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    <p>If <strong>css3</strong> is an option, this can be done using the css <code>calc()</code> function.</p> <h2>Case 1: Justifying boxes on a single line ( <a href="http://jsfiddle.net/danield770/3ngvz/3/" rel="nofollow noreferrer">FIDDLE</a> )</h2> <p>Markup is simple - a bunch of divs with some container element.</p> <p>CSS looks like this:</p> <pre><code>div { height: 100px; float: left; background:pink; width: 50px; margin-right: calc((100% - 300px) / 5 - 1px); } div:last-child { margin-right:0; } </code></pre> <p>where <em>-1px</em> to fix an IE9+ calc/rounding bug - see <a href="https://stackoverflow.com/q/16658482/703717"><strong>here</strong></a></p> <h2>Case 2: Justifying boxes on multiple lines ( <a href="http://jsfiddle.net/danield770/Vfffg/16/" rel="nofollow noreferrer">FIDDLE</a> )</h2> <p>Here, in addition to the <code>calc()</code> function, <code>media queries</code> are necessary.</p> <p>The basic idea is to set up a media query for each #columns states, where I then use calc() to work out the margin-right on each of the elements (except the ones in the last column).</p> <p>This sounds like a lot of work, but if you're using LESS or SASS this can be done quite easily </p> <p>(It can still be done with regular css, but then you'll have to do all the calculations manually, and then if you change your box width - you have to work out everything again)</p> <p>Below is an example using LESS: (You can copy/paste this code <a href="http://less2css.org/" rel="nofollow noreferrer"><strong>here</strong></a> to play with it, [it's also the code I used to generate the above mentioned fiddle])</p> <pre><code>@min-margin: 15px; @div-width: 150px; @3divs: (@div-width * 3); @4divs: (@div-width * 4); @5divs: (@div-width * 5); @6divs: (@div-width * 6); @7divs: (@div-width * 7); @3divs-width: (@3divs + @min-margin * 2); @4divs-width: (@4divs + @min-margin * 3); @5divs-width: (@5divs + @min-margin * 4); @6divs-width: (@6divs + @min-margin * 5); @7divs-width: (@7divs + @min-margin * 6); *{margin:0;padding:0;} .container { overflow: auto; display: block; min-width: @3divs-width; } .container &gt; div { margin-bottom: 20px; width: @div-width; height: 100px; background: blue; float:left; color: #fff; text-align: center; } @media (max-width: @3divs-width) { .container &gt; div { margin-right: @min-margin; } .container &gt; div:nth-child(3n) { margin-right: 0; } } @media (min-width: @3divs-width) and (max-width: @4divs-width) { .container &gt; div { margin-right: ~"calc((100% - @{3divs})/2 - 1px)"; } .container &gt; div:nth-child(3n) { margin-right: 0; } } @media (min-width: @4divs-width) and (max-width: @5divs-width) { .container &gt; div { margin-right: ~"calc((100% - @{4divs})/3 - 1px)"; } .container &gt; div:nth-child(4n) { margin-right: 0; } } @media (min-width: @5divs-width) and (max-width: @6divs-width) { .container &gt; div { margin-right: ~"calc((100% - @{5divs})/4 - 1px)"; } .container &gt; div:nth-child(5n) { margin-right: 0; } } @media (min-width: @6divs-width){ .container &gt; div { margin-right: ~"calc((100% - @{6divs})/5 - 1px)"; } .container &gt; div:nth-child(6n) { margin-right: 0; } } </code></pre> <p>So basically you first need to decide a box-width and a minimum margin that you want between the boxes.</p> <p>With that, you can work out how much space you need for each state.</p> <p>Then, use calc() to calcuate the right margin, and nth-child to remove the right margin from the boxes in the final column.</p> <p>The <strong>advantage</strong> of this answer over the accepted answer which uses <code>text-align:justify</code> is that when you have more than one row of boxes - the boxes on the final row don't get 'justified' eg: If there are 2 boxes remaining on the final row - I don't want the first box to be on the left and the next one to be on the right - but rather that the boxes follow each other in order.</p> <p>Regarding <strong>browser support</strong>: This will work on IE9+,Firefox,Chrome,Safari6.0+ - (see <a href="http://caniuse.com/#search=calc" rel="nofollow noreferrer"><strong>here</strong></a> for more details) <strike>However i noticed that on IE9+ there's a bit of a glitch between media query states. [if someone knows how to fix this i'd really like to know :) ] </strike> &lt;-- FIXED <a href="https://stackoverflow.com/q/16658482/703717">HERE</a></p>
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