Hemoglobin A1c Calculator

Calculate estimated hemoglobin A1c percentage from average blood glucose values using ADA-recommended formulas.

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About This Tool

This hemoglobin A1c calculator allows healthcare professionals and patients to estimate glycated hemoglobin (HbA1c) levels from average blood glucose measurements. The tool implements the American Diabetes Association (ADA) formula for converting between glucose values (mg/dL or mmol/L) and A1c percentage. It provides instant calculations with clear result interpretation according to clinical guidelines.

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How to Use

Select your glucose measurement unit (mg/dL or mmol/L)
Enter your average blood glucose value in the input field
Choose whether you want to calculate A1c from glucose or glucose from A1c
Click the 'Calculate' button to see your results
View the calculated value along with clinical interpretation

Frequently Asked Questions

Find Quick Answers

What is hemoglobin A1c?

Hemoglobin A1c (HbA1c) is a form of hemoglobin that is chemically linked to glucose. It reflects average blood glucose levels over the past 2-3 months and is used to diagnose and monitor diabetes.

How accurate is this calculator?

This calculator uses the American Diabetes Association (ADA) formula: A1c = (46.7 + average glucose in mg/dL) / 28.7. While it provides a good estimate, laboratory testing is required for precise clinical diagnosis.

What glucose units does the calculator support?

The calculator supports both mg/dL (milligrams per deciliter) and mmol/L (millimoles per liter) units. You can switch between them using the unit selector.

Can I calculate glucose from A1c?

Yes, the calculator works both ways. You can calculate estimated A1c from glucose values, or calculate estimated average glucose from an A1c percentage.

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