Blood Sugar Converter

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Health • mg/dL ↔ mmol/L

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How to Use the Blood Sugar Converter

Enter a value — type any number. Invalid text and symbols are blocked automatically.
Select From and To units — choose the units to convert between.
Read the animated result — the converted value, factor, and full reference table update instantly.
Use Swap (⇄) — reverse the conversion in one click.

Why Use This Blood Sugar Converter

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mmol/L is the reference unit

All 2 units on the Blood Sugar Converter are defined against the Millimole/liter (mmol/L), so each result is one conversion factor away from a single reference rather than the end of a chain of roundings.

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Opens on Milligram/deciliter → Millimole/liter

The conversion this page is most often opened for is ready before you type anything: 1 mg/dL = 0.0555075 mmol/L. Change either side and every row in the table recalculates with it.

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Understanding the Blood Sugar Converter

The US, Germany and a few others report blood glucose in milligrams per deciliter (mg/dL); most of the world uses millimoles per litre (mmol/L). The exact relationship is mmol/L = mg/dL ÷ 18.0182 (the molar mass of glucose). For example 100 mg/dL ≈ 5.6 mmol/L, and a fasting level of 126 mg/dL (7.0 mmol/L) is the diabetes threshold.

This is a unit conversion for convenience and education — it is not a diagnosis. Always interpret readings with your clinician and meter's guidance.

Common Blood Sugar Converter Values

Quick reference — 1 Milligram/deciliter (mg/dL) is equal to:

Millimole/liter

mmol/L

0.0555075

Formula & Logic

Blood glucose is reported in milligrams per decilitre in the US and millimoles per litre in most of the world, related by a single factor of 18.018 derived from glucose's molar mass of 180.16 g/mol. Unlike a lipid panel, only one factor applies, which makes the conversion simple — but the stakes of getting it wrong are immediate rather than long-term. The familiar landmarks translate cleanly: 70 mg/dL, the usual hypoglycaemia threshold, is 3.9 mmol/L, and 180 mg/dL, a common post-meal ceiling, is 10.0 mmol/L. Anyone reading a meter set to the wrong unit is out by a factor of eighteen, which is unmistakable in one direction and dangerous in the other.

mmol/L = mg/dL ÷ 18.018mg/dL = mmol/L × 18.018Landmarks: 70 mg/dL = 3.9 · 100 = 5.6 · 140 = 7.8 · 180 = 10.0 mmol/LEstimated average glucose from A1c: eAG(mg/dL) = 28.7 × A1C − 46.7

where:

18.018: from glucose's molar mass, 180.16 g/mol
mg/dL: US, and also Japan, France and much of Latin America
mmol/L: UK, Canada, Australia, China and most of Europe

Assumptions: Meter readings carry an accuracy tolerance of roughly ±15% under ISO 15197, so small differences between readings are within measurement noise. Diagnosis and treatment targets are clinical decisions.

SourceISO 15197:2013

Worked Example: A Fasting Reading of 126 mg/dL

Convert the diabetes diagnostic threshold and check it against the surrounding landmarks.

Fasting glucose126 mg/dL

Divide by the factor: 126 ÷ 18.018 = 6.99 mmol/L, or 7.0.
That is the fasting diagnostic threshold in both unit systems — 126 and 7.0 name the same value.
Check the normal ceiling: 100 mg/dL ÷ 18.018 = 5.55 mmol/L.
And the hypoglycaemia line: 70 ÷ 18.018 = 3.88, conventionally quoted as 3.9 mmol/L.
Reverse one to confirm: 10.0 mmol/L × 18.018 = 180.2 mg/dL.
Note the granularity: 1 mmol/L is 18 mg/dL, so mmol readings carry a decimal place for the same precision.

Result126 mg/dL = 7.0 mmol/L

The factor of 18 makes unit confusion self-evident in one direction — a "5.6" reading on a mg/dL scale is impossible — but not the other, since a reading of 100 is plausible in neither unit for a healthy person on mmol/L. Always confirm which unit a meter is set to before interpreting an unfamiliar device.