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They are required in the US. Apparently, requiring specific units would be onerous.

The units are SI in the UK, but retailers appear be allowed to mix and match. This is particularly noticeable with milk in Tesco, at least last I looked - the price of the 1pt and 2pt milk cartons were priced in pence/100ml (~£0.09/100ml, I think), and the 2L+ ones were priced at £/L - ~£0.55/L ;)

I now buy the 2L cartons...

I often see the following in the UK that appears to work around this.

Fruit items in a pack (e.g. 6 oranges) - price per unit is shown.

Fruit items loose - price per weight shown.

So you can't compare which is cheaper. I assume loose...

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