How this calculator works
One millimole of glucose has a mass of 180.1559 mg using the NIST molecular weight. A litre contains ten decilitres, giving 18.01559 mg/dL per mmol/L. Many clinical tables round this factor to 18, so their last decimal can differ slightly. Converting units does not change the sample type or determine whether a result is normal. The result is an estimate for information only and is not medical advice.
Formula
mg/dL = mmol/L x 18.01559. mmol/L = mg/dL / 18.01559.
Worked example
Glucose of 5 mmol/L converts to 90.07795 mg/dL. A value of 180.1559 mg/dL converts to 10 mmol/L.
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Frequently asked questions
Why do some charts use 18?
It is a convenient rounded factor. This page keeps the cited molecular weight through calculation.
Does this convert HbA1c?
No. HbA1c is a different measurement. Use the estimated average glucose calculator for the statistical A1c relationship.
Can I compare a whole-blood meter with a plasma result?
Unit conversion alone cannot account for sample type, calibration or timing. Check the laboratory or meter documentation.