Essential

Needed for the site and its tools to work. We do not currently set cookies of our own; your choice on this panel is kept in your browser's local storage.

Always on

Health ICU
English

Health Converters tool

Blood Glucose Converter

Convert blood glucose between mmol/L and mg/dL, and HbA1c between % and mmol/mol, with the estimated average glucose. Free, in your browser, nothing stored.

Nothing you enter leaves your device.

Inputs

Ask your care team which targets apply to you.

Results

Enter values to see your results.

Simple steps

How it works

  1. 01

    Choose the conversion you need.

  2. 02

    Enter the value from your meter or lab report.

  3. 03

    Select Convert to see the value in the other unit.

Good to know

Frequently asked questions

How are mmol/L and mg/dL related?

One mmol/L of glucose is 18.016 mg/dL, because a glucose molecule weighs 180.16 g per mole. So 5.5 mmol/L is about 99 mg/dL.

What do the two HbA1c units mean?

HbA1c is given as a percentage (the NGSP/DCCT unit used in the United States) or in mmol/mol (the IFCC unit used in the UK and much of Europe). They measure the same thing.

What is the estimated average glucose?

It is the average blood glucose that matches an HbA1c result, from a large study (ADAG). For example, an HbA1c of 7% matches about 154 mg/dL (8.6 mmol/L).

Does this tool tell me if my reading is normal?

No. It converts units only. Which targets apply to you depends on your situation; ask your care team.

Why might my meter show a different number from the lab?

Meters and labs can differ by up to 15%, and meters may report plasma or whole-blood values. Use the same device for comparisons.

Does it store my readings?

No. It is a converter, not a log: nothing is saved or sent.

Which countries use which unit?

mg/dL is used in the United States, much of Latin America and parts of Asia and the Middle East; mmol/L in the UK, Canada, Australia and much of Europe.

How it is calculated

Glucose: mg/dL = mmol/L × 18.016 (glucose molar mass 180.16 g/mol). HbA1c: mmol/mol = (% − 2.15) × 10.929 (IFCC–NGSP master equation). Estimated average glucose (ADAG study): mg/dL = 28.7 × HbA1c (%) − 46.7.

Sources

Last reviewed: October 14, 2026

Keep going