Tiny Fluid Grid is an awesome web app, that can help you determine the grid system of your website in an interactive way. You can set the number of columns, gutter percentage, minimum and maximum width of your website’s layout, and can get a downloadable CSS for it.
tinyfluidgrid The happy & awesome way to build fluid grid based websites
Inspired by 1kbgrid.com. Developed with love by Girlfriend’s overconfident and pretty good looking team of web developers. Tiny Fluid Grid ships with a index.html with demo code, and the grid.css containing the CSS for the grid you created.