Instantly convert blood glucose levels between mg/dL (US) and mmol/L (UK/Canada/Australia). Includes HbA1c converter and reference chart.
| Category | Fasting mg/dL | Fasting mmol/L | HbA1c |
|---|---|---|---|
| Low (Hypoglycemia) | Below 70 | Below 3.9 | — |
| Normal | 70–99 | 3.9–5.5 | Below 5.7% |
| Prediabetes | 100–125 | 5.6–6.9 | 5.7–6.4% |
| Diabetes | 126+ | 7.0+ | 6.5%+ |
| Post-meal (2hr) Normal | Below 140 | Below 7.8 | — |
* Fasting values: no food for at least 8 hours. ADA guidelines for adults.
Both units measure the concentration of glucose in your blood, just using different measurement systems. The US, Germany, Japan, and France use mg/dL (milligrams per deciliter). Most other countries including the UK, Canada, Australia, and India use mmol/L (millimoles per liter).
The conversion factor is 18.016. To convert mg/dL to mmol/L, divide by 18. To convert mmol/L to mg/dL, multiply by 18.
Fasting blood sugar is measured after at least 8 hours without food. This is the standard diagnostic test for diabetes. A normal fasting level is 70–99 mg/dL (3.9–5.5 mmol/L).
Post-meal (postprandial) blood sugar peaks 1–2 hours after eating. Non-diabetics typically stay below 140 mg/dL (7.8 mmol/L) two hours after a meal.
HbA1c reflects your average blood sugar over the past 2–3 months and is the gold standard for diabetes management.