# Blood Sugar Converter (mg/dL ↔ mmol/L)

URL: https://speedycalculator.com/calculators/health/blood-sugar-converter/
Last updated: 2026-10-25

> The blood sugar converter switches glucose readings between mg/dL, used in the U.S., and mmol/L, used in most other countries. One mmol/L of glucose equals about 18 mg/dL.

## Inputs

- Glucose (mg/dL, mmol/L)

## Results

- Glucose

## Formula

```
mmol/L = mg/dL ÷ 18.016
```

## Explanation

Glucose meters and lab reports use different units around the world, so converting avoids dangerous misreadings.

### How to use the Blood Sugar Converter

- **Glucose**

Results update as you type, and every field accepts the units shown in its menu.

### How it works

Divide mg/dL by 18.016 (glucose’s molar mass ÷ 10) to get mmol/L, or multiply to go back.

### Example values

How the main result changes when **Glucose** changes and everything else stays at the example values above:

Glucose (mg/dL)Glucose (mmol/L)502.8754.21005.61256.91508.320011.1
*Health note: this calculator is for education and screening only and is not a diagnosis or treatment advice. Discuss your results with a qualified clinician.*

## Worked example

Inputs — Glucose: 100 mg/dL.

Results — **Glucose = 5.6 mmol/L**.

## FAQ

**What is a normal fasting glucose?**
Below 100 mg/dL (5.6 mmol/L); 100–125 mg/dL suggests prediabetes.

**Is the factor the same for cholesterol?**
No, cholesterol uses 38.67 and triglycerides 88.57.

**What formula does the Blood Sugar Converter use?**
mmol/L = mg/dL ÷ 18.016.