Create 2 equal columns of grid items from an Advanced Custom Fields repeater field. The left column will contain more items if the number of results is an odd number.

ACF-2-Columns-Repeater-Field.php

<div class="row">

<?php 
	// ACF_REPEATER_FIELD_NAME Repeater
	if( get_field( 'ACF_REPEATER_FIELD_NAME' ) ):
	// Get number of items from the result
	$numItems = sizeof( get_field( 'ACF_REPEATER_FIELD_NAME' ) );
	// Divied by 2 and round up to distribute evenly between the columns
	$itemsPerColumn = round( $numItems/2 );
	// Intialize an iterator for displacing an odd number of results
	$itemNum = 0;
	
?>
	<!-- LEFT COLUMN DIV -->
	<div class="col-1-2">
	
	<?php 
		while( has_sub_field('ACF_REPEATER_FIELD_NAME') ): 
		$itemNum++;
	?>	
		
		<div class="item-wrapper">	
			<div class="item">
				<header>
					<h3><?php the_sub_field('item_title'); ?></h3>
					<h5><?php the_sub_field('item_subtitle'); ?></h5>
				</header>

				<div class="item-info">
					<p>
						<?php the_sub_field('item_description'); ?>
					</p>
				</div><!-- / item info -->
			</div><!-- / .item -->
		</div><!--/ item-wrapper -->
		
	
		<?php 
			// Close the left column div if the max is reached and open the second column div
			if($itemNum == $itemsPerColumn): 
		?>
			</div><!-- /col-1-2 LEFT COLUMN	-->
			<!-- RIGHT COLUMN DIV -->
			<div class="col-2-2">
		<?php endif; ?>

		<?php 
			// Close the right column when the end is reached
			if($itemNum == $numItems): 
		?>
			</div><!-- /col-2-2	-->
		<?php endif; ?>


	<?php endwhile; ?>
<?php endif; // ACF_REPEATER_FIELD_NAME ?>	

</div><!-- / .row -->