Blood glucose comes in two units, mg/dL in the United States and mmol/L nearly everywhere else. Divide by 18 or multiply by 18 and the two worlds understand each other.
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The eighteen fold bridge
Glucose has a molecular weight of about 180 grams per mole, which collapses neatly into the conversion factor everyone memorizes. One mmol/L equals 18 mg/dL. A fasting value of 100 mg/dL in Chicago is 5.6 mmol/L in London, the same blood describing the same morning. The factor is exact enough for every clinical purpose, and meters sold internationally often switch between the two in their settings menu.
Where each unit lives
The United States, Japan, and a handful of other countries report in mg/dL. The United Kingdom, Canada, Australia, most of Europe, and China report in mmol/L. Research papers follow their home convention, and multinational trials often print both. Patients who move, travel, or read foreign guidance online meet the other unit sooner or later, usually at the least convenient moment.
Thresholds worth knowing in both
A few landmarks anchor safe reading in either dialect. Hypoglycemia territory begins near 70 mg/dL or 3.9 mmol/L. Fasting diabetes diagnosis starts at 126 mg/dL or 7.0 mmol/L. A common post meal target sits at 180 mg/dL or 10 mmol/L. Knowing these six numbers by heart covers most urgent conversions without any calculator at all.
Mix ups happen
Unit confusion between mg/dL and mmol/L has caused real dosing errors, which is why modern meters lock the unit at purchase in many countries. If a reading ever looks wildly wrong, check the unit flag on the screen before acting on it. This converter exists precisely for those moments when the number looks impossible until you divide by 18.