A1C Calculator

Convert A1C to estimated average glucose and back with standard formulas.

Key formula

eAG = 28.7 x A1C - 46.7

About this tool

A1C and estimated average glucose are two ways to describe blood sugar patterns over time. This calculator helps users translate between the lab percentage and more familiar glucose-style numbers, making the result easier to interpret in context.

How to use this calculator

1. Enter realistic personal values and double-check the chosen unit system before calculating.
2. Use the result as a planning estimate, not as a diagnosis or guaranteed outcome.
3. Compare the output with your goal, context, and any relevant professional guidance.
4. Review the steps to understand how the estimate was produced from your inputs.