Chrome //
Extensions 
Chrome
Web store
select chrome_id_no,plugin_tag_line,plugin_name,plugin_icon,sitemap_url,oldvsnew_comment from final_chrome_totaldata_sept2022 where MATCH(plugin_name) AGAINST('+usd +unit +price' IN Boolean MODE) order by users desc
Amazon Price Per Unit
This extension shows the price per unit (once, pound, etc.) for Amazon items where it is not already shown.
Pangolin - Unit Price Comparison
Pangolin automatically calculates and sorts products by unit price (weight, volume, or count).
Tesco Sort by Price Per Unit
Sorts Tesco grocery products by price per unit, converting between different denominations
Sort by price per unit - Maltasupermarket.com
Enables the ability to sort by price per unit on maltasupermarket.com
BeerMenus.com Price-Per-Unit Calculator
Shows units of alcohol and price per unit on BeerMenus.com. See Options for license information.