Blood sugar converter: mmol/L, mg/dL and g/L
Enter a value and see it straight away in the two other units. Handy when your meter, your lab and your doctor do not use the same unit.
Convert a value
Unit of your value
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Conversion result
99mg/dL
Calculation: 5.5 × 18.016 = 99
0.99g/L
Calculation: 5.5 × 18.016 ÷ 100 = 0.99
99 mg/dL, 0.99 g/L
Where these calculations come from
- mmol/L and mg/dL: 1 mmol/L = 18.016 mg/dL, from the molar mass of glucose (180.16 g/mol) (PubChem, National Library of Medicine)
- g/L and mg/dL: 1 g/L = 100 mg/dL, a plain change of unit
Applidia does not invent any formula: we apply these published references as they are.
The maths runs in your browser. This does not replace the advice of your doctor or diabetes care team.
Conversion table of common values
| mmol/L | mg/dL | g/L |
|---|---|---|
| 3.0 | 54 | 0.54 |
| 3.9 | 70 | 0.70 |
| 5.0 | 90 | 0.90 |
| 5.5 | 99 | 0.99 |
| 6.0 | 108 | 1.08 |
| 7.0 | 126 | 1.26 |
| 7.8 | 141 | 1.41 |
| 10.0 | 180 | 1.80 |
| 11.1 | 200 | 2.00 |
| 13.9 | 250 | 2.50 |
| 16.7 | 301 | 3.01 |
Values calculated with 1 mmol/L = 18.016 mg/dL (molar mass of glucose, PubChem).
From mg/dL
| mg/dL | mmol/L | g/L |
|---|---|---|
| 54 | 3.0 | 0.54 |
| 70 | 3.9 | 0.70 |
| 80 | 4.4 | 0.80 |
| 100 | 5.6 | 1.00 |
| 110 | 6.1 | 1.10 |
| 126 | 7.0 | 1.26 |
| 140 | 7.8 | 1.40 |
| 180 | 10.0 | 1.80 |
| 200 | 11.1 | 2.00 |
| 250 | 13.9 | 2.50 |
| 300 | 16.7 | 3.00 |
Which unit is used where?
- United KingdomSource: NHS
- mmol/L
- SwitzerlandSource: Diabetes Schweiz
- mmol/L
- United StatesSource: American Diabetes Association
- mg/dL
- CanadaSource: Diabetes Canada
- mmol/L
- GermanySource: diabetesDE, Deutsche Diabetes-Hilfe
- mg/dL, mmol/L
- ItalySource: Istituto Superiore di Sanità (EpiCentro)
- mg/dL
Reference values
| Landmark | mmol/L | mg/dL |
|---|---|---|
| Level 2 hypoglycaemiaADA | < 3.0 | < 54 |
| Level 1 hypoglycaemia (alert value)ADA | < 3.9 | < 70 |
| Target range in sensor reports (time in range)Battelino 2019 | 3.9–10.0 | 70–180 |
| Fasting: diagnostic threshold for diabetesWHO, ADA | ≥ 7.0 | ≥ 126 |
| 2 hours into a glucose tolerance test (OGTT): diagnostic threshold for diabetesWHO, ADA | ≥ 11.1 | ≥ 200 |
These are published thresholds, given as landmarks: your personal targets are set with your care team. Diabetes is diagnosed by a lab on a blood sample, never on a single finger-prick reading.
Sources (6)
- National Library of Medicine. PubChem Compound Summary: Glucose (CID 5793). Molecular weight 180.16 g/mol. pubchem.ncbi.nlm.nih.gov/compound/Glucose
- American Diabetes Association Professional Practice Committee. 2. Diagnosis and Classification of Diabetes: Standards of Care in Diabetes 2026. Diabetes Care 2026;49(Suppl. 1):S27–S49. doi.org/10.2337/dc26-S002
- American Diabetes Association Professional Practice Committee. 6. Glycemic Goals, Hypoglycemia, and Hyperglycemic Crises: Standards of Care in Diabetes 2026. Diabetes Care 2026;49(Suppl. 1):S132–S149. doi.org/10.2337/dc26-S006
- Battelino T. et al. Clinical Targets for Continuous Glucose Monitoring Data Interpretation: Recommendations From the International Consensus on Time in Range. Diabetes Care 2019;42:1593–1603. doi.org/10.2337/dci19-0028
- World Health Organization. Definition and diagnosis of diabetes mellitus and intermediate hyperglycaemia. Geneva, 2006.
- ISO 15197:2013. In vitro diagnostic test systems: requirements for blood-glucose monitoring systems for self-testing in managing diabetes mellitus.
Frequently asked questions
How do I convert mmol/L to mg/dL?
Multiply by 18.016 (often rounded to 18), because one mole of glucose weighs 180.16 g. Example: 7 mmol/L × 18.016 = 126 mg/dL. To go back, divide by 18.016. g/L, used mainly in France, is mg/dL divided by 100.
How do I know which unit my reading is in?
The unit is usually printed next to the number, on your meter’s screen and on the lab report. If in doubt, ask your pharmacist or your care team.
Why do my meter and the lab give slightly different numbers?
A meter measures a drop of capillary blood, the lab measures venous plasma. The ISO 15197 standard allows ± 15 mg/dL (0.83 mmol/L) below 100 mg/dL and ± 15% above it, for 95% of readings.
