BeverageCups to Grams

Guinness Cups to Grams

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

Snapshot

1 cup of guinness equals 238.95 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 cups = 477.91 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

238.95 Grams

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238.95 grams

With 1 cup of Guinness, that equals 238.95 grams.

Machine access

Available to apps and AI agents

Guinness Cups 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: cup_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": "cup_us",
  "to": "gram",
  "material": "guinness"
}

Essential response

{
  "ok": true,
  "conversion": {
    "family": "beverage",
    "value": 1,
    "from": "cup_us",
    "to": "gram",
    "result": {
      "raw": 238.95388,
      "display": "238.95"
    },
    "canonicalPath": "/beverage/cups-to-grams/guinness/"
  }
}

Full API documentation

Explanation

Convert US cups of guinness to grams using a density reference of 1.01 g/mL. With the US cup fixed at 236.588 mL, that gives 238.95 grams per cup 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 Cup = 238.95 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

Cups	Grams
1/4	59.74
1/3	79.64
1/2	119.48
3/4	179.22
1	238.95
1 1/2	358.43
2	477.91
3	716.86
4	955.82

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 cup of Guinness?

1 US cup of Guinness is 238.95 grams using the density reference for this converter.

What density basis does this cup conversion use for Guinness?

It uses a density of 1.01 g/mL with the US cup standard (236.588 mL).

How many grams are in 2 cups of Guinness?

2 US cups of Guinness are 477.91 grams using the density reference for this converter.

How do I convert Guinness grams back to cups?

Use the mirror Grams To Cups page; for this ingredient, 1 g = < 0.01 cups.