A1C to eAG Calculator

How to Use A1C to Average Blood Sugar

1. Enter your A1C percentage. Type the value from your lab report, e.g., 6.5. The tool will instantly compute your estimated average glucose (eAG).
2. Or enter an eAG value. If you know your average glucose in mg/dL from a continuous glucose monitor, type it in the eAG field to reverse‑calculate your A1C.
3. Check the mmol/L equivalent. The eAG in mmol/L appears automatically below the mg/dL field for those who use international units.
4. Review the full table. The on‑page table maps A1C values from 5% to 12% to their corresponding eAG and category, so you can see where your number falls on the diabetes spectrum.

Benefits of A1C to Average Blood Sugar

• Converts both ways — A1C to eAG and eAG back to A1C — using the ADAG formula (eAG = 28.7 × A1C − 46.7).
• Shows the diabetes category (normal, prediabetes, diabetes) for each result, providing immediate clinical context.
• The comprehensive table eliminates the need to repeatedly calculate values for different A1C percentages.
• Operates entirely in your browser, keeping your lab data private and offline.

Frequently Asked Questions

What is the difference between A1C and a finger‑stick glucose test?

A finger‑stick measures your blood sugar at a single moment. A1C reflects your average blood sugar over the past 2–3 months by measuring the percentage of glucose‑coated haemoglobin in your red blood cells.

What A1C level indicates diabetes?

An A1C of 6.5% or higher on two separate tests is diagnostic for diabetes. Values between 5.7% and 6.4% indicate prediabetes. Below 5.7% is considered normal.

Can A1C be inaccurate in some conditions?

Yes. Conditions like anaemia, kidney disease, or certain haemoglobin variants can make A1C less reliable. Always discuss the results with your doctor, who may order additional tests.

Is A1C to Average Blood Sugar free and private?

Yes — it is 100% free, needs no sign‑up, and everything runs in your browser; your data never leaves your device.