Is 120 a good blood sugar?

A normal random blood sugar level hasn't been clearly defined. However, even if you've recently eaten and your blood sugar level is at its peak, your random blood sugar level shouldn't be higher than 200 mg/dL (11.1 mmol/L). Although no clear criteria have been established, a level higher than 140 mg/dL (7.8 mmol/L) but lower than 200 mg/dL (11.1 mmol/L), may indicate prediabetes. Your doctor may recommend additional testing. A level higher than 200 mg/dL (11.1 mmol/L) suggests either type 1 or type 2 diabetes. Remember, your blood sugar level alone isn't enough to differentiate between type 1 and type 2 diabetes. Your doctor may do other tests to determine which type of diabetes you have.