I started out at 318 and eating 2,800-3,000 calories a day, and I was losing weight. But I was probably consuming 4,000-6,000 calories a day of fast food and soda for half a decade before I went on this diet. So 3,000 calories was definitely a caloric deficit for 300 lb me.

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That didn't last long though. As I've scaled down my weight (235), now to get the same weight loss, I need to consistently be in the 1,600-1,800 range.

If the calculator doesnt work for you, I would consult a doctor. You might have a thyroid or other condition that makes it impossible to lose weight through normal means.

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I had no condition. I was just addicted to sugar and overeating fast food.