4.21 Ounces to Cups

4.21 fl oz = 0.52625 cup

Calculation: cup = 4.21 fl oz × 0.125 = 0.52625 cup

Ounce to Cup Converter

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How much is 4.21 fl oz?

125 mL (4.2 fl oz) is about a rocks glass (old-fashioned glass) used for cocktails.

What does 4.21 fl oz look like?

Illustration of a rocks glass
125 mL (4.2 fl oz) is about a rocks glass (old-fashioned glass) used for cocktails.

4.21 fl oz on the cup scale

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4.21 fl oz = 0.5263 cup

How to Convert Ounce to Cup

1 ounce = 18 cups

Cup = Ounce × 18

Example: 4.21 fl oz × 18 = 0.52625 cup

Reverse Conversion

To convert cups back to ounces:

  • Remember, 1 cup equals 8 ounces.
  • To convert 0.52625 cup to fl oz, multiply 0.52625 x 8, resulting in 4.21 fl oz.

4.21 fl oz is also equal to:

  • 124.5 milliliter
  • 0.1245 liter
  • 0.26313 pint
  • 0.13156 quart

Frequently Asked Questions

How much is 4.21 ounces in cups?

4.21 ounces equals 0.52625 cups. This is calculated by multiplying 4.21 by the conversion factor 0.125.

What does 4.21 ounces look like in cups?

4.21 ounces (0.52625 cups) is a small cup of liquid — half a measuring cup.

How do you calculate 4.21 ounces to cups?

Multiply 4.21 by the conversion factor 0.125. The calculation is 4.21 × 0.125 = 0.52625 cups. This factor is defined by international measurement standards.

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4.21 ounces = 0.52625 cups
4.21 ounces = 0.52625 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.