BeverageFluid Ounces to Grams

Rum (40% ABV) Fluid Ounces to Grams

Updated: July 28, 2026 · Source: 40% ABV ethanol-water density approximation (Rum density near 40% ABV.)

Snapshot

1 fluid ounce of rum (40% abv) equals 28.21 grams. Conversion Encyclopedia keeps one fixed beverage basis on this page so the calculator, common values, and reverse page stay aligned.

Reference basis: 0.954 g/mL.
Example: 2 fl oz = 56.43 g.
This uses Rum (40% ABV) at 40% ABV (not pure ethanol), so density differs from alcohol-only references.

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

Interactive conversion

Converter Calculator

28.21 Grams

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28.21 grams

With 1 fluid ounce of Rum (40% ABV), that equals 28.21 grams.

Machine access

Available to apps and AI agents

Rum (40% ABV) Fluid Ounces to Grams can be requested through Conversion Encyclopedia's structured interfaces by software and compatible AI agents. The rum-40 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: rum-40

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": "rum-40"
}

Essential response

{
  "ok": true,
  "conversion": {
    "family": "beverage",
    "value": 1,
    "from": "fluid_ounce_us",
    "to": "gram",
    "result": {
      "raw": 28.213147202625,
      "display": "28.21"
    },
    "canonicalPath": "/beverage/fluid-ounces-to-grams/rum-40/"
  }
}

Full API documentation

Explanation

Convert US fluid ounces of rum (40% abv) to grams using a density reference of 0.954 g/mL. On that basis, 1 US fluid ounce works out to 28.21 grams for this ingredient.

That is especially useful for cocktail specs, bottle-fill checks, and bar batching where rum (40% abv) starts as a measured pour but the target is weight. Rum (40% ABV) is treated here as 40% ABV, so stronger or lower-proof bottles can shift the practical density slightly.

Method & Density Basis

Density basis: 0.954 g/mL (anchored to US cup 236.588 mL and US fl oz 29.57 mL).
Applied factor: 1 Fluid Ounce = 28.21 Grams.
Consistency rule: mirror pages invert the same per-liquid constants so forward and reverse directions remain aligned.
Source: 40% ABV ethanol-water density approximation (Rum density near 40% ABV.)

Common Conversion Values

Fluid Ounces	Grams
0.5	14.11
1	28.21
2	56.43
4	112.85
8	225.71
12	338.56
16	451.41

Methodology

Rum (40% ABV) density evidence

Rum (40% ABV) uses 0.954 g/mL in this dataset, which is 4.6% lighter by volume than the 1 g/mL water reference. Evidence status: medium-confidence. Source basis: Rum density near 40% ABV.

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 Rum (40% ABV)?

1 fluid ounce of Rum (40% ABV) is 28.21 grams using the density reference for this converter.

What fluid-ounce standard is applied for Rum (40% ABV)?

It uses the US fluid ounce (29.5735 mL) with a density of 0.954 g/mL.

How many grams are in 2 fl oz of Rum (40% ABV)?

2 fluid ounces of Rum (40% ABV) are 56.43 grams using the density reference for this converter.

How do I convert Rum (40% ABV) grams back to fluid ounces?

Use the mirror Grams To Fluid Ounces page; for this ingredient, 1 g = 0.04 fl oz.