Blood Sugar Converter: Convert mmol/L to mg/dL and mg/dL to mmol/L

Written by Dr. Albana Greca, MD, MMedSc

Medically Reviewed by Dr. Ruden Cakoni, MD, Endocrinologist

Last updated: June 2026


Blood sugar results may be shown in two different units: mg/dL or mmol/L. This blood sugar converter helps you quickly convert glucose from mmol/L to mg/dL or from mg/dL to mmol/L.

After converting your number, remember that interpretation depends on when the test was taken, your symptoms, medications, pregnancy status, and your personal diabetes care plan.


Important medical note:
This page is for education only. It cannot diagnose diabetes, replace your doctor’s advice, or tell you what treatment to use. If your blood sugar is very high, very low, or you have concerning symptoms, seek medical advice promptly.

Questions about blood sugar ranges, charts, fasting levels, after-meal levels, and what your numbers may mean?

Have a question about blood sugar levels or diabetes charts?

This is the place to ask general questions about fasting blood sugar, after-meal blood sugar, HbA1c, normal ranges, high readings, low readings, and how to understand diabetes test results.

Your question may be reviewed and answered by Dr. Albana Greca, MD for educational purposes.

Please do not include private medical details, personal identification numbers, or urgent emergency symptoms.

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Blood Sugar Converter

Use the calculator below to convert your blood sugar result.

Convert mmol/L to mg/dL:    mg/dL = mmol/L × 18

Convert mg/dL to mmol/L:    mmol/L = mg/dL ÷ 18

Example:

7.0 mmol/L × 18 = 126 mg/dL

126 mg/dL ÷ 18 = 7.0 mmol/L


Blood Sugar Converter

Convert blood sugar from mg/dL to mmol/L or from mmol/L to mg/dL.

Formula: mmol/L = mg/dL ÷ 18. mg/dL = mmol/L × 18.

Educational only — this tool converts units but does not diagnose diabetes or replace medical advice.

Quick Conversion Table

Common Blood Sugar Conversions

Use this quick chart to convert blood sugar values between mmol/L and mg/dL.

mmol/L mg/dL
3.970
4.072
4.479
5.090
5.6101
6.0108
6.1110
7.0126
7.8140
8.0144
10.0180
11.1200
13.9250
16.7301
22.2400

These numbers are approximate because most blood sugar conversions are rounded. To convert mmol/L to mg/dL, multiply by 18. To convert mg/dL to mmol/L, divide by 18.

www.all-about-beating-diabetes.com

These numbers are approximate because most glucose conversions are rounded. For a quick estimate, multiply mmol/L by 18 to get mg/dL. Divide mg/dL by 18 to get mmol/L.

Why Are Blood Sugar Results Shown in Different Units?

Different countries use different measurement systems for blood sugar.

In the United States, blood sugar is usually reported as mg/dL.

In many other countries, including the United Kingdom, Canada, Australia, and many European countries, blood sugar is often reported as mmol/L.

Both units measure the same thing: the amount of glucose in your blood. The number looks different because the unit is different.


What Does My Converted Blood Sugar Number Mean?

A converted blood sugar number is only the first step. The meaning depends on timing.

Ask yourself:

  • Was this a fasting blood sugar?
  • Was it before a meal?
  • Was it 1 to 2 hours after eating?
  • Was it a random blood sugar?
  • Was I sick, stressed, or taking medication?
  • Am I pregnant?
  • Do I already have diabetes?
  • Am I using insulin or medicines that can cause low blood sugar?

The same number may mean different things in different situations.

For a more detailed guide by fasting, before meals, after meals, bedtime, and overnight readings, see: Blood Sugar Levels by Time of Day.

After converting your result, you may want to check whether your number is normal, low, or high. See: Is My Blood Sugar Normal? Blood Sugar Numbers Explained. 


Fasting Blood Sugar: General Guide

Fasting blood sugar is usually checked after you have not eaten or drunk anything with calories for at least 8 hours. This test shows your baseline blood glucose level, before food affects the result, and is commonly used to help screen for prediabetes, diabetes, or how well blood sugar is being managed.


Topic Patient-Friendly Explanation
Fasting Blood Sugar Fasting blood sugar is usually checked after you have not eaten or drunk anything with calories for at least 8 hours.
Why It Matters This test shows your baseline blood glucose level before food affects the result.
Common Use It is commonly used to help screen for prediabetes, diabetes, or to understand how well blood sugar is being managed.
www.all-about-beating-diabetes.com

To understand fasting numbers in more detail, see: Normal Fasting Blood Sugar Levels.

If you use insulin or medicines that can cause low blood sugar, ask your healthcare provider what to do when your blood sugar is low.

Seek urgent medical help if the person is confused, unconscious, having a seizure, unable to swallow safely, or not improving after treatment.


After-Meal Blood Sugar: General Guide

Blood sugar usually rises after eating. For many nonpregnant adults with diabetes, a common target is less than 180 mg/dL, or less than 10.0 mmol/L, about 1 to 2 hours after the start of a meal.

However, targets are not the same for everyone. Your doctor may recommend a different goal depending on your age, medications, pregnancy status, diabetes type, risk of low blood sugar, heart disease, kidney disease, or other medical conditions.


Low Blood Sugar: When to Be Careful

A blood sugar below 70 mg/dL, or below 3.9 mmol/L, is generally considered low blood sugar in people with diabetes.


Low blood sugar may cause:

  • Shaking
  • Sweating
  • Fast heartbeat
  • Hunger
  • Anxiety
  • Weakness
  • Dizziness
  • Confusion
  • Blurred vision

High Blood Sugar: When to Get Medical Help

High blood sugar can happen because of food, illness, infection, stress, missed medication, not enough insulin, dehydration, or other medical problems.

