mmol/L to mg/dL Converter
Convert blood glucose readings between mmol/L and mg/dL. Type a value in either box and the other updates instantly. This is a unit conversion only — it does not tell you what a reading means.
5.5 mmol/L = 99 mg/dL
Type in either field and the other updates instantly. Results are rounded to one decimal place for mmol/L and to the nearest whole number for mg/dL. This is a unit conversion only; it does not interpret the value.
The glucose conversion formula
mmol/L → mg/dL
mg/dL = mmol/L × 18.0182
Example: 5.5 mmol/L × 18.0182 = 99 mg/dL.
mg/dL → mmol/L
mmol/L = mg/dL ÷ 18.0182
Example: 126 mg/dL ÷ 18.0182 = 7.0 mmol/L.
Both units describe the same thing — the concentration of glucose in blood. mg/dL is a mass concentration (milligrams of glucose per decilitre), while mmol/L is a molar concentration (millimoles of glucose per litre). Because the molar mass of glucose is about 180.18 g/mol, one mmol/L equals 18.0182 mg/dL. Many quick tables round this to 18, which is why you may see 100 mg/dL listed as either 5.5 or 5.6 mmol/L.
Quick reference conversion table
Values are rounded the same way as the converter above. The table is a lookup aid, not a guide to target ranges.
| mmol/L | mg/dL |
|---|---|
| 2.0 | 36 |
| 3.0 | 54 |
| 4.0 | 72 |
| 5.0 | 90 |
| 6.0 | 108 |
| 7.0 | 126 |
| 8.0 | 144 |
| 9.0 | 162 |
| 10.0 | 180 |
| 11.0 | 198 |
| 12.0 | 216 |
| 13.0 | 234 |
| 14.0 | 252 |
| 15.0 | 270 |
| 16.0 | 288 |
| 18.0 | 324 |
| 20.0 | 360 |
| 25.0 | 450 |
| 30.0 | 541 |
| mg/dL | mmol/L |
|---|---|
| 40 | 2.2 |
| 50 | 2.8 |
| 60 | 3.3 |
| 70 | 3.9 |
| 80 | 4.4 |
| 90 | 5.0 |
| 100 | 5.5 |
| 110 | 6.1 |
| 120 | 6.7 |
| 130 | 7.2 |
| 140 | 7.8 |
| 150 | 8.3 |
| 160 | 8.9 |
| 180 | 10.0 |
| 200 | 11.1 |
| 250 | 13.9 |
| 300 | 16.6 |
| 400 | 22.2 |
| 500 | 27.7 |
Log the reading instead of just converting it
DiabetLog records your glucose readings with the time and meal context, shows trends on charts, reminds you to test and creates PDF reports for doctor visits. Free to download; your data stays on your device.
Glucose unit conversion FAQ
How do I convert mmol/L to mg/dL?
Multiply the mmol/L value by 18.0182 (often rounded to 18). For example, 5.5 mmol/L × 18.0182 ≈ 99 mg/dL.
How do I convert mg/dL to mmol/L?
Divide the mg/dL value by 18.0182 (often rounded to 18). For example, 126 mg/dL ÷ 18.0182 ≈ 7.0 mmol/L.
Why is the conversion factor 18?
Glucose has a molar mass of about 180.18 grams per mole. One millimole per litre is therefore 180.18 milligrams per litre, or 18.018 milligrams per decilitre, which is why the factor is 18.0182 — commonly rounded to 18 for quick mental maths.
Which countries use mmol/L and which use mg/dL?
mg/dL is used in the United States and in some other countries, while mmol/L is used in the United Kingdom, Canada, Australia and much of Europe and Asia. Meters, CGMs and lab reports follow the local convention, which is why a converter is useful when reading material from another country.
Does this converter tell me whether my blood sugar is normal?
No. It only changes the unit a number is written in; it does not interpret the value. What counts as a normal or target reading depends on your situation and is something to discuss with your doctor or diabetes educator.
Is there an app that can log my glucose readings for me?
DiabetLog is a free blood sugar tracker app for iPhone, iPad and Android that logs your readings, shows charts and trends, and creates PDF reports for doctor visits. Your data stays on your device.