How are Sparkling Wines Classified?

Brut-Naturale:
0-3 gram of sugar per liter

Extra-Brut:
0-6 gram of sugar per liter (the driest of the dry, unsweetened)


Brut:
less than 15 gram of sugar per liter (dry, this is the typical style of Champagne with no sweetness)

Extra-Dry:
12-20 gram of sugar per liter (still dry with a hint of sweetness or slightly sweet)

Sec:
17-35 gram of sugar per liter (medium sweet)

Demi-Sec:
33-55 gram of sugar per liter (sweet)

Doux:
more than 55 gram of sugar per liter (Sweetest, very rare and is considered as dessert wine)