Estimated Average Glucose Calculator

Advanced Estimated Average Glucose Converter

Patient / Profile label

Used in history and exported summaries for easier identification.

HbA1c (%) *

Typical clinical range: 4.0–14.0%. Use lab-confirmed values.

eAG value (optional for reverse calculation)

Use this to estimate HbA1c from an average glucose.

Target HbA1c (%) for comparison

Compare calculated eAG against individualized target (set by clinician).

Display & calculation options

Show eAG in mg/dL

Show eAG in mmol/L

Auto-add each calculation to history table

Remember history in this browser (local)

Toggle units, auto-logging, and local storage for repeated monitoring.

Quick HbA1c presets 6.5% 7.0% 8.0% 9.0%

Apply common targets instantly to compare real-world scenarios.

From HbA1c → eAG

eAG (mg/dL):

eAG (mmol/L):

From eAG → estimated HbA1c

Estimated HbA1c (%):

General eAG interpretation snapshot

< 114 mg/dL ≈ < 6.0%
114–154 mg/dL ≈ 6.0–7.0%
155–183 mg/dL ≈ 7.0–8.0%
> 183 mg/dL often above common targets

For education only. Targets must be individualized by qualified healthcare professionals.

Calculations History, CSV & PDF Export

#	Timestamp	Profile	Source	HbA1c (%)	eAG (mg/dL)	eAG (mmol/L)	Δ vs Target (mg/dL)	Note

Exported CSV/PDF is for record-keeping only and not a diagnostic report.

Example Estimated Average Glucose Table

HbA1c (%)	eAG (mg/dL)	eAG (mmol/L)	Typical Interpretation (educational)
5.5	111	6.17	Often within normal range for many individuals.
6.5	140	7.78	Common diagnostic threshold region; confirm with a professional.
7.0	154	8.56	Frequent target for many treated patients; individualized goals apply.
8.0	183	10.17	Above many recommended targets; may require therapy adjustment.

Formula Used

This calculator uses the internationally recognized ADAG relationship between glycated hemoglobin and estimated average glucose derived from continuous and self-monitoring data.

Primary equation (mg/dL): eAG = 28.7 × HbA1c − 46.7
Converted to mmol/L: eAG (mmol/L) = eAG (mg/dL) ÷ 18
Reverse estimation: HbA1c ≈ (eAG(mg/dL) + 46.7) ÷ 28.7

These equations are regression-based estimates, not exact personal measurements. Factors like hemoglobin variants, anemia, pregnancy, kidney or liver disease can affect accuracy.

How to Use This Calculator

Enter your laboratory-reported HbA1c (%) value in the input field.
Optionally, enter an average glucose value to estimate the corresponding HbA1c.
Set a target HbA1c to instantly see deviation in mg/dL.
Use quick preset buttons to compare common treatment goals and outcomes.
Select whether to display eAG in mg/dL, mmol/L, or both.
Keep “Auto-add” enabled to log each calculation into the history table below.
Enable “Remember history” to persist records locally in this browser only.
Use “Download CSV” or “Download PDF” to save or share calculation history.

Always consult your healthcare provider before making any treatment or monitoring changes.

Estimated Average Glucose Quick Reference Ranges

eAG (mg/dL)	eAG (mmol/L)	Approx. HbA1c (%)	Educational Comment
97	5.4	5.0	Typical for many people without diabetes.
126	7.0	6.0	Upper-normal or early risk zone; monitor trends closely.
154	8.6	7.0	Common treatment target; individualized goals still essential.
183	10.2	8.0	Elevated; consider therapy review with healthcare team.

HbA1c to eAG Comparison Examples

These worked examples help interpret how small HbA1c changes shift estimated average glucose and support clearer goal-setting discussions.

HbA1c 6.5% → eAG ≈ 140 mg/dL (7.8 mmol/L)
HbA1c 7.5% → eAG ≈ 169 mg/dL (9.4 mmol/L)
HbA1c 9.0% → eAG ≈ 212 mg/dL (11.8 mmol/L)
Reducing HbA1c from 9.0% to 7.0% lowers eAG by ≈ 58 mg/dL.

Using Estimated Average Glucose for Ongoing Monitoring

Estimated average glucose links quarterly HbA1c results with daily readings, helping patients visualize long-term patterns rather than isolated values.

Compare uploaded meter or sensor data against eAG for consistency.
Identify gaps where fasting readings look stable but post-meal values rise.
Use history table exports to review progress across clinic visits.
Highlight whether lifestyle or medication changes improved long-term exposure.

Limitations and Safety Notes for Estimated Average Glucose

Estimated average glucose is informative but not a substitute for individualized medical evaluation or real-time glucose monitoring.

Equation may be less accurate with hemoglobin disorders or anemia.
Pregnancy and rapid glucose shifts can uncouple HbA1c from actual averages.
Chronic kidney or liver disease may distort interpretation.
Always correlate results with professional guidance and symptom review.