I was just thinking that ^^ you can be eating 200kcal a day and not be losing any weight, if your metabolism is used to it. Theoretically, (I can't remember the exact statistic but I read something somewhere that basically said this) if you eat one less apple per week, you'll lose 2lbs in a year. Well that's complete crap, because the body isn't a calculator - other factors come into it. In fact eating one more apple a week might help you lose weight because of the way they're digested. Even if you decided to cut out 2 chocolate bars a week, it'd be a healthy cut, and you might lose a pound or two, but it'd be in the first month and then it'd stop the metabolism adapts.
I'm 5' 5", weigh 133 and want to weigh 115... it told me that if I eat 1300kcal a day, I'll lose 1lb a week with no exercise. If only lol. I'm not most people but I'm a recovered/recovering bulimic (with digestive problems as well) and I normally eat 800-1200kcal a day. So according to this I should be losing 1-2lbs a week. Not so... I maintain, because my metabolism has got used to it and learned how to make it last. Restrictive diets definitely ruin your metabolism in the long run 😢 If you've already been on a particular diet for a while, it'll be different. If you were eating 3000kcal a day, you could lose weight by reducing it to 2000kcal a day without any exercise, and you'd lose it fast. It all depends. But I think that site would be good for someone who doesn't make a particular effort to exercise and eats about 2000kcal a day.
Or (because I'm a grammar school girl lol) you could turn it into a mathematical equation. I'll use my numbers as an example:
a = current calories according to the link (ie 2000kcal, will be the same for everyone)
b = goal calories for losing 1lb a week with no exercise (eg 1300kcal, whatever your results page says)
c = actual current calories (eg 1100kcal)
x = actual goal calories for losing 1lb a week with no exercise
So. Here's your equation:
c /(a/b) = x
1100/(2000/1300) = 715.
So, I'd have to be eating 715kcal a day. Which I knew, because if I eat 800kcal a day I lose half a pound to a pound every day for a few days to a week =P see how it's not always accurate though? Either way, try my equation for an estimate of what'll at least help you lose weight =] and SparkPeople is definitely helpful for general healthy eating too!