Blood Sugar Converter: mg/dL to mmol/L, HbA1c & More

About the Health Unit Converter

Health numbers come in two flavors depending on where you are. The United States usually reports blood sugar and cholesterol in mg/dL, while most of the world uses mmol/L; HbA1c is shown as a percentage in some countries and as mmol/mol in others. This converter handles those clinical conversions plus the everyday ones — weight, height, and body temperature — so a lab result, a fitness app, or a doctor abroad all make sense. Type a value in any field and every other unit updates instantly.

Because health data is personal, everything runs entirely in your browser. Nothing you type is sent to a server, logged, or stored anywhere — it just converts and disappears when you close the tab.

What it converts

Blood sugar (glucose): mg/dL ↔ mmol/L. Divide mg/dL by 18.0182 to get mmol/L.
HbA1c: DCCT % ↔ IFCC mmol/mol, plus estimated average glucose (eAG) in both mg/dL and mmol/L. mmol/mol = (% − 2.15) × 10.929; eAG mg/dL = 28.7 × % − 46.7.
Cholesterol & lipids: mg/dL ↔ mmol/L, with the correct factor for total/HDL/LDL (÷38.67) versus triglycerides (÷88.57).
Body weight: kilograms ↔ pounds ↔ stone & pounds.
Height: centimeters ↔ inches ↔ feet & inches.
Body temperature: Celsius ↔ Fahrenheit.

Quick reference

Fasting glucose around 100 mg/dL ≈ 5.6 mmol/L.
An HbA1c of 6.5% ≈ 48 mmol/mol ≈ an average glucose near 140 mg/dL.
Total cholesterol of 200 mg/dL ≈ 5.2 mmol/L.
Normal body temperature 37 °C = 98.6 °F.

Good to know

The math is exact and runs locally, so conversions are instant and work offline once the page has loaded.
Reference ranges vary by lab, age, and condition — use this to translate units, not to diagnose. For anything that matters, check your lab report or ask a professional.

Common questions

How do I convert blood sugar from mg/dL to mmol/L?

Enter the value in either unit and read the other instantly. The conversion factor is 18: US labs report glucose in mg/dL while most of the world uses mmol/L, and the tool translates both directions so any reading makes sense.

What does my HbA1c convert to in average blood sugar?

Enter your HbA1c percentage and see both the mmol/mol equivalent and the estimated average glucose (eAG), the day-to-day number your meter speaks. It connects the quarterly lab figure to what you actually see.

Why do my lab results use different units than what I read online?

Different countries standardized differently: the US uses conventional units (mg/dL), most others use SI units (mmol/L). Articles, devices, and doctors mix them constantly, which is exactly the confusion this converter removes.

What health units can I convert?

Blood glucose, HbA1c with eAG, cholesterol, body weight, height, and temperature, covering the values that appear on standard lab reports and device readouts.

Is my health data private here?

Yes. Conversions run in your browser, so the numbers from your lab report are never sent, stored, or profiled.