Blood Sugar Converter & Checker
Blood sugar is interpreted differently depending on WHEN it was measured — fasting and after-eating readings use different reference ranges. This converts between mg/dL and mmol/L and checks your value against the correct range for the test type you select.
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How this works
Conversion: mmol/L = mg/dL ÷ 18.0182, and mg/dL = mmol/L × 18.0182. Classification follows American Diabetes Association (ADA) diagnostic criteria, which use different thresholds depending on test type. Fasting Plasma Glucose: Normal <100 mg/dL (<5.6 mmol/L), Prediabetes 100–125 mg/dL (5.6–6.9 mmol/L), Diabetes range ≥126 mg/dL (≥7.0 mmol/L). After Eating (2-hour post-meal / OGTT): Normal <140 mg/dL (<7.8 mmol/L), Prediabetes 140–199 mg/dL (7.8–11.0 mmol/L), Diabetes range ≥200 mg/dL (≥11.1 mmol/L). Random reading: below 140 mg/dL is generally reassuring, 140–199 mg/dL is borderline and worth following up with a fasting or HbA1c test, and 200 mg/dL or above is in the diabetes range if you also have classic symptoms (excess thirst, frequent urination, unexplained weight loss) — a random reading alone, without symptoms, is never diagnostic on its own.
Medical disclaimer
This tool provides general health information based on published formulas and guidelines. It is not a medical diagnosis and does not replace advice from a qualified doctor. If you have a health concern, please consult a physician or book a consultation on IMCURE.
Frequently asked questions
Which unit is used in India?
Most Indian labs and glucometers report in mg/dL, while many European countries use mmol/L.
Does one high reading mean I have diabetes?
No. ADA guidelines require an abnormal result confirmed on a second, separate day (or a second test method like HbA1c) before diagnosing diabetes — a single reading, especially a random one, is a prompt to get properly tested, not a diagnosis.
What counts as "after eating" for this tool?
Clinically this means exactly 2 hours after the start of a meal (or a standardised 75g glucose drink in a lab OGTT test) — checking earlier or later than 2 hours can give a misleadingly high or low reading.
