# A1C Calculator

> Convert between A1C percentage and average blood glucose (eAG) in mg/dL or mmol/L.

**URL:** https://www.calculatoranswers.com/a1c-calculator
**Category:** Health

## Quick Answer

Convert your estimated average glucose (eAG) readings into an estimated A1C percentage. Useful for diabetic patients tracking blood sugar between lab visits.

## Definition

An A1C calculator is a medical conversion tool that translates estimated average glucose (eAG) levels from daily blood sugar monitoring into an approximate Hemoglobin A1c percentage, or vice versa. The conversion uses the regression published by the ADAG Study Group in Diabetes Care in 2008: eAG (mg/dL) = 28.7 × A1C − 46.7, fitted with an R-squared of 0.84. It helps diabetic patients correlate their daily glucometer readings with their long-term A1C lab results.

## How to Use

1. **Choose your input type** — Select whether you are converting from estimated Average Glucose (eAG) or Hemoglobin A1c.
2. **Enter your measured value** — Input your lab result or glucometer reading.
3. **Read the converted value** — View the equivalent conversion calculated using the standard ADA formula.

## Disclaimer

This calculator provides estimates for educational and planning purposes. Always consult a qualified professional for specific advice on financial, medical, legal, or other regulated decisions.

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