There are plenty of wine bottle sizes beyond the standard 750ml bottle you may be used to. Here's a breakdown of the many different wine size bottles on the market today.
187.5 ml Small or Split: This type of wine bottle is the smallest out there as it is typically used to serve one glass of champagne. This size is best suited for one person if you just want to enjoy one glass of wine.
375 ml Demi or Half: The Demi sized wine bottle is half of the common sized wine bottle which serves about three glasses of wine.
750 ml Standard: This serving size is the most common for wine bottles which comes out to about six glasses of wine. This would be any typical wine bottle that you buy at a liquor store or such.
1.5 L Magnum: The 1.5 L Magnum comes out to twice the size of what the common serving size is. When you calculate how many glasses you can get from this size, it comes out to 12 glasses, suitable for any type of large gathering.
3.0 L Double Magnum: By just looking at the serving size of the Double Magnum, you can tell that it is twice the size of the Magnum.
4.5 L Jeroboam: This serving size is equal to six common wine bottles and is perfect for a party if you get a couple of Jeroboams at this size.
4.5 L Rehoboam: This is similar to the Jeroboam in terms of serving size as it is 4.5 L, but it is used more for the sparkling wines.
6.0 L Imperial: This sized wine bottle is equal to two Double Magnums and is typically used more for large events such as wine tasting events where you have an abundant number of people.
9.0 L Salmanazar: A 9 L Salmanazar wine bottle is the same as a complete case of wine or a 12 pack of regular 750 ml wine bottles.
12.0 L Balthazar: A 12 L Balthazar is equal to two Imperials or about a full case and a half of wine bottles.
15.0 L Nebuchadnezzar: This serving size is just under two full cases of wine as it comes out to about 20 regular wine bottles or 750 ml bottles.
18.0 L Solomon: A Solomon at 18 L is two full cases of wine. It is also known as a Melchior.