Display menu items with equal widths

If you’d like all your menu items to be the same size, you use a percentage as the width. If you have 4 menu items, you set the width of each menu item to be 25% in your CSS.

But what if you add another menu item? The fifth one drops to another line since it doesn’t fit. You could use Javascript to count and resize them, but then you’d get a flash of unstyled content while the Javascript waits for the page to finish loading.

Or, you can use the built-in WordPress filters to do it. We’re using the nav_menu_css_class filter to customize the classes on the menu items.

* Equal Sized Menu Items
* @author Bill Erickson
* @link http://www.billerickson.net/menu-item-equal-widths/
* @param array $classes, current menu classes
* @param object $item, current menu item
* @param object $args, menu arguments
* @return array $classes
function be_equal_sized_menu_items( $classes, $item, $args ) {
// Only run on the header menu
if( 'header' !== $args->theme_location )
return $classes;
// Only run on top level menu items
if( $item->menu_item_parent )
return $classes;
// Grab all menu items
$menu_items = wp_get_nav_menu_items( $args->menu->term_id );
// Remove submenu items
foreach( $menu_items as $i => $menu_item )
if( $menu_item->menu_item_parent )
unset( $menu_items[$i] );
// Count all top level items, and add as a class
$classes[] = 'count-' . count( $menu_items );
return $classes;
add_filter( 'nav_menu_css_class', 'be_equal_sized_menu_items', 10, 3 );
view raw functions.php hosted with ❤ by GitHub
.genesis-nav-menu .menu-item.count-2 {
width: 50%;
.genesis-nav-menu .menu-item.count-3 {
width: 33.3333%;
.genesis-nav-menu .menu-item.count-4 {
width: 25%;
.genesis-nav-menu .menu-item.count-5 {
width: 20%;
.genesis-nav-menu .menu-item.count-6 {
width: 16.666666667%;
.genesis-nav-menu .menu-item.count-7 {
width: 14.285714286%;
.genesis-nav-menu .menu-item.count-8 {
width: 12.5%;
.genesis-nav-menu .menu-item.count-9 {
width: 11.111111111%;
.genesis-nav-menu .menu-item.count-10 {
width: 10%;
view raw style.css hosted with ❤ by GitHub

First I make sure that this is the ‘header’ menu location, since that’s the only menu I want to affect. I also make sure this is a top level menu item (I don’t want my submenus affected). I use wp_get_nav_menu_items() to get a list of all menu items in the menu, filter this list down to only top level menu items, count them up and add it as a class to the menu item.

So if you have 4 menu items, each one will have a class of “count-4”. If you add another menu item, they all will have a class of “count-5”. The CSS styles all the different variations: count-4 is 25% wide, count-5 is 20% wide…

This will work with any WordPress theme. Since I use Genesis, my CSS targets the .genesis-nav-menu. If you use a different theme just update this to match whatever class your nav menus have.

Bill Erickson

Bill Erickson is a freelance WordPress developer and a contributing developer to the Genesis framework. For the past 14 years he has worked with attorneys, publishers, corporations, and non-profits, building custom websites tailored to their needs and goals.

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