Blood glucose converter: mg/dL ↔ mmol/L
To turn mg/dL into mmol/L, divide by 18 (exactly 18.0182). To turn mmol/L into mg/dL, multiply by 18. So 100 mg/dL is 5.6 mmol/L, and 7.8 mmol/L is 140 mg/dL.
Common values
| mg/dL | mmol/L |
|---|---|
| 54 | 3.0 |
| 70 | 3.9 |
| 90 | 5.0 |
| 100 | 5.5 |
| 120 | 6.7 |
| 140 | 7.8 |
| 180 | 10.0 |
| 200 | 11.1 |
| 250 | 13.9 |
| 300 | 16.6 |
The lines a CGM report uses: 54 and 70 (low), 140 (top of the tighter band), 180 and 250 (high).
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How it is worked out
mmol/L = mg/dL ÷ 18.0182 mg/dL = mmol/L × 18.0182
The factor is glucose’s molar mass, 180.16 g/mol, over 10 (a decilitre is a tenth of a litre). Many reports round it to 18, which changes results by 0.1 at most. The US, and many Arab and Asian countries, use mg/dL; the UK, Canada, Australia and most of Europe use mmol/L.
Source
- Glucose molar mass 180.16 g/mol: 1 mmol/L = 18.0182 mg/dL.
Glucose tools
See it all from your export
The free CGM report reads the whole file: your 24-hour profile (AGP), time in range, GMI, variability, your biggest rises and overnight sensor pressure.
Open the free CGM reportQuestions people ask
- How do I convert mg/dL to mmol/L for blood glucose?
- Divide by 18. For example, 90 mg/dL ÷ 18 = 5.0 mmol/L, and 180 mg/dL = 10.0 mmol/L. To go back, multiply mmol/L by 18.
- Is the conversion the same for HbA1c?
- No. HbA1c is in % or mmol/mol, and those convert with a different formula: mmol/mol = (% − 2.15) × 10.929. Use the HbA1c ↔ average glucose calculator for it.
- Which countries use mg/dL and which use mmol/L?
- mg/dL is used in the United States, Saudi Arabia and much of the Gulf, Germany (alongside mmol/L), and many Asian countries. mmol/L is used in the UK, Canada, Australia and most of Europe. Your sensor app lets you switch.
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Information, not a diagnosis. HealthOS is a wellness product, not a medical device: these numbers can’t tell you whether anything needs treatment. Talk to a doctor about your results.