Ideal cholesterol level is 100: 1) Target LDL cholesterol levels for adults with diabetes are <100 mg/dl (2.60 mmol/l); HDL cholesterol levels are >40 mg/dl (1.02 mmol/l); and triglyceride levels are <150 mg/dl (1.7 mmol/l) 2) https://www.healthline.com/health/high-cholesterol/treating-with-statins/guide-to-diabetes-and-high-cholesterol An LDL cholesterol level under 100 milligrams/deciliter (mg/dL) is considered ideal. 100–129 mg/dL is close to ideal. 130–159 mg/dL is borderline elevated.