Progresar - Reading Progress for WordPress
Progresar is a compact WordPress plugin designed to generate a progress bar indicating your scrolling progress on a website.

Features
Get more conversion with more out of concept.
Progress bar’s height
Progress bar height set as your webpage is required
Customable
All settings can customizable from option page
Foreground color
You can change color based on your theme color
Position
You can set custom position as you needed.