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Blood Sugar Converter

Health

Convert blood glucose readings between mg/dL and mmol/L instantly using the standard 18.0182 conversion factor — accurate for US and international units.

Convert
Blood Glucose Value (mg/dL)
mg/dL

Converted Value

0mmol/L

Reference Range (Fasting)

Prediabetes range (fasting)

Based on ADA fasting glucose guidelines: Normal <100 mg/dL, Prediabetes 100-125 mg/dL, Diabetes ≥126 mg/dL. This is informational only, not a diagnosis.

What is a Blood Sugar?

A Blood Sugar Converter translates blood glucose readings between the two units used worldwide: mg/dL (milligrams per deciliter), the standard in the United States, and mmol/L (millimoles per liter), used in most of Europe, Canada, Australia, and elsewhere. Both units measure the exact same physical quantity — the concentration of glucose in your blood — but expressed on different scales, using the precise molar mass of glucose (18.0182 g/mol) as the conversion factor.

This becomes essential whenever you're comparing readings across sources that use different units — an imported glucose meter, medical records from another country, or international health guidelines written in mmol/L when your device reports mg/dL. Getting the conversion right matters for correctly interpreting whether a reading falls in a normal, prediabetic, or diabetic range, so pairing this with the Diabetes Risk Calculator can give useful additional context.

How to use this Blood Sugar calculator

  1. Choose your conversion direction — mg/dL → mmol/L or mmol/L → mg/dL.
  2. Enter your Blood Glucose Value in the appropriate starting unit.
  3. Review the Converted Value shown in the result card.
  4. Check the Reference Range note for general context on where the fasting-equivalent value falls.
  5. Repeat with different readings to compare multiple test results across units.

Formula & Methodology

mg/dL → mmol/L: mmol/L = mg/dL ÷ 18.0182

mmol/L → mg/dL: mg/dL = mmol/L × 18.0182

Worked example: Converting a fasting reading of 95 mg/dL to mmol/L:

95 ÷ 18.0182 ≈ 5.27 mmol/L

This falls within the normal fasting range of below 100 mg/dL (5.6 mmol/L) per ADA guidelines.

Frequently Asked Questions

Divide the mg/dL value by 18.0182 to get mmol/L — for example, 100 mg/dL equals approximately 5.55 mmol/L. This conversion factor is derived from the molar mass of glucose (180.16 g/mol) and is the internationally standardized conversion used in clinical settings.
Multiply the mmol/L value by 18.0182 to get mg/dL — for example, 5.5 mmol/L equals approximately 99.1 mg/dL. This is simply the inverse of the mg/dL-to-mmol/L conversion.
The United States primarily uses mg/dL (milligrams per deciliter), while most of Europe, Canada, Australia, and many other countries use mmol/L (millimoles per liter) as the standard clinical unit for blood glucose. Both measure the same underlying quantity — the concentration of glucose in blood — just expressed in different units.
According to American Diabetes Association guidelines, a normal fasting blood glucose level is below 100 mg/dL (5.6 mmol/L). Levels between 100-125 mg/dL (5.6-6.9 mmol/L) fall in the prediabetes range, and 126 mg/dL (7.0 mmol/L) or higher on two separate tests indicates diabetes.
This converter performs accurate mathematical unit conversion using the standard 18.0182 factor, but it is an informational tool, not a diagnostic device. Always use your glucose meter's actual reading and consult a healthcare provider for medical interpretation and decisions.
18.0182 is the precise molar mass of glucose in g/mol, and using this more exact figure produces more accurate conversions than the commonly rounded factor of 18. For most everyday purposes, using 18 as an approximation is close enough, but 18.0182 gives clinical-grade precision.
Hypoglycemia (low blood sugar) is generally defined as a reading below 70 mg/dL (3.9 mmol/L), though symptoms and thresholds can vary by individual, especially for people on insulin or certain diabetes medications. Severe hypoglycemia requiring immediate treatment is typically below 54 mg/dL (3.0 mmol/L).
Enter your meter's reading into this converter using the correct starting unit, and it will instantly show the equivalent value in the other unit so you can compare it against reference ranges or your doctor's notes regardless of which unit they use.
No — A1C (glycated hemoglobin) is reported as a percentage reflecting average blood sugar over roughly 2-3 months, which is a different measurement entirely from a single-point mg/dL or mmol/L glucose reading. This converter is specifically for point-in-time glucose unit conversion, not A1C.
Yes — the mg/dL to mmol/L conversion factor is the same regardless of whether the reading is fasting, postprandial, or random; only the reference ranges for interpreting 'normal' differ by testing context.
200 mg/dL converts to approximately 11.1 mmol/L (200 ÷ 18.0182), a level generally considered diagnostic of diabetes when found in a random blood glucose test accompanied by symptoms.
Also known as
mg/dL to mmol/L converterblood glucose unit converterglucose converterblood sugar unit conversionmmol to mg/dL