Glucose to A1C Calculator

Convert your blood glucose readings to estimated A1C percentage

Blood Glucose to A1C Calculator

Use this calculator to estimate your A1C percentage based on your average blood glucose levels. A1C provides a picture of your average blood glucose control over the past 2-3 months.

Enter your average blood glucose level (mg/dL):

Note: This calculator provides an estimated A1C value based on the ADAG (A1C-Derived Average Glucose) formula. For accurate A1C measurement, consult your healthcare provider for a laboratory test.

How to Calculate A1C From Blood Glucose

The relationship between average blood glucose (eAG) and A1C is calculated using the following formula:

A1C = (46.7 + average glucose) / 28.7

This formula was derived from the ADAG study and is recognized by the American Diabetes Association. Here's what the numbers mean:

A1C %	Estimated Average Glucose (mg/dL)	Interpretation
Below 5.7	Below 117	Normal
5.7 - 6.4	117 - 137	Prediabetes
6.5 or above	140 or above	Diabetes

Understanding Your Results

Your A1C test result reflects your average blood sugar level for the past two to three months. Specifically, the A1C test measures what percentage of your hemoglobin is coated with sugar (glycated hemoglobin).

Why A1C Matters

Diabetes diagnosis: A1C of 6.5% or higher on two separate tests indicates diabetes
Prediabetes: A1C between 5.7% and 6.4% indicates prediabetes
Treatment monitoring: Shows how well your diabetes treatment plan is working
Risk assessment: Higher A1C levels are associated with diabetes complications

Important: While this calculator provides useful estimates, it cannot replace professional medical advice. Always consult with your healthcare provider about your blood sugar management.

mg/dL to A1C Conversion Chart

For quick reference, here's a conversion chart showing how various average glucose levels translate to A1C percentages:

Average Glucose (mg/dL)	Estimated A1C %
100	5.1
125	5.6
150	6.3
175	6.9
200	7.5
225	8.1
250	8.7
275	9.3
300	9.9