Blood Sugar Converter
Convert blood glucose between mg/dL (US units) and mmol/L (international units). Essential for interpreting lab results from different countries.
This free online blood sugar converter provides instant results with no signup required. All calculations run directly in your browser — your data is never sent to a server. Enter your values below and see results update in real time as you type. Perfect for everyday calculations, homework, or professional use.
Results
mg/dL → mmol/L
0 mmol/L
mmol/L → mg/dL
0 mg/dL
How to Use This Calculator
Enter your input values
Fill in all required input fields for the Blood Sugar Converter. Most fields include unit selectors so you can work in your preferred unit system — metric or imperial, whichever matches your problem.
Review your inputs
Double-check that all values are correct and that you have selected the right units for each field. Incorrect units are the most common source of calculation errors and can produce results that are off by factors of 2, 10, or more.
Read the results
The Blood Sugar Converter instantly computes the output and displays results with units clearly labeled. All calculations happen in your browser — no loading time and no data sent to a server.
Explore parameter sensitivity
Try adjusting individual input values to see how the output changes. This is a quick and effective way to develop intuition about how different parameters influence the result and to identify which inputs have the largest effect.
Formula Reference
Blood Sugar Converter Formula
See calculator inputs for the governing equation
Variables: All variables and their units are labeled in the calculator interface above. Input fields accept values in multiple unit systems — select your preferred unit from the dropdown next to each field.
When to Use This Calculator
- •Use the Blood Sugar Converter for personal health tracking and wellness monitoring, establishing a baseline and tracking changes over time.
- •Use it when recording fitness metrics to track progress toward health or athletic goals.
- •Use it to compare measurements before and after a lifestyle, diet, or training change to quantify the impact.
- •Use it as a conversation starter before a doctor's appointment, bringing objective data to discuss with a healthcare professional.
About This Calculator
The Blood Sugar Converter is a free health and wellness calculation tool designed for personal use and general informational purposes. Convert blood glucose between mg/dL (US units) and mmol/L (international units). Essential for interpreting lab results from different countries. This calculator provides reference values based on established health screening formulas and should not be used as a substitute for professional medical advice, diagnosis, or treatment. Results may vary based on individual factors not captured by the calculation. Consult a qualified healthcare provider for personalized health guidance. All calculations are performed locally in your browser — no personal health data is transmitted or stored.
About Blood Sugar Converter
The Blood Sugar Converter converts glucose measurements between mg/dL (milligrams per deciliter, used in the US) and mmol/L (millimoles per liter, used internationally). Understanding both units is important because medical literature, diabetes apps, and international travel expose patients to different standards. The conversion factor is 18.018, derived from glucose's molecular weight of 180.156 g/mol.
The Math Behind It
Formula Reference
Glucose Conversion
mmol/L = mg/dL ÷ 18.018 | mg/dL = mmol/L × 18.018
Variables: Based on glucose molecular weight
Worked Examples
Example 1: Convert 120 mg/dL
US reading of 120 mg/dL to mmol/L
120 mg/dL = 6.7 mmol/L
Example 2: Convert 6.0 mmol/L
International reading of 6.0 mmol/L to mg/dL
6.0 mmol/L = 108 mg/dL
Common Mistakes & Tips
- !Using simpler approximation factors like 18 instead of 18.018, which can cause small errors.
- !Confusing mg/dL with mg/L (different by 10x).
- !Applying this conversion to other lab values (cholesterol, creatinine) which use different conversion factors.
Related Concepts
Used in These Calculators
Calculators that build on or apply the concepts from this page:
Frequently Asked Questions
Why do different countries use different units?
Historical reasons. The US and a few other countries use the older mass-based system (mg/dL) while most of the world has adopted SI units (mmol/L) for scientific consistency.
Which unit is better?
Neither is objectively better. mmol/L is the scientific standard and used in most research. mg/dL is more intuitive for many Americans who grew up with it. What matters is using consistent units.