Scooby's calculator seems retarded by the lack of transparency and abhorrent results.  Try entering my exact situation into it. Are you going to enter 7-21 hours/week of 'strenuous exercise'? If so you'll get the retardedly high 3500 figure other calculators dole out on a whim. Do you select 5-6 hours of strenuous exercise? Probably not if the other calculation was so retarded. Let's go with 3-5 hours of moderate exercise, even though we're talking about 21 hours of exercise in my case. 2860 Calories? That's absurd.  Just like the TDEEcalculator that someone else mentioned in the comments the only things Scooby's does right is the BMR and sedentary output. Put in any activity level other than that and you'll get ridiculous results.  ExRx is really the only one that fully 'works' as you can enter whatever level of exercise you're really doing and split the difference if your level of exercise is at the edge of two groups. For example I can enter 1.25 hours moderate and 1.25 hours light and I'll get 2500 (1940+550) which seems absolutely spot on.