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Blood Sugar Converter

Convert blood glucose between mmol/L and mg/dL with health range interpretation.

Complete Guide

Overview

Blood glucose is measured in mmol/L (UK, Australia, Canada) or mg/dL (USA). This converter helps patients and clinicians convert between these units and understand what the reading means.

How to Use

Select your input unit.

Enter the blood glucose value.

Click Calculate for conversion and health interpretation.

Formula & Calculation

1 mmol/L = 18 mg/dL
Normal fasting: 3.9–5.5 mmol/L (70–99 mg/dL)

Benefits of Using This Calculator

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Essential for Diabetics

Convert between units used in different countries.

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Global Use

Handles both international unit systems.

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Health Ranges

Color-coded health status interpretation.

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Instant Result

Real-time conversion.

In-Depth Guide

Blood Sugar Converter: mmol/L to mg/dL with Health Range Interpretation

Blood glucose is the same thing — measured in two different units depending on which country you are in. The UK, Australia, Canada, and most of Europe use mmol/L. The United States uses mg/dL. If you are managing diabetes or comparing readings from different sources, this converter gives you both units instantly — plus a health status interpretation of what your reading means.

The Conversion Formula

1 mmol/L = 18 mg/dL
mg/dL to mmol/L: Divide by 18
mmol/L to mg/dL: Multiply by 18

Worked Examples

7.0 mmol/L to mg/dL: 7.0 × 18 = 126 mg/dL

140 mg/dL to mmol/L: 140 ÷ 18 = 7.8 mmol/L

Convert instantly with our Blood Sugar Converter.

Blood Glucose Reference Ranges

Status	mmol/L	mg/dL
Severe Hypoglycemia	<2.8	<50
Low (Hypoglycemia)	2.8–4.0	50–72
Normal Fasting	3.9–5.5	70–99
Normal (2hrs post-meal)	Below 7.8	Below 140
Pre-Diabetic Fasting	5.6–6.9	100–125
Diabetic Fasting	7.0 and above	126 and above
Post-meal High Risk	Above 11.1	Above 200

Understanding Your Reading

A single blood glucose reading only tells you what your blood sugar is at that exact moment — it changes constantly based on meals, activity, stress, and illness. Context matters enormously:

Fasting reading (8+ hours without food): Most diagnostic. 5.6–6.9 mmol/L = pre-diabetes; 7.0+ = diabetes.
Post-meal reading (2 hours after eating): Should return below 7.8 mmol/L in healthy adults. Higher values indicate impaired glucose tolerance.
Random reading: 11.1 mmol/L or above with diabetes symptoms is a diagnostic criterion for diabetes.

Why This Conversion Matters

International patients. Moving between countries means your home monitor may use different units than your new doctor's lab reference ranges.
Reading research. Clinical studies use different units — converting helps you interpret findings accurately.
Online glucose monitoring communities. Diabetes forums and CGM platforms may display readings in either unit.
CGM interpretation. Continuous glucose monitoring devices may show readings in whichever unit you are unfamiliar with.

Hypoglycemia: When to Act Fast

Blood glucose below 3.9 mmol/L (70 mg/dL) is hypoglycemia. Below 3.0 mmol/L (54 mg/dL) requires immediate treatment:

Follow the Rule of 15: Take 15g of fast-acting carbohydrate (glucose tablets, fruit juice, or regular soda — not diet). Wait 15 minutes. Re-test. If still low, repeat. Once above 4.0 mmol/L, eat a small snack if the next meal is more than an hour away.

Final Thoughts

Blood glucose unit conversion is an essential skill for anyone managing diabetes or researching blood sugar health. The converter above handles the math instantly — the interpretation table gives you context for what any number actually means.

Convert your blood sugar reading with our free Blood Sugar Converter.

This tool is for educational and informational purposes. Consult your doctor or diabetes care team for personalised blood glucose management.