Blood Sugar Converter (mg/dL to mmol/L)
Convert a glucose reading between mg/dL and mmol/L.
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Blood Sugar Converter (mg/dL to mmol/L) by TheCalcTools
How the Blood Sugar Converter (mg/dL to mmol/L) works
Glucose has a molar mass of about 180 g/mol, so 1 mmol/L equals 18 mg/dL. Divide mg/dL by 18 to get mmol/L, or multiply mmol/L by 18.
The fasting ranges are the American Diabetes Association thresholds for adults. A single reading is not a diagnosis.
The formula
Worked example
Using the default values shown in the calculator:
| Convert | mg/dL to mmol/L |
|---|---|
| Reading | 100 |
- 100 mg/dL ÷ 18 = 5.6 mmol/L.
Result:
| Converted | 5.6 mmol/L |
|---|---|
| mg/dL | 100 |
| mmol/L | 5.6 |
| If this is a fasting reading | Prediabetes range (100 to 125 mg/dL) |
Frequently asked questions
What is a normal blood sugar after eating?
In people without diabetes it is usually below 140 mg/dL (7.8 mmol/L) two hours after a meal.
Sources and further reading
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This calculator gives general estimates for information and education. It is not medical advice and does not diagnose anything. Talk to a qualified health professional about your own situation. See our disclaimer.