Enter glucose readings
Use one value per line, comma separated values, or dated rows like 2026-03-01,118.
Formula used
Average blood sugar: Average = Sum of glucose readings ÷ Number of readings.
Median: The middle value after sorting all readings. For an even count, average the two middle values.
Range: Range = Maximum reading − Minimum reading.
Standard deviation: Measures how far readings spread around the mean.
Coefficient of variation: CV% = (Standard deviation ÷ Mean) × 100.
Estimated A1c from average glucose: A1c = (eAG + 46.7) ÷ 28.7, where eAG is average glucose in mg/dL.
Estimated average glucose from HbA1c: eAG = (28.7 × HbA1c) − 46.7.
In range percentage: In range % = (Readings within target ÷ Total readings) × 100.
How to use this calculator
- Enter your preferred report title for the result panel.
- Select the same unit used in your glucose readings.
- Type your target low and target high values.
- Optionally add a recent HbA1c to compare with your reading average.
- Paste readings as one value per line, comma-separated entries, or dated rows.
- Click the calculate button to display results above the form.
- Review averages, variability, target-range performance, and daily summaries.
- Use the CSV or PDF buttons to save a shareable report.
Example data table
| Date | Fasting | After breakfast | After dinner |
|---|---|---|---|
| 2026-03-01 | 98 mg/dL | 112 mg/dL | 141 mg/dL |
| 2026-03-02 | 104 mg/dL | 126 mg/dL | 158 mg/dL |
| 2026-03-03 | 95 mg/dL | 118 mg/dL | 146 mg/dL |
You can enter just the numbers, or include dates for daily averages.
FAQs
1. What does this calculator measure?
It measures your average blood sugar from entered readings and adds supporting statistics like median, range, variability, and target-range percentages.
2. Can I enter mmol/L instead of mg/dL?
Yes. Choose mmol/L before calculating. The tool converts values internally so the formulas remain consistent and the displayed results match your selected unit.
3. How are dated rows handled?
If you enter rows such as 2026-03-01,118, the calculator stores the date, includes the reading in the full analysis, and also builds daily averages.
4. What is estimated A1c?
Estimated A1c is a mathematical conversion of average glucose. It is useful for trend review, but it does not replace a laboratory HbA1c test.
5. Why is coefficient of variation included?
Coefficient of variation shows how steady or variable your glucose readings are relative to the average, making trend changes easier to compare.
6. Can I export the report?
Yes. After results appear, use the CSV button for spreadsheet-ready data or the PDF button for a printable summary page.
7. Does this tool diagnose any condition?
No. It is an informational calculator for organizing readings and spotting trends. Diagnosis and treatment decisions should come from a qualified clinician.
8. What input format works best?
One reading per line is simplest. You can also paste comma-separated values or date-plus-value rows if you want daily average calculations.