Calculator Form
The page uses a single-column layout overall, while the calculator fields switch to 3, 2, and 1 columns responsively.
Saved Conversion History
The latest submissions are saved during the current session.
No saved conversions yet. Submit the form to create a result and build session history.
Example Data Table
These examples show common blood sugar conversions and estimated average glucose relationships.
| Scenario | Input | Converted Value | Practical Note |
|---|---|---|---|
| Fasting Glucose | 90 mg/dL | 5.0 mmol/L | Often seen within a usual fasting target range. |
| Fasting Threshold | 126 mg/dL | 7.0 mmol/L | Important threshold used in diabetes evaluation. |
| Estimated Average Glucose | 7.0% HbA1c | 154.2 mg/dL | Shows average glucose over recent months. |
| Estimated Average Glucose | 7.5% HbA1c | 168.6 mg/dL | Equivalent to about 9.4 mmol/L eAG. |
| Round Number Conversion | 10 mmol/L | 180 mg/dL | Common mental benchmark for quick checks. |
Formula Used
Glucose Unit Conversion
mmol/L = mg/dL ÷ 18
mg/dL = mmol/L × 18
HbA1c and eAG Relationship
eAG (mg/dL) = 28.7 × HbA1c − 46.7
HbA1c = (eAG + 46.7) ÷ 28.7
These formulas are widely used for educational comparison. eAG helps relate a lab HbA1c result to a more familiar glucose-style number.
How to Use This Calculator
- Select the conversion mode that matches your goal.
- Enter the glucose, HbA1c, or eAG value.
- Choose the related unit and reading context when shown.
- Click Convert Blood Sugar to generate the result.
- Review the value, note, chart, and saved history.
- Use the CSV or PDF button to download your visible result set.
FAQs
1. What is the difference between mg/dL and mmol/L?
Both express glucose concentration. mg/dL is common in the United States, while mmol/L is common in many other countries. They measure the same thing using different scales.
2. Why does the glucose conversion use 18?
Glucose has a molecular conversion factor that makes 1 mmol/L equal to about 18 mg/dL. That is why the calculator divides or multiplies by 18.
3. Is HbA1c the same as a fingerstick reading?
No. HbA1c estimates average glucose over roughly two to three months. A fingerstick or continuous monitor reading shows current or short-term glucose at that moment.
4. Can one high reading diagnose diabetes?
No. Diagnosis depends on repeat testing, symptoms, and clinical context. This calculator helps with math and education, but it cannot diagnose or replace medical care.
5. What does eAG mean?
Estimated average glucose converts HbA1c into a glucose number many people find easier to understand. It is an average, not a real-time measurement.
6. Which reading context should I choose?
Use fasting when no calories were consumed for at least eight hours. Use post-meal for a two-hour after-meal check. Use random for unscheduled readings.
7. Why might lab and home values differ?
Meter technique, strip quality, hydration, timing, and lab methods can all affect numbers. Small differences are common, especially around meals or during rapid glucose changes.
8. Can I use this page for treatment decisions?
Use your clinician’s plan, device instructions, and personal targets for treatment decisions. This page is for calculation and recordkeeping support only.