Contact your doctor if your blood sugar is repeatedly high or higher than your personal target range.

Seek urgent medical care if high blood sugar is associated with:

  • Vomiting
  • Severe weakness
  • Confusion
  • Dehydration
  • Rapid breathing
  • Abdominal pain
  • Fruity-smelling breath
  • Moderate or large ketones
  • Blood sugar staying very high despite your usual correction plan

If you have type 1 diabetes, are pregnant, or use insulin, ask your healthcare team when to check ketones and when to seek urgent care.


Important safety note

This calculator is for education only. It converts blood sugar units, but it does not diagnose diabetes, confirm whether your diabetes is controlled, or replace medical advice.

A blood sugar number should be interpreted based on:

  • whether the test was fasting, before a meal, after a meal, or random;
  • whether it came from a laboratory, glucose meter, or continuous glucose monitor;
  • your symptoms;
  • your diabetes history;
  • pregnancy, illness, medications, and your personal treatment plan.

Speak with your doctor if your readings are repeatedly high, unusually low, or very different from your usual pattern.

What People Are Mostly Asking About Blood Sugar Conversion

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

To convert blood glucose from mmol/L to mg/dL, multiply the mmol/L value by 18.

Example:

6.0 mmol/L × 18 = 108 mg/dL


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

To convert blood glucose from mg/dL to mmol/L, divide the mg/dL value by 18.

Example:

180 mg/dL ÷ 18 = 10.0 mmol/L


Is 7.0 mmol/L the same as 126 mg/dL?

Yes. 7.0 mmol/L is approximately equal to 126 mg/dL. This number is important because 7.0 mmol/L, or 126 mg/dL, is in the diabetes range when measured as fasting blood sugar, but diagnosis should be confirmed by a healthcare professional.

If your fasting blood sugar is between 127 and 200 mg/dL, read this detailed guide: Fasting Blood Sugar Level 127–200 mg/dL. 


Is 10.0 mmol/L high blood sugar?

10.0 mmol/L equals about 180 mg/dL.

Whether it is high depends on timing. For many nonpregnant adults with diabetes, less than 180 mg/dL about 1 to 2 hours after the start of a meal is a common target. But if 10.0 mmol/L is a fasting number, it is high and should be discussed with a doctor.


What is 5.6 mmol/L in mg/dL?

5.6 mmol/L is about 101 mg/dL.

If this is a fasting blood sugar, it falls near the beginning of the prediabetes range. One reading alone is not enough for diagnosis, but it is a reason to follow up with your doctor, especially if it happens more than once.


What is 6.1 mmol/L in mg/dL?

6.1 mmol/L is about 110 mg/dL.

If this is a fasting blood sugar, it is in the prediabetes range. Your doctor may recommend repeating the test, checking A1C, reviewing your weight, diet, activity level, sleep, medications, and family history.


What is 11.1 mmol/L in mg/dL?

11.1 mmol/L is about 200 mg/dL.

This number may be significant, especially if it is a random blood sugar with symptoms or a 2-hour oral glucose tolerance test result. Speak with a healthcare professional for proper interpretation.


Can this converter diagnose diabetes?

No. This converter only changes blood glucose values from one unit of measurement to another. It does not diagnose diabetes, prediabetes, gestational diabetes, hypoglycemia, or any other blood sugar disorder.

Diagnosis depends on proper medical testing, such as fasting plasma glucose, A1C, oral glucose tolerance test, or random plasma glucose in the right clinical situation.


Which unit is better, mg/dL or mmol/L?

Neither unit is better than the other. mg/dL and mmol/L are simply different systems for reporting blood glucose. The most important points are understanding what your result means, when the test was taken, and how the number compares with your personal blood sugar target recommended by your healthcare professional.


Why does my meter show mmol/L but my article shows mg/dL?

Your glucose meter may be set to the blood glucose unit commonly used in your country. Many websites in the United States report blood sugar in mg/dL, while many international meters and resources use mmol/L. This converter helps you compare results accurately by changing the number into the unit you need.


Should I change my medication based on this conversion?

No. Do not adjust insulin, diabetes tablets, or any other medication based only on a converted number from this page. Medication decisions should be guided by your overall pattern of blood sugar readings, symptoms, medical history, risk of low blood sugar, and the treatment plan recommended by your healthcare professional.


Final Take-Home Notes

When I explain blood sugar numbers to patients, I always remind them that one number is only one piece of the picture.

A fasting number, an after-meal number, and an A1C result each tell us something different. The goal is not only to convert the number correctly, but to understand what it means for your health and what safe next step is appropriate.

If your blood sugar is often outside your target range, do not panic, but do not ignore it. Write down your readings, note when you tested, what you ate, your medications, activity, sleep, illness, and symptoms. This makes it much easier for your doctor to help you safely.

A single blood sugar reading shows one moment in time. HbA1c gives a broader picture of your average blood sugar over about 2 to 3 months. Try the HbA1c to Average Blood Sugar Calculator.


Helpful next pages

Save This Blood Sugar Converter

If your glucose meter, lab report, or diabetes app uses a different unit than you are used to, this converter can help you understand your number quickly. Save this page, share it with someone who checks blood sugar, or pin the conversion chart for later.

Educational only — not personal medical advice. For diagnosis or treatment decisions, always speak with your doctor.

References

  • American Diabetes Association. Glucose calculator and diabetes education resources.
  • Centers for Disease Control and Prevention. Diabetes testing and blood sugar ranges.
  • American Diabetes Association. Standards of Care in Diabetes — Glycemic Targets.