Blood Sugar Converter

Convert blood glucose between mg/dL and mmol/L and see where a reading falls.

I have	mg/dL
Glucose reading	108
Taken	Fasting

I have

Glucose reading

Taken

mmol/L

108 mg/dL = 6 mmol/L. Prediabetes range (fasting 100–125). A diagnosis needs lab tests repeated on different days.

108 mg/dL

LowNormalPrediabetesDiabetes range

About the Blood Sugar Converter

The US reports glucose in mg/dL; the UK, Canada, Australia and most of the world use mmol/L. Glucose's molar mass (180.16 g/mol) gives 1 mmol/L = 18.016 mg/dL. The American Diabetes Association uses fasting values of under 100 mg/dL (5.6 mmol/L) as normal, 100–125 as prediabetes and 126+ as diabetes; for the 2-hour glucose test, under 140, 140–199 and 200+.

The formula

mg/dL = mmol/L × 18.016

Worked example

Example: mmol/L = 6.7

Inputs: I have: mg/dL; Glucose reading: 120; Taken: Fasting.
Formula: mg/dL = mmol/L × 18.016
Result: mmol/L = 6.7

Things to keep in mind

Not a diagnosis. Targets for people with diabetes differ and are set with their care team.

Questions people ask

What about HbA1c?

Use the A1C calculator to convert A1C to average glucose.

Is 18 close enough?

Yes for everyday use; 18.016 is the exact factor.