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A simple tool to help build responsive websites

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Octocat-spinner-32 js
Octocat-spinner-32 styles
Octocat-spinner-32 .gitignore
Octocat-spinner-32 404.html
Octocat-spinner-32 CNAME
Octocat-spinner-32 index.html


A simple tool to help build responsive websites

This is a simple tool to help developers convert fixed pixel widths to percentages. A use-case would be, being handed a typical desktop-sized design, but being told it should be responsive and fluid. Put in the widths of the main columns into the app and get back the percentages.


  • CSS was done in LESS. I'll convert it to raw CSS soon so it's easy to add to and work on.
  • It's fully responsive, naturally.
  • I've added crude timestamps onto the CSS and JS refrences for cache busting. Better techniques welcome.
  • Only needs to support good browsers. I'm not bothered about IE, I'm sure developers won't be IE users anyway.


  • Convert LESS to CSS
  • Clean up (hasitlly written) JavaScript
  • Account for guttering


  • The 404.html is an exact clone of index.html. It's required so that linking to calculations don't throw errors in GitHub pages.
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