There are exactly 750 millimeters in a 75cl bottle. A bottle of this volume is the international commercial standard for all varieties of wine.
The volume of the standard wine bottle is today measured using the metric system. The measurement is often given in milliliters, abbreviated “ml,” meaning one-thousandth of a liter. A centiliter, abbreviated “cl,” means one-hundredth of a liter. Thus, the centiliter is 10 times the volume of the milliliter and can be calculated by merely dividing a given number of milliliters by 10. A 75cl bottle holds roughly .264 US gallons. The United States adopted the metric measurements for wine in the 1970s.