Blood Sugar Converter
Convert blood glucose levels between mg/dL and mmol/L instantly. Also converts HbA1c to estimated average glucose. Includes reference ranges for normal, prediabetes, and diabetes.
Blood Glucose Converter
HbA1c to Average Glucose
| Normal | Prediabetes | Diabetes | |
|---|---|---|---|
| Fasting Blood Sugar | 70-100 mg/dL (3.9-5.6 mmol/L) | 100-125 mg/dL (5.6-6.9 mmol/L) | ≥126 mg/dL (≥7.0 mmol/L) |
| Post-meal (2hr) | <140 mg/dL (<7.8 mmol/L) | 140-199 mg/dL (7.8-11.0 mmol/L) | ≥200 mg/dL (≥11.1 mmol/L) |
| HbA1c | <5.7% | 5.7-6.4% | ≥6.5% |
About the Blood Sugar Converter
The Blood Sugar Converter on ToolHaven is a free, browser-based tool that helps you convert blood glucose levels between mg/dL and mmol/L instantly. Also converts HbA1c to estimated average glucose. Includes reference ranges for normal, prediabetes, and diabetes. It runs entirely in your browser, so no data is sent to any server, and no account or signup is required. Whether you are a student, professional, or just someone looking for a quick answer, this tool gives you accurate results in seconds.
How to use the Blood Sugar Converter
Using this tool is straightforward. Enter your blood sugar reading and pick whether it's in mg/dL or mmol/L. The converted value appears instantly along with which range your reading falls into. Use the HbA1c section to convert your A1c percentage to an estimated average glucose level. The reference table at the bottom shows normal ranges for fasting, post-meal, and HbA1c.
Results are updated instantly as you enter values, so there is no need to click a submit button. You can adjust inputs freely and compare different scenarios in real time.
Why use ToolHaven?
ToolHaven offers 178+ free online calculators and tools across categories including Finance, Health, Math, Education, and more. All tools are free to use, require no installation, and work on any device. Your inputs never leave your browser, so your data stays private. The Blood Sugar Converter is part of our Health collection. Explore related tools in the sidebar to get more done in one place.
How to use
- Enter your blood sugar reading and pick whether it's in mg/dL or mmol/L.
- The converted value appears instantly along with which range your reading falls into.
- Use the HbA1c section to convert your A1c percentage to an estimated average glucose level.
- The reference table at the bottom shows normal ranges for fasting, post-meal, and HbA1c.
Related tools:
Blood glucose levels are measured in two different units around the world. India, the US, and most of Asia use mg/dL (milligrams per deciliter). Europe, the UK, Canada, and Australia use mmol/L (millimoles per liter). The two are simply different scales for the same measurement - 1 mmol/L equals approximately 18 mg/dL.
HbA1c (glycated hemoglobin) measures your average blood sugar over the past 2-3 months. Unlike a single reading which fluctuates with meals and time of day, HbA1c gives a longer-term picture. The calculator converts your HbA1c percentage to an estimated average glucose using the IFCC formula.
Frequently Asked Questions
What is a normal fasting blood sugar?
Normal fasting blood sugar is 70-100 mg/dL (3.9-5.6 mmol/L). Readings between 100-125 mg/dL suggest prediabetes. A reading of 126 mg/dL or higher on two separate tests typically indicates diabetes.
How do I convert mg/dL to mmol/L?
Divide mg/dL by 18.015 to get mmol/L. To go the other way, multiply mmol/L by 18.015. For quick mental math: divide by 18 (close enough for most purposes).
What HbA1c is considered diabetic?
An HbA1c of 6.5% or higher on two separate tests is the diagnostic threshold for diabetes. 5.7-6.4% is the prediabetes range. Below 5.7% is normal.
My glucometer reads in mg/dL but my doctor's report shows mmol/L. Are they the same reading?
Yes, just different units. A glucometer reading of 126 mg/dL is the same as 7.0 mmol/L. The reading itself is the same - only the unit of measurement differs.