What length range is spaghetti most commonly sold in today?

Spaghetti is most commonly sold today in lengths of 25–30 cm, or about 10–12 inches.

That size is a modern retail convention rather than an essential definition of spaghetti. The pasta itself is long, thin and solidly cylindrical, traditionally made from durum-wheat semolina and water. Manufacturers extrude the dough through dies, then dry the strands for packaging and storage.

Spaghetti was originally notably longer, but shorter lengths became more popular during the second half of the 20th century. The change made the pasta easier to package, transport, store and cook in domestic kitchens. The standard packet length is also convenient for common pots, although cooks sometimes break strands before boiling.

The name comes from Italian spago, meaning “string,” with spaghetti functioning as a diminutive. Thickness creates related forms: spaghettini is thinner, while spaghettoni is thicker. In Italy, spaghetti is commonly cooked al dente, meaning tender but still firm to the bite. The popular story that Marco Polo introduced pasta from China is generally treated as a myth; long dried pasta was already documented in Sicily before his travels.