Blood glucose readings are given in mmol/L in most countries and mg/dL in the US — this converts between the two.
How it works
Multiplying mmol/L by 18.0182 (glucose’s molar mass adjusted for the dL/L unit difference) gives mg/dL; dividing mg/dL by that same constant gives mmol/L back.
What this does not include
This does not include interpreting whether a reading is in a healthy range — always follow guidance from a healthcare provider for interpreting blood glucose results.
How to use this calculator
- Enter a value in either mmol/L or mg/dL — the other field fills in automatically.
Frequently asked questions
Why does this conversion use glucose’s molar mass?
Because mmol/L measures a molar concentration while mg/dL measures a mass concentration — converting between them requires glucose’s specific molar mass, unlike a simple fixed-ratio unit conversion.
Which countries use mmol/L vs mg/dL?
Most of the world uses mmol/L for blood glucose; the United States (along with a few other countries) conventionally uses mg/dL.
Is this conversion specific to glucose?
Yes — the 18.0182 factor is derived specifically from glucose’s molecular weight and would be different for converting other substances between molar and mass concentration.
