BeverageFluid Ounces to Grams

Guinness Fluid Ounces to Grams

Updated: July 28, 2026 · Source: Beer density approximation (Beer density approximation near room temperature.)

Snapshot

1 fluid ounce of guinness equals 29.87 grams. Conversion Encyclopedia keeps one fixed beverage basis on this page so the calculator, common values, and reverse page stay aligned.

Reference basis: 1.01 g/mL.
Example: 2 fl oz = 59.74 g.
Source basis: Beer density approximation.

Use the interactive calculator below for custom values and the common-value table for quick checks.

Interactive conversion

Converter Calculator

29.87 Grams

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29.87 grams

With 1 fluid ounce of Guinness, that equals 29.87 grams.

Machine access

Available to apps and AI agents

Guinness Fluid Ounces to Grams can be requested through Conversion Encyclopedia's structured interfaces by software and compatible AI agents. The guinness identifier tells the conversion engine which ingredient record to use for the same calculation shown by the calculator.

Machine-readable identifiers

Conversion family: beverage
Source unit: fluid_ounce_us
Target unit: gram
Ingredient: guinness

The JSON API and OpenAPI specification use the identifiers to reach the conversion engine. WebMCP lets compatible AI agents request the same calculation.

Example API request and response

POST /api/v1/convert

Request

{
  "family": "beverage",
  "value": 1,
  "from": "fluid_ounce_us",
  "to": "gram",
  "material": "guinness"
}

Essential response

{
  "ok": true,
  "conversion": {
    "family": "beverage",
    "value": 1,
    "from": "fluid_ounce_us",
    "to": "gram",
    "result": {
      "raw": 29.869264858125,
      "display": "29.87"
    },
    "canonicalPath": "/beverage/fluid-ounces-to-grams/guinness/"
  }
}

Full API documentation

Explanation

Convert US fluid ounces of guinness to grams using a density reference of 1.01 g/mL. On that basis, 1 US fluid ounce works out to 29.87 grams for this ingredient.

That keeps guinness tied to one density reference instead of switching between generic liquid charts. Guinness can vary a little with formulation and temperature, so the converter keeps one density reference for consistency.

Method & Density Basis

Density basis: 1.01 g/mL (anchored to US cup 236.588 mL and US fl oz 29.57 mL).
Applied factor: 1 Fluid Ounce = 29.87 Grams.
Consistency rule: mirror pages invert the same per-liquid constants so forward and reverse directions remain aligned.
Source: Beer density approximation (Beer density approximation near room temperature.)

Common Conversion Values

Fluid Ounces	Grams
0.5	14.93
1	29.87
2	59.74
4	119.48
8	238.95
12	358.43
16	477.91

Methodology

Guinness density evidence

Guinness uses 1.01 g/mL in this dataset, which is 1.0% heavier by volume than the 1 g/mL water reference. Evidence status: medium-confidence. Source basis: Beer density approximation near room temperature.

Brand formulation, alcohol or sugar concentration, carbonation, and serving temperature can change the weight of a measured volume. Use this value as a documented reference rather than a producer specification.

Questions & answers

Frequently Asked Questions

How many grams are in 1 fluid ounce of Guinness?

1 fluid ounce of Guinness is 29.87 grams using the density reference for this converter.

What fluid-ounce standard is applied for Guinness?

It uses the US fluid ounce (29.5735 mL) with a density of 1.01 g/mL.

How many grams are in 2 fl oz of Guinness?

2 fluid ounces of Guinness are 59.74 grams using the density reference for this converter.

How do I convert Guinness grams back to fluid ounces?

Use the mirror Grams To Fluid Ounces page; for this ingredient, 1 g = 0.03 fl oz.