Glucose Unit Converter (mg/dL ↔ mmol/L)
Convert blood glucose between US (mg/dL) and international (mmol/L) units, with category.
What this calculates
Blood glucose is reported in two units worldwide: mg/dL (US, parts of Asia) and mmol/L (Europe, Canada, Australia). The conversion factor is 18.0182. This calculator converts both directions and shows the ADA category for fasting glucose.
Formula & how it works
mg/dL → mmol/L: divide by 18.0182. mmol/L → mg/dL: multiply by 18.0182. ADA fasting: <100 mg/dL (5.6) normal; 100-125 (5.6-6.9) prediabetes; ≥126 (7.0) diabetes.
Worked example
126 mg/dL = 7.0 mmol/L → diabetic-range fasting.
Frequently asked questions
Fasting vs random?
Fasting = ≥8 hours no food. Random/postprandial readings have different cutoffs (200+ mg/dL random or 2-hr post-meal suggests diabetes).
HbA1c?
Different metric — % glycated hemoglobin, reflects 3-month average. <5.7% normal, 5.7-6.4% pre, ≥6.5% diabetes.
CGM trends?
Continuous glucose monitors report in your local unit and produce time-in-range metrics, which are increasingly used over A1c alone.
Disclaimer: Educational only — confirm category with a clinician.