There are 10 widely used wine bottle sizes with names that may be confusing if you are unfamiliar with them:

wine bottle sizes

Piccolo or Split: 187.5 ml
Demi or Half: 375 ml
Standard: 750 ml
Magnum: 1.5 litres
Double Magnum: 3.0 litres
Jeroboam: 4.5 litres
Imperial: 6.0 litres
Salmanazar: 9.0 litres
Balthazar: 12 litres
Nebuchadnezzar: 15 litres