BP & SugarBlood Sugar Unit Converter: mg/dL To mmol/L
Blood sugar is measured in mg/dL in the US and some other countries, and in mmol/L in most of Europe, Canada and Australia. Use this converter to switch instantly.
Glucose Converter
1 mmol/L = 18 mg/dL
The Formula
- mg/dL ÷ 18 = mmol/L
- mmol/L × 18 = mg/dL
The exact factor is 18.0182, based on the molecular weight of glucose.
Quick Reference Table
| mg/dL | mmol/L | Meaning |
|---|---|---|
| 54 | 3.0 | Very low |
| 70 | 3.9 | Low threshold |
| 100 | 5.6 | Upper normal fasting |
| 126 | 7.0 | Diabetes fasting threshold |
| 140 | 7.8 | 2 h after meal (normal limit) |
| 180 | 10.0 | Upper target range |
| 250 | 13.9 | Very high |
Use Either Unit In The App
In BP & Sugar you can log in mg/dL or mmol/L and switch at any time — all graphs and averages update automatically.
Then check what your numbers mean in Normal Blood Sugar Levels: Chart By Time Of Day.
Frequently Asked Questions
How do I convert mg/dL to mmol/L?
Divide by 18. For example, 126 mg/dL ÷ 18 = 7.0 mmol/L.
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This content is for information only and does not replace advice from your doctor. If you think you have very low or very high blood sugar, or a blood pressure above 180/120 mmHg with symptoms, seek medical help immediately.
Related Guides
Normal Blood Sugar Levels: Chart By Time Of Day
Normal blood sugar levels chart for fasting, before and after meals, in mg/dL and mmol/L, plus prediabetes and diabetes ranges and what A1C means.
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Low Blood Sugar: Symptoms, Causes And What To Do
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