Zurb Foundation Sass Code - More Dynamic, grid will adjust based on the number of columns and gutter size

_grid.sass

// .sass syntax

// NOTE: This Sass stylesheet is dependent on the Custom Sass Function, convert-number-to-word, 
//       which is available here, https://gist.github.com/1439296


/* Arfully Masterminded by ZURB
/* Grid :: This is the mobile-friendly, responsive grid that lets Foundation work much of its magic.

// Using Default Number of Columns that Foundation starts off with, 12 columns
$grid-max-width: 980px
$grid-min-width: 727px
$number-of-columns: 12

$number-of-gutters: $number-of-columns - 1
$gutter-width: 4.4%
$column-width: (100% - $gutter-width * $number-of-gutters) / $number-of-columns * 1

.container
  padding: 0 20px

// To set the grid to a certain size, set max-width to width
.row
  width: 100%
  max-width: $grid-max-width
  min-width: $grid-min-width
  margin: 0 auto
  .row
    min-width: 0px

.column, .columns
  margin-left: 4.4%
  float: left
  min-height: 1px
  position: relative
  &:first-child
    margin-left: 0

.row
  /* .one.columns, .two.columns, etc. - more stuff
  @for $i from 1 through $number-of-columns
    .#{convert-number-to-word($i)}.columns
      @if $i == 1
        width: $column-width * $i
      @else
        width: $column-width * $i + $gutter-width * $i - $gutter-width
  /* .offset-by-one, .offset-by-two, etc.
  @for $i from 1 through $number-of-columns - 2
    .offset-by-#{convert-number-to-word($i)}
      margin-left: $column-width * ($i + 1) + $gutter-width * ($i + 1) - $gutter-width + 0.1%
      &:first-child
        margin-left: $column-width * ($i + 1) + $gutter-width * ($i + 1) - $gutter-width + 0.1% - $gutter-width
  // Source Ordering
  /* Push Ordering
  @for $i from 2 through $number-of-columns - 2
    .push-#{convert-number-to-word($i)}
      left: $column-width * ($i + 1) + $gutter-width * ($i + 1) - $gutter-width + 0.1% - $gutter-width
  /* Pull Ordering
  @for $i from 2 through $number-of-columns - 2
    .pull-#{convert-number-to-word($i)}
      right: $column-width * ($i + 1) + $gutter-width * ($i + 1) - $gutter-width + 0.1% - $gutter-width
  /* .one.centered, .two.centered, etc.
  @for $i from 1 through $number-of-columns
    .#{convert-number-to-word($i)}.centered
      width: $column-width * $i + $gutter-width * $i - $gutter-width
      margin: 0 auto

img, object, embed
  max-width: 100%
  height: auto

img
  -ms-interpolation-mode: bicubic

#map_canvas img, .map_canvas img
  max-width: none !important

/* Nicolas Gallagher's micro clearfix
.row:before, .row:after, .clearfix:before, .clearfix:after
  content: ""
  display: table

.row:after, .clearfix:after
  clear: both

.row, .clearfix
  zoom: 1

// Blockgrids
//----------------------------------------------------------------------------------------------------

// Notes:
//
//    These are 2-up, 3-up, 4-up and 5-up ULs suited for repeating blocks of content.
//    Add 'mobile' to them to switch them just like the layout grid (one item per line) on phones
//
//    For IE7/8 compatibility, block-grid items need to be the same height.
//    To support arbitrary height, set $support-block-grid-nth-child to true
//    Just know that IE7/8 do not support :nth-child

.block-grid
  display: block
  overflow: hidden
  & > li
    display: block
    height: auto
    float: left
  &.two-up
    margin-left: -4%
    & > li
      margin-left: 4%
      width: 46%
      @if $support-block-grid-nth-child
        &:nth-child(2n+1)
          clear: left
  &.three-up
    margin-left: -2%
    & > li
      margin-left: 2%
      width: 31.3%
      @if $support-block-grid-nth-child
        &:nth-child(3n+1)
          clear: left
  &.four-up
    margin-left: -4%
    & > li
      margin-left: 4%
      width: 23%
      @if $support-block-grid-nth-child
        &:nth-child(4n+1)
          clear: left
  &.five-up
    margin-left: -1.5%
    & > li
      margin-left: 1.5%
      width: 18.5%
      @if $support-block-grid-nth-child
        &:nth-child(5n+1)
          clear: left

_grid.scss

// .scss syntax

// NOTE: This Sass stylesheet is dependent on the Custom Sass Function, convert-number-to-word, 
//       which is available here, https://gist.github.com/1439296

