The FBA Wizard fee calculator is powered by the official Amazon calculator (they are the best source of accurate calculations_, so if its' experiencing issues then our chrome extension will too.

You can check to see if Google Chrome is upto date by following these instructions: https://support.google.com/chrome/answer/95414?co=GENIE.Platform%3DDesktop&hl=en

Failing that, it will begin working on its own accord within a few minutes/hours when the glitch with the Amazon calculator is fixed.