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Blood Sugar Converter

Convert blood sugar levels between mg/dL (US) and mmol/L (UK/International) with instant results, diabetes risk assessment, visual range indicators, and comprehensive glucose reference charts.

Blood Sugar Converter

Convert between mg/dL and mmol/L instantly

Quick Values (mg/dL):
70Normal Low 100Pre-diabetes 126Diabetes 5.5mmol/L 7.0mmol/L 10mmol/L

Embed Blood Sugar Converter Widget

About Blood Sugar Converter

Welcome to the Blood Sugar Converter, your comprehensive tool for converting blood glucose levels between mg/dL (milligrams per deciliter) and mmol/L (millimoles per liter). Whether you are managing diabetes, interpreting lab results, or traveling between countries with different measurement standards, this converter provides instant, accurate conversions with helpful health context.

Understanding Blood Sugar Units

Blood sugar (glucose) levels can be measured in two different units depending on your location:

The Conversion Formula

Blood Sugar Conversion
mmol/L = mg/dL ÷ 18.0182
mg/dL = mmol/L × 18.0182

The conversion factor 18.0182 is derived from the molecular weight of glucose (180.16 g/mol) divided by 10. For quick mental math, many people simply use 18 as an approximation.

Blood Sugar Ranges and Health Categories

Understanding where your blood sugar falls on the health spectrum is crucial for managing your health. Here are the standard fasting blood glucose ranges:

Category mg/dL Range mmol/L Range Health Indication
Severe Hypoglycemia < 54 < 3.0 Medical emergency - seek help immediately
Hypoglycemia 54 - 69 3.0 - 3.8 Low blood sugar - consume fast-acting carbs
Normal 70 - 99 3.9 - 5.5 Healthy fasting blood sugar range
Prediabetes 100 - 125 5.6 - 6.9 Elevated - lifestyle changes recommended
Diabetes 126 - 179 7.0 - 9.9 Diagnostic threshold for diabetes
High 180 - 249 10.0 - 13.8 High - requires monitoring and management
Very High ≥ 250 ≥ 13.9 Very high - seek medical attention
⚠️
Important: These ranges are general guidelines for fasting blood glucose. Post-meal readings are typically higher. Always consult your healthcare provider for personalized targets and medical advice.

How to Use This Converter

  1. Enter your value: Type your blood sugar reading into the input field. The converter accepts various number formats including decimals.
  2. Select direction: Choose whether to convert from mg/dL to mmol/L or vice versa.
  3. Set precision: Select how many decimal places you want in your result.
  4. View results: Click Convert to see your converted value along with a visual indicator showing where your level falls on the glucose health spectrum.

Quick Reference Conversions

mg/dL mmol/L Category
703.9Normal (lower)
804.4Normal
905.0Normal
1005.6Prediabetes threshold
1106.1Prediabetes
1206.7Prediabetes
1267.0Diabetes threshold
1407.8Diabetes
18010.0High
20011.1High

Why Different Countries Use Different Units

The difference in blood sugar measurement units is largely historical. The United States adopted the mass concentration method (mg/dL) early in medical practice. When the International System of Units (SI) was developed, most countries transitioned to molar concentration (mmol/L) for standardization. However, some countries, particularly the US, continued using mg/dL due to established medical infrastructure and familiarity.

Tips for Managing Blood Sugar

Frequently Asked Questions

What is the difference between mg/dL and mmol/L?

mg/dL (milligrams per deciliter) is the blood sugar measurement unit used in the United States, while mmol/L (millimoles per liter) is used in the UK, Canada, Australia, and most other countries. To convert mg/dL to mmol/L, divide by 18. To convert mmol/L to mg/dL, multiply by 18. The exact conversion factor is 18.0182 based on glucose's molecular weight (180.16 g/mol).

What is a normal blood sugar level?

Normal fasting blood sugar is 70-99 mg/dL (3.9-5.5 mmol/L). Prediabetes range is 100-125 mg/dL (5.6-6.9 mmol/L). Diabetes is diagnosed at 126 mg/dL (7.0 mmol/L) or higher. After meals, blood sugar typically stays below 140 mg/dL (7.8 mmol/L) in non-diabetic individuals.

How do I convert 100 mg/dL to mmol/L?

To convert 100 mg/dL to mmol/L, divide by 18.0182. The result is approximately 5.55 mmol/L. This is at the upper end of the normal fasting blood sugar range.

What blood sugar level is considered diabetic?

Diabetes is typically diagnosed when fasting blood sugar is 126 mg/dL (7.0 mmol/L) or higher on two separate tests. Random blood sugar of 200 mg/dL (11.1 mmol/L) or higher with symptoms also indicates diabetes. An HbA1c of 6.5% or higher is another diagnostic criterion.

Why do different countries use different blood sugar units?

The US traditionally uses mg/dL (mass concentration), while most other countries adopted the SI unit mmol/L (molar concentration) for standardization. Both measure the same thing - glucose concentration in blood - just with different scales.

What is hypoglycemia and what are its symptoms?

Hypoglycemia (low blood sugar) occurs when blood glucose falls below 70 mg/dL (3.9 mmol/L). Severe hypoglycemia is below 54 mg/dL (3.0 mmol/L). Symptoms include shakiness, sweating, confusion, rapid heartbeat, hunger, irritability, and in severe cases, loss of consciousness.

Additional Resources

Reference this content, page, or tool as:

"Blood Sugar Converter" at https://MiniWebtool.com/blood-sugar-converter/ from MiniWebtool, https://MiniWebtool.com/

by miniwebtool team. Updated: Jan 29, 2026

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