then you know that 1700-1800 doesn't work for you. Try 1600-1700 the next week, and see what happens on that next Monday weigh in. If you have a loss, then it means that right now, that 1600-1700 would be the correct level for you at this time.
It is going to be different for EVERYONE. One person might lose a pound or two a week on 1800 calories, for another person it might have to be 1300 calories a day. It is all very individual, depending on our metabolism, our exercise level, and our current weight. You simply have to use this process to determine what is the right level for YOU.
Then, once you find it, it might have to be tweaked over time. You might find that you lose a pound a week for a while at a certain calorie level...then, a few months down the line it might stop/stall for a few weeks. That just means that it is time to tweak your plan-either by dropping your calorie range slightly (like from 1600 to 1500 a day) or by increasing your exercise.
Please don't give up...you have to be patient and find the calorie range that works for YOUR body, not an estimate from a website.