On a default WooCommerce install, we add X products to cart by defining the add to cart quantity on the single product page.
But what if your shop sells spices? It’s likely that those quantities are actually pounds / kilograms / or whatever weight unit you require. And what if your WooCommerce business is entirely focused around Italian extra virgin olive oil (asking for a friend!), that you’d sell per liter?
In such custom cases, it’s nice to specify the unit beside the add to cart quantity, so that customers know how much and what they are buying. So, let’s see how to add an add to cart quantity suffix beside the quantity input field on the single product page. Enjoy!

PHP Snippet: Add to Cart Quantity Input Suffix @ WooCommerce Single Product Page
/**
* @snippet Quantity Suffix @ WooCommerce Single Product
* @how-to businessbloomer.com/woocommerce-customization
* @author Rodolfo Melogli, Business Bloomer
* @compatible WooCommerce 7
* @community https://businessbloomer.com/club/
*/
add_action( 'woocommerce_after_quantity_input_field', 'bbloomer_echo_qty_front_add_cart' );
function bbloomer_echo_qty_front_add_cart() {
echo '<span class="qty-suff">liters</span>';
}
Hey Rodolfo,
I hope you are doing well.
Thank you so much for your tutorial. I have a similar scenario that I am trying to overcome. I just want to add the Cart Quantity Input Suffix on a single product/category. One of my clients sells cable by the meter and it is just this particular product that I want to change the suffix to ‘meters’. They ell other items y the qty so it is just this one product/category that is sold by the meter.
Is this possible?
Thanks in advance,
Kingsley
Hi Rodolfo,
Would you have a solution to my query below please?
One of my clients sells cable by the meter and it is just this particular product that I want to change the suffix to ‘meters’. They sell other items so the suffix ‘qty’ is OK for those products so it is just this one product/category that is sold by the meter.
Thank you
Hey Kingsley! I suggest you take a look at “conditional logic”: https://businessbloomer.com/woocommerce-conditional-logic-ultimate-php-guide/. Let me know