Useful. … I like it being a T2 diabetic using sliding scale, Humulin R . I always used 100 BG as a correction factor. But it all depends what ration am gonna used. At present my Correction ratio is : 1:20, while my Carbs ratio is 1:15 or sometimes 1:16 based on my experiment. Using this formula it’s quite good for me, but not perfect though, and I feel if I’m hypoglycemic.