Why do you want to know this?? Normal sugar levels are levels up to 100 are and levels between 100 and 126 are considered pre-diabetes. I knew my dad's freind who died of stroke and his sugar level had shot up to 800 mg/dl...The effects of having a consistent high blood glucose level over 500mg can be devastating on the body which leading to complications such as heart disease and stroke, blindness, hypertension, diabetic neuropathy, nerve damage, depression, complications with feet, kidney disease and limb amputation.