eAG Calculator

What Is eAG?

eAG stands for estimated Average Glucose. It's your A1C translated into the same units — mg/dL or mmol/L — that you see on a home glucose meter or CGM display. The American Diabetes Association introduced eAG reporting in 2008 to make A1C results more meaningful for patients.

While A1C is expressed as a percentage (e.g. 7.0%), eAG expresses the same information as a blood glucose value (e.g. 154 mg/dL). Most people find it easier to interpret eAG because it speaks the same language as their daily meter readings.

eAG Formula

This calculator uses the validated ADA ADAG formula:

eAG (mg/dL) = (28.7 × A1C%) − 46.7 eAG (mmol/L) = eAG (mg/dL) ÷ 18.016 Source: Nathan et al., Diabetes Care 2008 — validated in the ADAG study

A1C to eAG Reference Table

A1C %	eAG (mg/dL)	eAG (mmol/L)	Status
5.0%	97	5.4	Normal
5.5%	111	6.2	Normal
5.7%	117	6.5	Upper Normal
6.0%	126	7.0	Prediabetes Range
6.5%	140	7.8	Diabetes Threshold
7.0%	154	8.6	Above Target
7.5%	169	9.4	Above Target
8.0%	183	10.2	Above Target
9.0%	212	11.8	High
10.0%	240	13.4	Very High

eAG vs CGM Average — What's the Difference?

Your CGM device reports a real-time average glucose based on actual sensor readings — every 5 minutes, 24 hours a day. eAG, by contrast, is a mathematical estimate derived from your A1C percentage using a population-based formula.

In most cases they'll be close, but they can differ because CGM captures your full glucose variability (including overnight lows and post-meal peaks), while eAG is a statistical average across a population. If your CGM average differs from your eAG by more than 15–20 mg/dL, mention it to your doctor — it may indicate measurement variability or a condition affecting A1C accuracy.

Frequently Asked Questions

What does eAG tell me that A1C doesn't?

eAG expresses the same information as A1C but in units that match your glucose meter (mg/dL or mmol/L). If your A1C is 7.0%, an eAG of 154 mg/dL is much easier to relate to — it's close to the numbers you see on your meter every day. The ADA introduced eAG specifically because many patients found A1C percentages hard to interpret without clinical context.

Is eAG the same as my CGM average?

Not exactly. eAG is calculated from your A1C using a formula, while your CGM average is measured directly from sensor readings. They often agree closely, but can differ — especially if your glucose variability is high, or if your A1C is affected by conditions like anemia or hemoglobin variants.

What eAG should I aim for?

The ADA target for most adults with diabetes is an A1C below 7.0%, which corresponds to an eAG below 154 mg/dL (8.6 mmol/L). Targets vary by individual — some people may have higher targets (e.g. elderly adults or those with hypoglycemia unawareness), while others may aim lower. Always set goals in consultation with your healthcare provider.

How is eAG different from fasting blood sugar?

Fasting blood sugar is a single snapshot taken after 8+ hours without eating — it only reflects glucose at one moment. eAG is an estimate of your average glucose across all times of day over 2–3 months. eAG captures post-meal highs, overnight lows, and everything in between, making it a more comprehensive picture of overall glucose control.

Why does my eAG seem higher than my meter readings?

Home glucose meters typically capture fasting or pre-meal readings, which tend to be lower than post-meal peaks. eAG represents the true average including those post-meal spikes, which is why it's often higher than what most people see on their meters day-to-day. If you only check fasting glucose, your meter average will underestimate your true 24-hour average.