Water & volume converter

One US cup is about 236.6 ml, and one US fluid ounce is about 29.57 ml, so a cup is 8 fluid ounces. A metric cup, used in some countries, is exactly 250 ml.

One liter is about 33.8 US fluid ounces, or roughly 4.2 US cups. In milliliters, a liter is exactly 1,000 ml.

This converter uses US customary units: 1 cup is 236.6 ml and 1 fluid ounce is 29.57 ml. UK (imperial) fluid ounces are slightly smaller at about 28.41 ml, so results differ a little if you use imperial measures.

If a glass is counted as 8 fluid ounces (about 240 ml), then 8 glasses is roughly 1.9 liters, or about 64 fluid ounces. Glass sizes vary, so the exact total depends on how big your glass is.