How do I convert mmol/L to mg/dL?

Multiply the mmol/L value by 18.015 to get mg/dL. For example: 5.5 mmol/L × 18.015 = 99.1 mg/dL.

How do I convert mg/dL to mmol/L?

Divide the mg/dL value by 18.015 to get mmol/L. For example: 100 mg/dL ÷ 18.015 = 5.55 mmol/L.

Which countries use mmol/L?

The United Kingdom, Australia, Canada, most of Europe, and many other countries use mmol/L (millimoles per litre) to measure blood glucose.

Which countries use mg/dL?

The United States, and some countries in Asia, Latin America, and Eastern Europe use mg/dL (milligrams per decilitre) for blood glucose measurements.

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Blood Glucose Converter

Q: What is a normal blood glucose level?

A normal fasting blood glucose is 3.9–5.6 mmol/L (70–100 mg/dL). Two hours after a meal it should be below 7.8 mmol/L (140 mg/dL).

Instantly convert between mmol/L (used in the UK, Australia & Canada) and mg/dL (used in the USA & parts of Europe).

Enter value in mmol/L

mmol/L

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mg/dL

Formula: mmol/L × 18.015 = mg/dL

Reference Blood Glucose Ranges

Reading Type	mmol/L (UK/AU/CA)	mg/dL (US)	Indication
Fasting – Normal	3.9 – 5.6	70 – 100	Normal
Fasting – Pre-diabetes	5.6 – 6.9	101 – 125	Pre-diabetes
Fasting – Diabetes	≥ 7.0	≥ 126	Diabetes range
2hr Post-meal – Normal	< 7.8	< 140	Normal
2hr Post-meal – Pre-diabetes	7.8 – 11.0	140 – 199	Pre-diabetes
2hr Post-meal – Diabetes	≥ 11.1	≥ 200	Diabetes range
Hypoglycaemia	< 3.9	< 70	Low (Hypo)

⚠️ These are general reference values. Always consult your healthcare provider to understand your personal targets. Medical Disclaimer →

Frequently Asked Questions

Why are there two different units?

The USA uses milligrams per decilitre (mg/dL) while most other countries — including the UK, Australia, Canada, and most of Europe — use millimoles per litre (mmol/L). Both measure the same thing; they simply use different scales.

What is the exact conversion formula?

mmol/L to mg/dL: multiply by 18.015
mg/dL to mmol/L: divide by 18.015 (or multiply by 0.0555)
The factor 18.015 is the molecular weight of glucose.

Is this tool medically accurate?

Yes — we use the standard conversion factor of 18.015 (molecular weight of glucose), which is the same formula used by the NHS, ADA, and WHO. However, this tool is for educational use only and should not replace medical advice.

What is a normal blood glucose level?

For most adults, a healthy fasting glucose is 3.9–5.6 mmol/L (70–100 mg/dL). However, your doctor may set different targets based on your individual health status, age, and whether you have diabetes.