The Max/Completionist Cape Calculator is a RuneScape tool that will help you figure out just how far (or close) you are from maxing your skills. It does this by using your stats in the hiscores. This means, unfortunately, that those not in the hiscores will not be able to be calculated.
Due to a lack of developer tools from RuneScape, it's not possible to track other Completionist requirements. You can do so yourself, however, by creating a profile. Creating a profile is not required to use the Calculator, but it does give you access to some cool features, including: keeping track of your Regular and Trimmed Completionist Cape requirements, setting checkpoints in your skills (displays experience gained since that date on your Calculator page), and just having a cool profile page to share!
You can set a default name on your calculator page by hitting the button to the left of the search bar. This will make it so you can skip past this page in the future and get straight to your calculator.
Thank you for all your support and feedback. I couldn't have gotten this far without you!