What is a good blood sugar number?

A good, fasting blood glucose level is 100 milligrams per deciliter, according to WebMD. Two hours after eating, the blood sugar level should be less than 140 milligrams per deciliter for people age 50 and under. For ages 50 to 60, it should be less that 150 milligrams per deciliter.

The blood glucose level two hours after a meal should be less than 160 milligrams per deciliter for people 60 and over, according to WebMD.

A good blood glucose level should be about 80 to 120 milligrams per deciliter just before a person eats or when they first wake up, explains WebMD. At bedtime, it should be between 100 and 140 milligrams per deciliter.