Blood Sugar Converter
Type in either mg/dL or mmol/L — the other updates live. Conversion factor: 18.016.
Reference Ranges
| Category | Fasting (mg/dL) | Fasting (mmol/L) | Post‑meal (mg/dL) | Post‑meal (mmol/L) |
|---|---|---|---|---|
| Normal | 70–99 | 3.9–5.5 | <140 | <7.8 |
| Prediabetes | 100–125 | 5.6–6.9 | 140–199 | 7.8–11.0 |
| Diabetes | ≥126 | ≥7.0 | ≥200 | ≥11.1 |
How to Use Blood Sugar Converter
- Type a value in mg/dL. Enter your blood glucose reading in milligrams per decilitre, the unit commonly used in India and the United States.
- Or type a value in mmol/L. If your lab report uses millimoles per litre (common in the UK and Canada), enter the number there instead.
- Watch the other field update live. As you type, the converter instantly calculates the equivalent in the other unit using the factor 18.016, no button click needed.
- Check the reference table. The built‑in chart shows fasting and post‑meal normal, prediabetes and diabetes ranges in both units, helping you interpret your result.
Benefits of Blood Sugar Converter
- Live two‑way conversion means you don’t have to choose an input field; just type where it’s convenient and the other updates automatically.
- Uses the precise conversion factor (18.016), giving more accurate results than the common 18× approximation.
- The embedded reference table provides instant clinical context, showing whether a reading falls into the normal, prediabetic or diabetic range.
- No data leaves your device — your health readings remain completely private.
Frequently Asked Questions
Why do different countries use different blood sugar units?
mg/dL measures the actual mass of glucose in a volume of blood, while mmol/L counts the number of molecules. Both are valid; the difference is a historical convention that persists regionally.
What is a normal fasting blood sugar level?
A normal fasting glucose is 70–99 mg/dL (3.9–5.5 mmol/L). Fasting levels between 100–125 mg/dL suggest prediabetes, and 126 mg/dL or above on two separate tests indicates diabetes.
Can I use this converter for A1C values?
No. A1C is a percentage reflecting a three‑month average, not a spot glucose reading. Toolzo offers a separate A1C Calculator to convert A1C to estimated average glucose.
Is Blood Sugar Converter free and private?
Yes — it is 100% free, needs no sign‑up, and everything runs in your browser; your data never leaves your device.
Disclaimer: This tool is for educational purposes only and is not medical advice. Always consult a qualified doctor for health decisions.