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Blood Sugar Converter

Converter

Convert Blood Glucose

Input Unit

HbA1c & Estimated Average Glucose

HbA1c Input Unit

Result

6.99 mmol/L

Converted from 126 mg/dL

Clinical Range

Diabetic Range

Gauge scaled to 300 mg/dL (16.6 mmol/L)

Reference Ranges (mg/dL / mmol/L)

Categorymg/dLmmol/L
Hypoglycemic< 70< 3.9
Normal (fasting)70–993.9–5.5
Pre-diabetic100–1255.6–6.9
Diabetic126–2497.0–13.8
Very High≥ 250≥ 13.9

HbA1c Conversion

7 % (NGSP) = 53.0 mmol/mol (IFCC)

Estimated Average Glucose (eAG)

154.2 mg/dL / 8.6 mmol/L

For reference only
This tool does not provide medical advice. Always discuss your blood sugar and HbA1c results with a qualified healthcare professional.

About This Tool

Blood Sugar Converter – mg/dL to mmol/L and HbA1c Made Simple

The Blood Sugar Converter helps you translate glucose readings between the two units used around the world: mg/dL (milligrams per deciliter), the standard in the United States and Japan, and mmol/L(millimoles per liter), the SI unit used across Europe, Canada, Australia, and most international clinical guidelines. Whether you're reading a meter purchased abroad, interpreting a lab report from a different country, or simply double-checking a number from a doctor's visit, this tool gives you an instant, accurate conversion.

Why Two Units Exist

Blood glucose is fundamentally a concentration measurement, and different countries adopted different conventions decades ago. mg/dL expresses how many milligrams of glucose are dissolved per deciliter of blood, while mmol/L expresses the molar concentration directly. Neither unit is "more correct" — they simply reflect regional standards, and converting between them is purely arithmetic.

How the Conversion Works

Glucose has a fixed molar mass, which gives us an exact conversion factor of 18.0182. To convert mg/dL to mmol/L, divide by this factor; to go the other direction, multiply by it. For example, 180 mg/dL ÷ 18.0182 ≈ 9.99 mmol/L, and 5.5 mmol/L × 18.0182 ≈ 99.1 mg/dL. The converter performs this calculation instantly and lets you swap the input and output units with a single click.

Understanding the Clinical Range Indicator

Alongside the converted value, the tool displays a color-coded range label — hypoglycemic, normal, pre-diabetic, diabetic, or very high — based on commonly cited ADA and WHO threshold values for random or fasting glucose readings. A visual gauge bar fills proportionally to where your value sits within these ranges, giving you an at-a-glance sense of context alongside the precise number.

Reference only, not a diagnosis
These range labels are general educational reference points. They do not account for your individual medical history, medications, or testing conditions (fasting vs. post-meal). Always interpret results with guidance from a qualified healthcare professional.

Converting HbA1c Between NGSP and IFCC

Glycated hemoglobin (HbA1c) reflects average blood sugar control over roughly the previous two to three months and is reported differently depending on region. The US and many labs use the NGSP/DCCT percentage format (e.g. 7.0%), while many European laboratories report the IFCC mmol/mol value (e.g. 53 mmol/mol). The converter applies the standard linear formula IFCC = (NGSP − 2.15) × 10.929to move between the two, so you can compare an overseas lab result with the format you're used to.

Estimated Average Glucose (eAG)

Because an HbA1c percentage alone can be hard to relate to daily meter readings, the American Diabetes Association publishes a formula to translate it into an estimated average glucose value: eAG (mg/dL) = 28.7 × HbA1c% − 46.7. This tool calculates eAG automatically whenever you enter an HbA1c value, displaying the result in both mg/dL and mmol/L so you can see how your long-term average compares to your day-to-day readings.

Reading the Reference Range Table

Below your converted result, a reference table lists typical glucose ranges in both units side by side — from hypoglycemic levels under 70 mg/dL (3.9 mmol/L) through the diabetic range starting around 126 mg/dL (7.0 mmol/L). Keeping both units visible together makes it easier to build an intuitive sense of how the two scales relate, especially if you frequently switch between devices or guidelines that use different units.

Who Uses This Tool

Patients managing diabetes who travel internationally, caregivers tracking readings from family members abroad, healthcare professionals reviewing records from other countries, and students learning clinical chemistry all benefit from a fast, reliable way to move between glucose unit systems without manual arithmetic or risk of error.

Accuracy and Precision

All conversions use the internationally recognized exact factor of 18.0182 for glucose and the standard NGSP/IFCC linear relationship for HbA1c. You can adjust the displayed precision for glucose conversions from 0 to 4 decimal places to match the level of detail shown on your meter or lab report.

Frequently Asked Questions

Is the Blood Sugar Converter free?

Yes, Blood Sugar Converter is totally free :)

Can I use the Blood Sugar Converter offline?

Yes, you can install the webapp as PWA.

Is it safe to use Blood Sugar Converter?

Yes, any data related to Blood Sugar Converter only stored in your browser (if storage required). You can simply clear browser cache to clear all the stored data. We do not store any data on server.

How does the Blood Sugar Converter work?

Enter your glucose reading and select its unit (mg/dL or mmol/L). The tool applies the fixed scientific factor of 18.0182 to convert between the two units instantly. You can also convert HbA1c values between the NGSP percentage format and the IFCC mmol/mol format, and see the estimated average glucose (eAG) derived from HbA1c.

Why are there two different units for blood glucose?

The United States, Japan, and a few other countries report blood glucose in milligrams per deciliter (mg/dL), while most of Europe, Canada, Australia, and international clinical guidelines use millimoles per liter (mmol/L), the SI unit. This tool helps you interpret a reading regardless of which unit your meter, lab report, or doctor uses.

What is the formula used to convert mg/dL to mmol/L?

Divide the mg/dL value by 18.0182 to get mmol/L (for example, 180 mg/dL ÷ 18.0182 ≈ 9.99 mmol/L). To go the other way, multiply the mmol/L value by 18.0182 (5.5 mmol/L × 18.0182 ≈ 99.1 mg/dL).

What is estimated average glucose (eAG) and how is it calculated?

eAG translates an HbA1c percentage into an average daily glucose value using the ADA-published formula: eAG (mg/dL) = 28.7 × HbA1c% − 46.7. This gives patients a glucose-like number that's easier to relate to daily meter readings than the HbA1c percentage alone.

How accurate are the clinical range labels shown with my result?

The range labels (low, normal, pre-diabetic, diabetic, very high) are based on commonly cited ADA and WHO threshold values and are provided for general reference only. They are not a diagnosis — always interpret your results together with guidance from a qualified healthcare professional.

Can I convert HbA1c between % and mmol/mol here too?

Yes. The HbA1c section converts between the NGSP/DCCT percentage format common in the US and the IFCC mmol/mol format used in many European lab reports, using the standard linear formula: IFCC = (NGSP − 2.15) × 10.929.