HbA1c Calculator
Turn your HbA1c into an average glucose reading, and see where it sits.
Awaiting Data
Enter your details and tap Calculate to see your results appear here.
Your result appears here.
What it measures
HbA1c shows your average blood sugar over the past two to three months. It reflects the share of haemoglobin coated in glucose, so it smooths out daily swings. Doctors use it to diagnose and track diabetes.
This tool converts that percentage into an estimated average glucose, in both mg/dL and mmol/L, then names the category. Track the bigger picture with our BMI Calculator and Cardiac Risk Index.
How to use this calculator
- Find your HbA1c from a recent lab report.
- Enter the percentage.
- Tap Calculate for your average glucose and category.
The formula used
eAG (mmol/L) = eAG in mg/dL / 18.0
- HbA1c
- Percent of glycated haemoglobin.
- eAG
- Estimated average glucose.
Understanding Your Results
Tips to Improve
- Move daily to improve glucose control.
- Build meals around fibre and protein.
- Limit sugary drinks and refined carbs.
- Recheck HbA1c as your doctor advises.
What your average glucose means
One blood draw, two helpful numbers. The percentage is your HbA1c, while the converted figure is your estimated average glucose, the everyday units a meter shows. Seeing both makes the result easier to act on, since a familiar glucose number feels closer to daily life than a percentage.
Lower numbers usually follow better habits. Movement, fibre, and fewer sugary drinks all help over weeks, not days, because HbA1c reflects a long window. Track the wider picture with our BMI Calculator and Cardiac Risk Index.
Reading the categories
Thresholds are simple to remember. Under 5.7 percent is normal, 5.7 to 6.4 marks prediabetes, and 6.5 or above falls in the diabetes range. One reading rarely settles a diagnosis, so pair it with your doctor's advice. For the full standards, see the American Diabetes Association.
Frequently Asked Questions
Under 5.7 percent is in the normal range for most adults.
It estimates your average glucose over two to three months.
Diagnosis usually needs more than one test. Speak with a doctor.
Scientific References
- Nathan, D. M., et al. (2008). Translating the A1C assay into estimated average glucose. Diabetes Care, 31(8), 1473–1478.
- American Diabetes Association. (2024). Standards of Care in Diabetes.