A1c Eag Calculator
Your lab report says your A1C is 7.0%. Your glucose meter speaks in mg/dL. How do those two numbers relate? The A1C eAG Calculator above bridges that gap instantly: enter your A1C percentage and it converts it to your estimated average glucose (eAG) — the average blood sugar level your A1C corresponds to — shown in both mg/dL and mmol/L. One number in, and your lab result suddenly speaks the same language as your daily meter readings.
The A1C test measures the percentage of your hemoglobin coated with sugar, reflecting your average blood glucose over the previous two to three months. But percentages are abstract; most people manage diabetes in mg/dL (or mmol/L outside the US), checking fasting and post-meal readings daily. The eAG translation, derived from a landmark clinical study, lets you compare your lab result directly against the numbers you see every morning.
How to Use This Calculator
1. Enter your A1C percentage. Find it on your lab report (for example, 7.0) and type it in — decimals are fine.
2. Press Calculate. Your estimated average glucose appears instantly in mg/dL, plus the mmol/L equivalent used in most countries outside the US.
3. Compare with your meter average. Check whether your home readings’ average roughly matches the eAG — big gaps are worth discussing with your clinician.
4. Press Reset to convert another value. Handy when comparing an old result with a new one.
Worked Example
Take an A1C of 7.0%, a common treatment target for many adults with diabetes:
– eAG = 28.7 × 7.0 − 46.7 = 154.2 mg/dL
– In mmol/L: 154.2 ÷ 18 = 8.6 mmol/L (rounded)
So an A1C of 7.0% means your blood sugar averaged about 154 mg/dL over the past few months. For context, an A1C of 5.7% — the threshold for prediabetes concern — converts to about 116.9 mg/dL. Small A1C changes represent meaningful average-glucose shifts: each 1% of A1C equals roughly 29 mg/dL of average glucose.
More Helpful Information
The conversion eAG (mg/dL) = 28.7 × A1C − 46.7 comes from the ADAG (A1C-Derived Average Glucose) study, which paired thousands of glucose measurements with A1C results across diverse patients. It’s a population-average relationship — your personal correspondence may differ slightly — but it’s the standard translation endorsed by major diabetes organizations.
Use it to sanity-check your meter habits. If your meter average is 130 mg/dL but your eAG is 170, you may be missing high readings (overnight or post-meal spikes you never test). Track the trend, not just one number. Falling eAG over successive A1C tests confirms your plan is working, even when daily readings feel noisy.
Frequently Asked Questions
1. What is eAG?
Estimated average glucose: the average blood sugar level (in mg/dL or mmol/L) that corresponds to your A1C percentage, calculated from the ADAG study formula.
2. What is the formula to convert A1C to eAG?
eAG (mg/dL) = 28.7 × A1C − 46.7. For mmol/L, divide the result by 18.
3. What eAG corresponds to an A1C of 7%?
About 154 mg/dL, or 8.6 mmol/L.
CONCLUSION
A1C percentages and glucose readings are two dialects of the same language, and eAG is the translator. Plug your lab result into the calculator above, see your average in the units you actually use every day, and let that number inform — not replace — the conversation with your care team. Understanding what your A1C really means is the first step toward moving it in the right direction.