BeverageFluid Ounces to Cups

Fluid Ounces to Cups

Methodology·How We Verify

Snapshot

1 Fluid Ounce equals 0.13 Cups.

Reference basis: This route stays inside one beverage volume system, so there is no density step in the middle.
Example: 2 Fluid Ounces work out to 0.25 Cups.

Interactive conversion

Converter Calculator

Decimals: 1.5 or 1,5. Fractions: 1/2. Scientific notation: 1e3. Write 1000 without grouping separators.

0.13 Cups

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API and AI agent access

Fluid Ounces to Cups.

Machine-readable identifiers

Conversion family: beverage
Source unit: fluid_ounce_us
Target unit: cup_us

Use these identifiers in the API request. Sources and model limits also apply to software clients.

Example API request and response

POST /api/v1/convert

Request

{
  "family": "beverage",
  "value": 1,
  "from": "fluid_ounce_us",
  "to": "cup_us"
}

Essential response

{
  "ok": true,
  "conversion": {
    "family": "beverage",
    "value": 1,
    "from": "fluid_ounce_us",
    "to": "cup_us",
    "result": {
      "raw": 0.125,
      "display": "0.13"
    },
    "canonicalPath": "/beverage/fluid-ounces-to-cups/"
  }
}

API, OpenAPI and WebMCP documentation

Explanation

Fluid ounces (fl oz) are a volume measure, not a weight ounce, so this conversion keeps the math within that same volumetric dimension.

It follows the same US customary cup and fluid-ounce standards used across the beverage converters, so the result stays aligned with the rest of the site.

Method & Reference

Method basis: exact conversion formula shown in Snapshot.
Applied factor: 1 Fluid Ounce = 0.13 Cups.
Consistency rule: calculator output and table values use the same constants and rounding policy.

Common Conversion Values

Fluid Ounces	Cups
1	0.13
2	0.25
3	0.38
4	0.5
5	0.63
8	1
12	1.5
16	2
20	2.5
32	4

Questions & answers

Frequently Asked Questions

Are fluid ounces the same as ounces (weight)?

Fluid ounces (fl oz) measure volume while ounces (oz) measure weight, so this page stays inside the volumetric dimension.

Does this assume a US cup?

Yes. It uses the US customary cup defined as 236.588 mL so the result matches the site's shared cup definition.

Why do recipes sometimes list fluid ounces instead of cups?

Fluid ounces can describe pours more precisely for bars and recipes, and this converter shows how those pours relate back to cups.