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The Blood Sugar Unit Converter translates blood glucose readings between mg/dL (United States, used in clinical reports, glucose meters, and lab work) and mmol/L (United Kingdom, European Union, Australia, Canada — the SI standard). Conversion factor: divide mg/dL by 18.0182 to get mmol/L, or multiply mmol/L by 18.0182 to get mg/dL. The number 18.0182 reflects the molecular weight of glucose (180.16 g/mol) divided by 10. Clinical ranges are unit-specific. A fasting glucose of 100 mg/dL converts to 5.6 mmol/L — both represent the same biological state (top of normal fasting range, approaching prediabetes at 100+ mg/dL or 5.6+ mmol/L per ADA criteria). Postprandial (after-meal) ranges differ from fasting: normal under 140 mg/dL (7.8 mmol/L) two hours after eating; diabetes diagnosed at sustained 200+ mg/dL (11.1 mmol/L). The calculator outputs not just the converted number but a clinical category (Hypoglycemia, Normal, Prediabetes, Diabetes) based on whether you specify fasting or postprandial context. Hypoglycemia is defined as below 70 mg/dL (3.9 mmol/L) regardless of timing — a medical emergency requiring immediate sugar intake. These thresholds follow American Diabetes Association (ADA), American Association of Clinical Endocrinologists (AACE), and WHO criteria. Who needs this converter: International diabetics travelling between regions, patients reviewing lab results from foreign systems, families with multinational members comparing readings, healthcare professionals working across reference standards, researchers reading international literature, and continuous glucose monitor (CGM) users whose devices may default to a non-local unit. Always consult your healthcare provider for treatment decisions — this calculator provides only the mechanical unit conversion plus reference ranges.

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1. 1Step 1 — Enter your blood glucose reading from your meter, CGM, or lab report
2. 2Step 2 — Select the source unit (mg/dL for US devices, mmol/L for UK/EU/AU/CA devices)
3. 3Step 3 — Select the measurement context (fasting after 8+ hours, or postprandial 1–2 hours after eating)
4. 4Step 4 — Calculator divides mg/dL by 18.0182 or multiplies mmol/L by 18.0182 to convert
5. 5Step 5 — Output displays both units simultaneously for easy reference
6. 6Step 6 — Clinical category appears (Hypoglycemia / Normal / Prediabetes / Diabetes range) based on ADA criteria
7. 7Step 7 — Use the converted value to communicate with international healthcare providers or compare against locally-published ranges

• !Confusing fasting and postprandial reference ranges (postprandial allows higher values up to 140 mg/dL)
• !Applying the same conversion factor to ketones or other blood markers (each has its own molecular weight)
• !Treating a single elevated reading as diabetes — diagnosis requires repeat fasting glucose or HbA1c confirmation
• !Forgetting that test strips and CGM readings can be ±15% from venous blood draws — minor variation is normal
• !Adjusting medication doses based on calculator output without consulting your healthcare provider