Query with a meta value inside a given range

In this situation you will want to use the meta_query parameter, an example:

$args = array(
    'post_type'   => 'page',
    'post_status' => 'publish',
    'meta_query'  => array(
        array(
            'key'     => $key,
            'value'   => array($min, $max),
            'compare' => 'BETWEEN',
        ),
    ),
);

$query = new WP_Query( $args );

The possible values for for the ‘compare’ key are:

• “=”
• “!=”
• “>”
• “>=”
• “<“
• “<=”
• “LIKE”
• “NOT LIKE”
• “IN”
• “NOT IN”
• “BETWEEN”
• “NOT BETWEEN”
• “EXISTS” (only in WP >= 3.5)
• “NOT EXISTS” (only in WP >= 3.5)
• “REGEXP” (only in WP >= 3.7)
• “NOT REGEXP” (only in WP >= 3.7)
• “RLIKE” (only in WP >= 3.7)

Default value is “=”.

Useful reading:

• https://developer.wordpress.org/reference/classes/wp_query/#custom-field-post-meta-parameters
• https://developer.wordpress.org/reference/classes/wp_meta_query/