I'm on keto - been so for more than a year. It's the most awesome way of eating. You don't need any calculators. Just eat the right foods and everything else will fall into place. A sample menu from a day: Breakfast: eggs and bacon Lunch: Chicken with salad and olive oil dressing Dinner: Beef or fis...

I'm also 16:8 (most days of the week).

On IF, any calories is breaking your fast. To stick to your IF, drink your coffee black - that's the only way to stick to your fasted period.