18 Ounces to Cups

18 fl oz = 2.25 cup

Calculation: cup = 18 fl oz × 0.125 = 2.25 cup

Ounce to Cup Converter

Choose the type of measurement to convert
Select the source unit to convert from
Select the target unit to convert to
Enter a numeric value or fraction to convert
Sig. Figures:

How much is 18 fl oz?

532 mL (18 fl oz) is about a standard wine bottle (750 mL / 25.4 fl oz).

What does 18 fl oz look like?

Illustration of a wine bottle
532 mL (18 fl oz) is about a standard wine bottle (750 mL / 25.4 fl oz).

18 fl oz on the cup scale

fl oz01020304050cup0123456

18 fl oz = 2.25 cup

Did you know? Water bottle (standard) is 500 mL.

The standard single-serve water bottle is 500 mL (16.9 fl oz), half a liter.

How to Convert Ounce to Cup

1 ounce = 18 cups

Cup = Ounce × 18

Example: 18 fl oz × 18 = 2 14 cup

Reverse Conversion

To convert cups back to ounces:

  • Remember, 1 cup equals 8 ounces.
  • To convert 2 14 cup to fl oz, multiply 2 14 x 8, resulting in 18 fl oz.

18 fl oz is also equal to:

Frequently Asked Questions

How much is 18 ounces in cups?

18 ounces equals 2.25 cups. This is calculated by multiplying 18 by the conversion factor 0.125.

What does 18 ounces look like in cups?

18 ounces (2.25 cups) is a pint to a quart — a large glass or a small bottle.

How do you calculate 18 ounces to cups?

Multiply 18 by the conversion factor 0.125. The calculation is 18 × 0.125 = 2.25 cups. This factor is defined by international measurement standards.

Share This Calculation

18 ounces = 2.25 cups
18 ounces = 2.25 cups — conversion chart

Nearby Conversions

2 ounces0.25 cups 6 ounces0.75 cups 10 ounces1.25 cups 14 ounces1.75 cups 22 ounces2.75 cups 26 ounces3.25 cups 30 ounces3.75 cups 34 ounces4.25 cups 38 ounces4.75 cups 42 ounces5.25 cups 46 ounces5.75 cups 50 ounces6.25 cups 54 ounces6.75 cups 58 ounces7.25 cups

For general conversions between ounces and cups, see the ounces to cups converter.

Also convert Ounces to:

Conversion factors verified against NIST, BIPM, ISO 80000-3 1 US gallon = 3.785411784 L (exact, US customary). Last reviewed: March 2026
Adilson Fernandes By Adilson Fernandes
Tiago Fernandes Reviewed by Tiago Fernandes

All unit conversions on CoolConversion use conversion factors defined or documented by internationally recognised standards bodies (such as ISO and NIST), including both SI and non-SI units.