Typography on the web has become a point of focus for standards based developers recently. One of the key concepts that we can use within our sites is consistent line-height in CSS terms. If you think of a ruled notebook, the lines are all equal heights.

The concept is fairly straight forward but in practice can be confusing especially for a CSS newcomer. All sizing needs to be relative to the base size. This allows for easy scaling up or down while keeping the required spacing and layout consistent, this can be refereed to as an elastic layout. To allow this we need to specify measurements in percent or em. Em calculator save you the hassle of all of those calculations.

Requirements: -
Demo: http://www.jameswhittaker.com/blog/article/em-based…
License: License Free