Blood Sugar Level Checker
Enter one glucose reading and see in seconds whether it falls in the normal, prediabetes or diabetes range for that type of test. It is free, instant and nothing you enter is stored.
This tool is for education only. It is not a diagnosis or a treatment plan. Never stop or change a prescribed medicine without your doctor. Nothing you enter is stored or sent anywhere.
Normal blood sugar ranges
These are the ranges doctors use for adults without a diabetes diagnosis, following the American Diabetes Association Standards of Care, which Indian (ICMR) guidance also uses. Values are in mg/dL; multiply mmol/L by 18.016 to convert.
| Test | Low | Normal | Prediabetes range | Diabetes range |
|---|---|---|---|---|
| Fasting (8+ hours, no food) | Under 70 | 70 to 99 | 100 to 125 | 126 or more |
| 2 hours after a meal (PPBS) | Under 70 | Under 140 | 140 to 199 | 200 or more |
| Random (any time) | Under 70 | Under 140 | 140 to 199 (higher than usual) | 200 or more |
If you already have diabetes
Diagnostic ranges do not apply. Many doctors use treatment targets instead: fasting 80 to 130 mg/dL and under 180 mg/dL two hours after a meal. Your own target is set by your doctor.
How to test fasting and PPBS correctly
- Fasting means no food or drink except water for at least 8 hours, usually first thing in the morning.
- PPBS (post-prandial blood sugar) is measured exactly 2 hours after you start eating, not after you finish.
- Wash and dry your hands before a finger-prick; sugary residue on the skin gives a falsely high reading.
- Use the strips that match your meter and check the expiry date.
How this checker works
It converts mmol/L to mg/dL if needed, compares your reading with the table above for the type of test you picked, and shows where it falls on a scale. Readings under 54 mg/dL, or under 70 if you have diabetes, and readings of 300 mg/dL or more show a safety message first.
Common questions
Two hours after a meal, a reading under 140 mg/dL (7.8 mmol/L) is normal for adults without diabetes. People with diabetes are often advised to stay under 180 mg/dL.
A fasting reading of 100 to 125 mg/dL is called the prediabetes range, so 110 is above normal. One reading is not a diagnosis; ask your doctor about a repeat fasting test or an HbA1c.
For adults without diabetes, a fasting sugar of 70 to 99 mg/dL (3.9 to 5.5 mmol/L) is normal.
No. Stress, illness, poor sleep or a meal you forgot about can all raise a single reading. Diabetes is confirmed with repeat tests.
Under 54 mg/dL is low: take 15 g of fast sugar and recheck in 15 minutes. At 300 mg/dL or more, contact your doctor today and seek emergency care if you have vomiting, heavy breathing or drowsiness.
They answer different questions. Fasting sugar is a snapshot; HbA1c shows your average over about three months. See the HbA1c calculator to convert between HbA1c and average sugar.