Blood Glucose Converter

Convert blood sugar levels between mg/dL and mmol/L units. Essential for diabetes management and international health comparisons.

mg/dL
mmol/L

Quick Reference Ranges

Category mg/dL mmol/L
Normal Fasting 70-99 3.9-5.5
Prediabetes Fasting 100-125 5.6-6.9
Diabetes Fasting 126+ 7.0+
Hypoglycemia <70 <3.9

Quick Facts

Conversion Factor
18.0182
Based on glucose molecular weight
mg/dL Countries
US, Japan, France
Also Egypt, Colombia, Israel
mmol/L Countries
UK, Canada, Australia
Most of Europe and Asia
Normal Fasting
70-99 mg/dL
3.9-5.5 mmol/L

Understanding Blood Glucose Units

Blood glucose (blood sugar) levels can be measured in two different units depending on the country or healthcare system. Understanding the conversion between these units is essential for managing diabetes effectively, especially when traveling or using international medical resources.

The Conversion Formula

mg/dL = mmol/L x 18.0182

mmol/L = mg/dL / 18.0182

The factor 18.0182 comes from the molecular weight of glucose (180.182 g/mol) divided by 10.

Which Countries Use Which Units?

mg/dL (milligrams per deciliter)

Used in:

  • United States
  • Japan
  • France
  • Egypt
  • Colombia
  • Israel

mmol/L (millimoles per liter)

Used in:

  • United Kingdom
  • Canada
  • Australia
  • China
  • Most of Europe
  • Most of Asia

Blood Glucose Target Ranges

For Non-Diabetics

  • Fasting: 70-99 mg/dL (3.9-5.5 mmol/L)
  • 2 hours after eating: Less than 140 mg/dL (7.8 mmol/L)

For People with Diabetes (ADA Recommendations)

  • Before meals: 80-130 mg/dL (4.4-7.2 mmol/L)
  • 1-2 hours after meals: Less than 180 mg/dL (10.0 mmol/L)

Common Conversions Quick Reference

mg/dLmmol/L
703.9
804.4
1005.6
1206.7
1407.8
18010.0
20011.1
25013.9
30016.7

Medical Disclaimer

This converter is provided for informational purposes only. Blood glucose reference ranges may vary based on individual health conditions, age, and other factors. Always follow your healthcare provider's specific recommendations for blood glucose targets. If you experience symptoms of high or low blood sugar, seek medical attention immediately.

Frequently Asked Questions

How accurate are the results?
The Blood Glucose Converter applies a standard formula to your inputs — accuracy depends on how precisely you measure those inputs. For planning and estimation, results are reliable. For high-stakes or professional decisions, cross-check the output with a domain expert or primary source.
Can I use this to adjust my medication?
No. Medication decisions require a licensed clinician who can consider your full medical history, lab trends, concurrent medications, and contraindications. This calculator is for educational understanding only.
How should I interpret the Blood Glucose Converter output?
The result is a calculated estimate based on the formula and your inputs. Compare it against the reference values or benchmarks shown on this page to understand whether your result is high, low, or typical. For decisions with real consequences, use the output as one data point alongside direct measurement and professional advice.
When should I use a different approach?
Use this calculator for quick, formula-based estimates. If your situation involves multiple interacting variables, time-varying inputs, or safety-critical decisions, consider a dedicated software tool, professional consultation, or direct measurement. Calculators are most reliable within their stated assumptions — check that your scenario matches those assumptions before relying on the output.