I know they cut out approximately 85% but how big on average is the stomach left?

My surgeon said 75% so not sure.

I thought it was about the size and shape of a small banana.

My surgeon said 75% as well.

I have heard the banana reference too think I will ask at next appointment just curious and surprised I didn't ask. I have heard with gastric it's the size of your thumb.

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Most are correct in saying the shape of a banana, not a "thumb"(it is not the gastric bypass) and remember that it does not stretch so yes a banana it is. For anyone that had the barium swallow you would have seen it on the xray machine as the liquid flowed through it.

My doc said it can hold approximately 6 ounces.