There aren't any built-in tools for this, but there's an excellent third party tool available called Universal Filter that can be added to Squarespace.
Again, this isn't a built-in feature. Squarespace requires you to sell products by quantity (a specific number of tiles, not a square meterage) so the built in price and units will refer to individual tiles or packs of tiles, not square metres. I haven't seen any third party solutions specific to Squarespace, but it should be possible for a developer to write some custom code to convert one to the other.
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