To determine your A1C if your average blood sugar is 140, you can use the eAG/A1C conversion calculator provided by the American Diabetes Association. The calculator uses the formula 28.7 x A1C - 46.7 = eAG to convert between A1C and estimated average glucose (eAG). Rearranging the formula to solve for A1C, we get:

A1C = (eAG + 46.7) / 28.7

Plugging in an eAG of 140, we get:

A1C = (140 + 46.7) / 28.7 = 6.0

Therefore, if your average blood sugar is 140, your estimated A1C is 6.0. Its important to note that this is an estimate and not a substitute for an actual lab A1C result. You should discuss your A1C results with your healthcare provider to gain a better understanding of your overall diabetes management plan.