Glucose Unit Converter (mg/dL ↔ mmol/L)
Convert glucose between mg/dL and mmol/L in either direction. Enter a value and the result updates instantly. This page performs unit conversion and cites where the factor and the reference intervals come from; it does not interpret your value.
The glucose conversion factor and where it comes from
Glucose is the simple sugar that circulates in blood; fasting glucose is reported on routine metabolic panels. Glucose is reported in mg/dL on U.S., Japanese, and some German reports, and in mmol/L on UK, Canadian, Australian, and most European reports.
The standard conversion factor for glucose is 0.05551, applied as mg/dL × 0.05551 = mmol/L (and mmol/L ÷ 0.05551 = mg/dL in reverse). Glucose has a molecular weight of 180.16 g/mol, giving the familiar factor 0.05551 (often written as dividing by 18 for the reverse direction). Source: AMA Manual of Style / UK Kidney Association SI conversion table.
Published reference intervals
The intervals below are reproduced from U.S. National Library of Medicine, MedlinePlus: Blood glucose test. They are listed here for unit reference only. Whether any value is in range for you depends on your laboratory's own reference range and your clinical context, so read them alongside your report and your healthcare provider, not in place of either.
| Category | mg/dL | mmol/L |
|---|---|---|
| Normal fasting | Less than 100 mg/dL | Less than 5.6 mmol/L |
| Prediabetes (fasting) | 100-125 mg/dL | 5.6-6.9 mmol/L |
| Diabetes (fasting) | 126 mg/dL and above | 7.0 mmol/L and above |
These are ADA fasting-glucose diagnostic categories published by the source; a single result is normally confirmed before any diagnosis.
Pre-computed glucose conversions
Dedicated answer pages for the glucose values people search for most. Each shows the answer, the math, and a table of nearby values.
mg/dL to mmol/L
Common questions
How do I convert glucose from mg/dL to mmol/L?
Multiply by 0.05551: mg/dL × 0.05551 = mmol/L. To go the other way, divide by 0.05551 (or multiply by 18.02).
What is the glucose conversion factor?
0.05551. Glucose has a molecular weight of 180.16 g/mol, giving the familiar factor 0.05551 (often written as dividing by 18 for the reverse direction).
Where is mg/dL used and where is mmol/L used?
Glucose is reported in mg/dL on U.S., Japanese, and some German reports, and in mmol/L on UK, Canadian, Australian, and most European reports.
Related converters and reference
- Full blood test unit converter: 60+ biomarkers, any value, either direction.
- nmol/L to mg/dL by substance: the molar-to-mass conversion depends on which substance you measured.
- Glucose reference page: what the test measures.
- HbA1c to average glucose (eAG) converter.
Track glucose over time, in either unit system
Health3 imports lab values, converts units automatically, and charts the trend. Free.