Speedy Calculator

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

Health Updated October 25, 2026

Quick answer

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.

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

How to use the Blood Sugar Converter

  1. 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)
50 2.8
75 4.2
100 5.6
125 6.9
150 8.3
200 11.1

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.

Formula

mmol/L = mg/dL ÷ 18.016

Worked example

Inputs — Glucose: 100 mg/dL.
Results — Glucose = 5.6 mmol/L.

Frequently asked questions

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.

Cite this calculator

Speedy Calculator. (2026). Blood Sugar Converter (mg/dL ↔ mmol/L). Speedy Calculator. https://speedycalculator.com/calculators/health/blood-sugar-converter/