How much 18oz is and a cup measure?

* 1 fluid ounce (fl oz) is equal to 29.574 milliliters (mL) or 0.029574 liters (L).

* 1 cup is equal to 8 fl oz or 236.59 mL or 0.23659 L.

Therefore, 18 fl oz is equal to 18 * 29.574 mL = 532.332 mL or 18 * 0.029574 L = 0.532332 L. Converting to cups, we have 532.332 mL / 236.59 mL/cup ≈ 2.247 cups or 0.532332 L/ 0.23659 L/cup ≈ 2.247 cups. Rounding to one decimal place, 18 fl oz is approximately 2.2 cups.