Grid System Columns

1/1
1/2 1/2
1/3 1/3 1/3
1/4 1/4 1/4 1/4
5/12 7/12
1/3 2/3
1/4 3/4
2/12 10/12
1/12 11/12

Also you can use bootstrap grid system like : span1 to span12