Glucose — mmol/L to mg/dL

In short To convert blood glucose from mmol/L to mg/dL, multiply by 18.0156 — so one mmol/L is 18.0156 mg/dL, and one mg/dL is 0.0555074 mmol/L. 70 mg/dL is 3.9 mmol/L; 100 mg/dL is 5.6 mmol/L; 126 mg/dL is 7.0 mmol/L. The factor comes from the molar mass, because glucose has a molar mass of 180.156 g/mol; that is why it differs for every analyte and why a single "lab unit converter" factor does not exist. This is the single most converted number in medicine, because a glucose meter bought in one country reports in the other country's units and most meters cannot be switched. The rough mental version — divide mg/dL by 18 — is accurate to within half a percent and is what people actually use at the kitchen table; the exact divisor is 18.016. This converts units. It does not interpret results, does not compare your value against a reference interval, and is not a substitute for the clinician who ordered the test — reference intervals differ between laboratories, methods and populations.