Blood Sugar Conversion — mg/dL to mmol/L and Back

This page is reference information, not medical advice.

Nothing here can diagnose you, and nothing here is a treatment plan. Blood glucose results are interpreted by a doctor alongside your history, your symptoms and a repeat test — a single number on a screen is not a diagnosis. If any reading concerns you, or if you feel unwell, see a doctor rather than a website.

Why one specimen has two numbers

A laboratory measures one thing: the concentration of glucose in plasma. Everything below is a change of unit, not a change of measurement.
mg/dL is a mass concentration — milligrams of glucose per decilitre. India, the United States and much of Asia report it.
mmol/L is a molar concentration — millimoles per litre. The UK, Australia, Canada and most of Europe report it.
The bridge between them is the molar mass of glucose, 180.16 g/mol, which in these units is 18.016. The clinical shorthand of “divide by 18” is accurate to within a rounding error across the entire reporting range.
No cut-point moves when the unit does. 126 mg/dL and 7.0 mmol/L are the same threshold written twice.

mmol/L = mg/dL / 18.016
mg/dL  = mmol/L x 18.016

Full methodology →

Conversion panel

Both directions

Blood glucose in mg/dL (used in India, the US and much of Asia) and mmol/L (used in the UK, Australia, Canada and most of Europe). Divide mg/dL by 18.016 for mmol/L; multiply mmol/L by 18.016 for mg/dL.
mg/dL	mmol/L	mmol/L	mg/dL
70	3.9	3.0	54
80	4.4	4.0	72
90	5.0	5.0	90
100	5.6	6.0	108
110	6.1	7.0	126
120	6.7	8.0	144
126	7.0	9.0	162
130	7.2	10.0	180
140	7.8	11.0	198
150	8.3	12.0	216
160	8.9	13.0	234
180	10.0	14.0	252
200	11.1	15.0	270
220	12.2	16.0	288
250	13.9	17.0	306
300	16.7	18.0	324
350	19.4	19.0	342
400	22.2	20.0	360

The two halves of this table are independent — the left pair converts mg/dL to mmol/L, the right pair converts mmol/L back to mg/dL. The shorthand most clinicians use is "divide by 18", which is accurate to within a rounding error at every value on this page.

SOURCE·Molar mass of glucose, 180.16 g/mol·the factor is arithmetic, not a published range·REVIEWED JUL 2026

Reference ranges, both units

The thresholds in both units

The published diagnostic thresholds, written in mg/dL as Indian reports print them and in mmol/L as WHO publishes them.
Threshold	mg/dL	mmol/L
Fasting — upper edge of normal (ADA)	99	5.5
Fasting — prediabetes begins (ADA)	100	5.6
Fasting — impaired fasting glucose begins (WHO)	110	6.1
Fasting — diabetes range begins	126	7.0
2 hour — impaired glucose tolerance begins	140	7.8
2 hour — diabetes range begins	200	11.1

SOURCE·ADA Standards of Care 2025 · WHO/IDF 2006·cut-points as published; the unit column is converted, the threshold is not·REVIEWED JUL 2026

Source: American Diabetes Association, Standards of Care in Diabetes — Diagnosis and Classification of Diabetes. Diabetes Care 2025;48(Suppl. 1):S27–S49. Link
Source: World Health Organization / International Diabetes Federation. Definition and diagnosis of diabetes mellitus and intermediate hyperglycaemia: report of a WHO/IDF consultation. Geneva: WHO, 2006. Link

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Questions this report anticipates

How do you convert mg/dL to mmol/L?

Divide by 18.016. Most clinicians round that to 18. A fasting result of 126 mg/dL is 7.0 mmol/L; 200 mg/dL is 11.1 mmol/L.

How do you convert mmol/L to mg/dL?

Multiply by 18.016. So 7.0 mmol/L is 126 mg/dL and 11.1 mmol/L is 200 mg/dL — the two WHO diabetes thresholds, written in the other unit.

Why do India and the UK use different units?

Both describe the same thing. mg/dL is a mass concentration — milligrams of glucose per decilitre of blood. mmol/L is a molar concentration — millimoles per litre. India, the United States and much of Asia report mg/dL; the UK, Australia, Canada and most of Europe report mmol/L. The conversion factor comes from the molar mass of glucose, 180.16 g/mol.

General information only — NOT medical advice, and never a diagnosis. Only a doctor can interpret your results and diagnose or treat diabetes. If a reading concerns you, see a doctor rather than a website. Every threshold, equation and glycemic index value used on this site is listed with its publication on the data & method page, and every publication is listed with its issuing body and its date in the source register.

SOURCE·Published reference ranges + GI tables·REVIEWED JUL 2026

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mg/dL ↔ mmol/L

Why one specimen has two numbers

Both directions

The thresholds in both units

Questions this report anticipates

Follow the build

These sites are a free service I run

mg/dL ↔ mmol/L

Why one specimen has two numbers

Both directions

The thresholds in both units

Questions this report anticipates

Follow the build

Free health & fitness tools for India