You can change the WooCommerce price to be by weight by appending some text after the actual price such as ‘per kg’, this can be done by manipulating 3 filters that display the price in the shop/product page, cart and checkout pages;


If all items were to be classified as ‘per kg‘ you could use the filters as below…

In the checkout filter I dropped the ‘per kg’ and just left ‘kg’ as the unit price is not used rather the total price.

woocommerce-checkout-weight woocommerce-by-weight



If you need more variations on the weight or to use a per item/unit options consider using ACF with a select field that can easily be changed per product.



  1. Brì on September 15, 2018 at 3:20 pm

    What if I need to sell some products by weight but some other by unit?
    Thank you!

    • Neil Gowran on September 15, 2018 at 11:45 pm

      You could selectively choose products or product categories with conditional logic

      • Brì on September 16, 2018 at 10:04 am

        Hi Neil and thank you very much for your help! I will study this and try to do it by myself!
        Have a nice day!

      • Brì on September 16, 2018 at 10:27 am

        Hi Neil, sorry again. I’ve tried to edit the code you wrote up with an easy

        is_product_category( ‘shirts’ ) {}

        but it doesn’t work. I’m in the shop page or in the single product page but not in the archive of category. So I should be able to say to it that I’m speaking about the single category of the single product… Any advice?
        Really thank you for your time, it’s a huge help!

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