The target fasting blood sugar level for diabetics age 20 and older is less than 100 milligrams per deciliter, according to WebMD. Before a meal, the target blood sugar level is 70 to 130 milligrams per deciliter.
One to two hours after a meal, the target blood sugar level is less than 180 milligrams per deciliter. For diabetics taking insulin, the target blood sugar level prior to exercise is at least 100 milligrams per deciliter, notes WebMD. At bedtime, blood sugar levels in diabetics should range from 100 to 140 milligrams per deciliter. The target A1c level for diabetics is 7 percent or less. Experts recommend that diabetics keep a log of blood sugar levels to gauge the effectiveness of treatment.