About BloodGlucoseValue

Since 2019 BloodGlucoseValue has explained blood glucose readings in plain language. Enter a number and we show what it means fasting and after meals — for people without diabetes and for people managing diabetes — and what to do next.

Where the numbers come from

• Diagnostic cut-offs (people without diabetes): fasting plasma glucose normal below 100 mg/dL, prediabetes 100–125, diabetes 126 or more; 2-hour glucose tolerance test normal below 140, prediabetes 140–199, diabetes 200 or more; HbA1c 5.7–6.4% prediabetes, 6.5% or more diabetes — American Diabetes Association (ADA) Standards of Care, "Diagnosis and Classification".
• Treatment targets (people with diabetes): before meals 80–130 mg/dL, peak after meals below 180 mg/dL, HbA1c below 7% for many adults — ADA Standards of Care, "Glycemic Goals and Hypoglycemia".
• Hypoglycemia levels: level 1 = 54–69 mg/dL, level 2 = below 54 mg/dL, level 3 = a severe event needing help from another person (ADA / International Hypoglycaemia Study Group).
• Ketone check above 240 mg/dL for people with type 1 diabetes or on insulin — ADA patient guidance.
• HbA1c ↔ average glucose: ADAG study formula, estimated average glucose = 28.7 × HbA1c − 46.7.
• Units: 1 mmol/L glucose = 18.016 mg/dL.

How a reading is classified

Blood glucose depends on context, so every value page shows four views side by side: fasting and after a meal, each without and with diabetes. Integers up to 33 are shown as both mmol/L and mg/dL, because outside the US a reading of "7" almost always means 7 mmol/L.

What this site cannot do

One reading is a snapshot. It cannot diagnose diabetes, and it cannot replace the treatment plan agreed with your doctor or diabetes team — targets are individual, especially in pregnancy, for children and for older adults. Very low or very high blood sugar can be an emergency; if someone is confused, cannot swallow or is unconscious, call 911 (US) or your local emergency number.

Your privacy

The reading you enter is not stored by us: the checker simply opens the page for that value. Details in our privacy policy.

Who runs BloodGlucoseValue

BloodGlucoseValue is published by EPSILON WEBCRAFTS LLC, Lexington, KY 40507, USA, which also runs other plain-language health reference sites. Content is checked against the sources above; the last review was on 2026-10-25. Found an error? Tell us.