AI Unit Converters
v1.0

Cup (US Customary) to Fluid Ounce (US) Converter

1 Cup (US Customary) is equal to 8Fluid Ounce (US)s (fl oz). To convert cup (us customary)s to fluid ounce (us)s, multiply the value by 8 or use the interactive formula breakdown and reference tables below.

⇄

Volume Converter

Formula: --
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Step-by-Step Mathematical Derivation

Verified SI Standard
➡️ Convert Cup (US Customary) to Fluid Ounce (US)
Value in fl oz = Value in cup × 8

To convert any quantity from Cup (US Customary) to Fluid Ounce (US), multiply the quantity by the constant conversion factor 8.

⬅️ Convert Fluid Ounce (US) to Cup (US Customary) (Inverse)
Value in cup = Value in fl oz × 0.125

To reverse the operation, multiply your Fluid Ounce (US) figure by 0.125 (or divide by 8).

🔢 Step-by-Step Calculation Procedure:
  1. Identify the starting value in Cup (US Customary) (cup).
  2. Apply the exact linear conversion factor: 1 cup = 8 fl oz.
  3. Multiply the input value by 8 to obtain the exact measurement in Fluid Ounce (US) (fl oz).
  4. Verify precision against standard BIPM / NIST SP 811 statutory guidelines.
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All-Units Instant Matrix

Live Computed
Liter --
L
Milliliter --
mL
Cubic Meter --
m³
Gallon (US) --
gal
Gallon (Imperial) --
imp gal
Quart (US) --
qt
Pint (US) --
pt
Cup (US Customary) --
cup
Fluid Ounce (US) --
fl oz
Tablespoon (US) --
tbsp
Teaspoon (US) --
tsp
Cubic Foot --
ft³
Cubic Inch --
in³
🖨️

Printable Reference Cheat Sheet

Generate clean offline reference PDF tables for Volume & Liquid

📦 Embed this Converter Widget on Your Website Free Web Component

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🎓

Academic & Research Citation Exporter

Cite this mathematical formula and conversion factor in research papers and wikis

BibTeX / APA / IEEE 
@misc{ai_unit_converter_cup_(us_customary)_to_fluid_ounce_(us),
  author       = {AI Unit Converters Standards Board},
  title        = {Exact Cup (US Customary) to Fluid Ounce (US) Conversion Factor and Mathematical Derivation},
  year         = {2026},
  howpublished = {\url{https://aiunitconverters.com/volume/cup_us-to-fl_oz_us}},
  note         = {Derived from NIST Special Publication 811 and BIPM SI Brochure}
}

📊Cup (US Customary) to Fluid Ounce (US) Conversion Tables

Cup (US Customary)s (cup)Fluid Ounce (US)s (fl oz)
1cup8fl oz
2cup16fl oz
5cup40fl oz
10cup80fl oz
15cup120fl oz
20cup160fl oz
25cup200fl oz
50cup400fl oz
75cup600fl oz
100cup800fl oz
250cup2,000fl oz
500cup4,000fl oz
1000cup8,000fl oz
5000cup40,000fl oz
10000cup80,000fl oz
Fluid Ounce (US)s (fl oz)Cup (US Customary)s (cup)
1fl oz0.125cup
2fl oz0.25cup
5fl oz0.625cup
10fl oz1.25cup
15fl oz1.875cup
20fl oz2.5cup
25fl oz3.125cup
50fl oz6.25cup
75fl oz9.375cup
100fl oz12.5cup
250fl oz31.25cup
500fl oz62.5cup
1000fl oz125cup
5000fl oz625cup
10000fl oz1,250cup
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❓ Frequently Asked Questions: Cup (US Customary) to Fluid Ounce (US)

How do you convert Cup (US Customary)s to Fluid Ounce (US)s?▼

1 Cup (US Customary) is equal to 8 Fluid Ounce (US)s. Multiply your input value in Cup (US Customary)s by 8 to obtain the exact equivalent in Fluid Ounce (US)s.

How many Fluid Ounce (US)s are in 1 Cup (US Customary)?▼

There are exactly 8Fluid Ounce (US)s (fl oz) in 1 Cup (US Customary) (cup).

Are these calculations calibrated against official measurement standards?▼

Yes. All conversion factors on AI Unit Converters are calibrated and cross-verified against official BIPM SI Brochure (9th Edition), NIST SP 811, and ISO 80000 measurement metrology standards.

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