/* Arfully Masterminded by ZURB */
/* Grid :: This is the mobile-friendly, responsive grid that lets Foundation work much of its magic. */

// Using Default Number of Columns that Foundation starts off with, 12 columns
$grid-max-width: 980px;
$grid-min-width: 727px;
$number-of-columns: 12; 

$number-of-gutters: $number-of-columns - 1;
$gutter-width: 4.4%;
$column-width: ((100% - ($gutter-width * $number-of-gutters))/$number-of-columns) * 1;


.container {
  padding: 0 20px; }

// To set the grid to a certain size, set max-width to width
.row {
  width: 100%;
  max-width: $grid-max-width;
  min-width: $grid-min-width;
  margin: 0 auto;
  .row {
    min-width: 0px; } }

.column, .columns {
  margin-left: 4.4%;
  float: left;
  min-height: 1px;
  position: relative;
  &:first-child {
    margin-left: 0; } }


.row {
  /* .one.columns, .two.columns, etc. - more stuff */
  @for $i from 1 through $number-of-columns {
    .#{convert-number-to-word($i)}.columns { 
      @if $i == 1 {
        width: $column-width * $i;
      } @else {
        width: ($column-width * $i) + ($gutter-width * $i) - $gutter-width;
      } 
    }
  }
  
  /* .offset-by-one, .offset-by-two, etc. */ 
  @for $i from 1 through ($number-of-columns - 2) {
    .offset-by-#{convert-number-to-word($i)} {
      margin-left: (($column-width * ($i+1)) + ($gutter-width * ($i+1)) - $gutter-width) + 0.1%;
      &:first-child {
        margin-left: ((($column-width * ($i+1)) + ($gutter-width * ($i+1)) - $gutter-width) + 0.1%) - $gutter-width;
      }
    }
  }
  
  // Source Ordering
  /* Push Ordering */
  @for $i from 2 through ($number-of-columns - 2) {
    .push-#{convert-number-to-word($i)} {
      left: ((($column-width * ($i+1)) + ($gutter-width * ($i+1)) - $gutter-width) + 0.1%) - $gutter-width;
    }
  }
  
  /* Pull Ordering */
  @for $i from 2 through ($number-of-columns - 2) {
    .pull-#{convert-number-to-word($i)} {
      right: ((($column-width * ($i+1)) + ($gutter-width * ($i+1)) - $gutter-width) + 0.1%) - $gutter-width;
    }
  }

  /* .one.centered, .two.centered, etc. */ 
  @for $i from 1 through $number-of-columns {
    .#{convert-number-to-word($i)}.centered { 
      width: ($column-width * $i) + ($gutter-width * $i) - $gutter-width;
      margin: 0 auto;
    }
  }
}


img, object, embed {
  max-width: 100%;
  height: auto; }

img {
  -ms-interpolation-mode: bicubic; }
  
#map_canvas img, .map_canvas img {
  max-width: none !important; }

/* Nicolas Gallagher's micro clearfix */
.row:before, .row:after, .clearfix:before, .clearfix:after {
  content: "";
  display: table; }

.row:after, .clearfix:after {
  clear: both; }

.row, .clearfix {
  zoom: 1; }

// Blockgrids
//----------------------------------------------------------------------------------------------------

// Notes:
//
//    These are 2-up, 3-up, 4-up and 5-up ULs suited for repeating blocks of content.
//    Add 'mobile' to them to switch them just like the layout grid (one item per line) on phones
//
//    For IE7/8 compatibility, block-grid items need to be the same height.
//    To support arbitrary height, set $support-block-grid-nth-child to true
//    Just know that IE7/8 do not support :nth-child

.block-grid {
  display: block;
  overflow: hidden;
  & > li {
    display: block;
    height: auto;
    float: left; }
  &.two-up {
    margin-left: -4%;
    & > li {
      margin-left: 4%;
      width: 46%;
      @if $support-block-grid-nth-child {
        &:nth-child(2n+1) {
          clear: left; } } } }
  &.three-up {
    margin-left: -2%;
    & > li {
      margin-left: 2%;
      width: 31.3%;
      @if $support-block-grid-nth-child {
        &:nth-child(3n+1) {
          clear: left; } } } }
  &.four-up {
    margin-left: -4%;
    & > li {
      margin-left: 4%;
      width: 23%;
      @if $support-block-grid-nth-child {
        &:nth-child(4n+1) {
          clear: left; } } } }
  &.five-up {
    margin-left: -1.5%;
    & > li {
      margin-left: 1.5%;
      width: 18.5%;
      @if $support-block-grid-nth-child {
        &:nth-child(5n+1) {
          clear: left; } } } } }