A Chrome extension that tracks how far you've scrolled and displays it as real-world distances
You can install it from the Chrome Web Store at https://chrome.google.com/webstore/detail/scroll-miles/clembmegdbjahnkadhogeldgfdjjljme, or you can download the folder, go to chrome:https://extensions in your browser, enable developer mode, click "Load Unpacked" and select the folder.
Also while working on ScrollMiles I made this if you want to try it, https://nullfoo.me/scrollspeed.html it detects scroll speed