If you take a look at this online Swedish grocery store where I searched for pasta [0], you can see the price for each product but also the cost per kg ("jmf pris"):

* Jmf pris 21:27 /kg

* Jmf pris 38:55 /kg

* Jmf pris 16:95 /kg

[0] https://www.mathem.se/sok?q=snabbmakaroner&page=1&pageSize=4...