4.09 Ounces to Cups

4.09 fl oz = 0.51125 cup

Calculation: cup = 4.09 fl oz × 0.125 = 0.51125 cup

Ounce to Cup Converter

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How much is 4.09 fl oz?

121 mL (4.1 fl oz) is about a rocks glass (old-fashioned glass) used for cocktails.

What does 4.09 fl oz look like?

Illustration of a rocks glass
121 mL (4.1 fl oz) is about a rocks glass (old-fashioned glass) used for cocktails.

4.09 fl oz on the cup scale

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4.09 fl oz = 0.5113 cup

How to Convert Ounce to Cup

1 ounce = 18 cups

Cup = Ounce × 18

Example: 4.09 fl oz × 18 = 0.51125 cup

Reverse Conversion

To convert cups back to ounces:

  • Remember, 1 cup equals 8 ounces.
  • To convert 0.51125 cup to fl oz, multiply 0.51125 x 8, resulting in 4.09 fl oz.

4.09 fl oz is also equal to:

  • 120.96 milliliter
  • 0.12096 liter
  • 0.25563 pint
  • 0.12781 quart

Frequently Asked Questions

How much is 4.09 ounces in cups?

4.09 ounces equals 0.51125 cups. This is calculated by multiplying 4.09 by the conversion factor 0.125.

What does 4.09 ounces look like in cups?

4.09 ounces (0.51125 cups) is a small cup of liquid — half a measuring cup.

How do you calculate 4.09 ounces to cups?

Multiply 4.09 by the conversion factor 0.125. The calculation is 4.09 × 0.125 = 0.51125 cups. This factor is defined by international measurement standards.

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4.09 ounces = 0.51125 cups
4.09 ounces = 0.51125 cups — conversion chart

Nearby Conversions

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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.