{
  "slug": "abv-calculator",
  "title": "ABV Calculator",
  "heading": "ABV Calculator",
  "category": "other",
  "url": "https://www.revenuelab.fyi/toolbox/abv-calculator",
  "summary": "Alcohol by volume from original and final gravity.",
  "description": "Standard and alternate ABV formulas from hydrometer readings, plus apparent attenuation and calories per 12 oz.",
  "formula": "ABV ≈ (OG − FG) × 131.25.",
  "dateModified": "2026-09-30",
  "run_url": "https://www.revenuelab.fyi/api/public/calc?tool=abv-calculator",
  "inputs": [
    {
      "id": "og",
      "label": "Original gravity",
      "kind": "number",
      "hint": null,
      "default": 1.056,
      "unit": null,
      "min": null,
      "max": null
    },
    {
      "id": "fg",
      "label": "Final gravity",
      "kind": "number",
      "hint": null,
      "default": 1.012,
      "unit": null,
      "min": null,
      "max": null
    }
  ],
  "outputs": [
    {
      "id": "abv",
      "label": "ABV (standard)",
      "format": "percent",
      "hint": null,
      "primary": true
    },
    {
      "id": "alt",
      "label": "ABV (alternate formula)",
      "format": "percent",
      "hint": null,
      "primary": false
    },
    {
      "id": "att",
      "label": "Apparent attenuation",
      "format": "percent",
      "hint": null,
      "primary": false
    },
    {
      "id": "cal",
      "label": "Calories per 12 oz (approx)",
      "format": "number",
      "hint": null,
      "primary": false
    }
  ],
  "worked_example": {
    "inputs": [
      "Original gravity: 1.056",
      "Final gravity: 1.012"
    ],
    "outputs": [
      "ABV (standard): 5.78%",
      "ABV (alternate formula): 5.93%",
      "Apparent attenuation: 78.6%",
      "Calories per 12 oz (approx): 662.99"
    ]
  },
  "how_to": {
    "title": "How to use this",
    "steps": [
      "Enter original gravity.",
      "Enter final gravity.",
      "Read your abv (standard) on the right — it updates as you type.",
      "Hit Share to keep the scenario or send it to someone."
    ]
  },
  "scenarios": [
    {
      "name": "Conservative",
      "description": "Lower-end numbers — what if things land soft?",
      "values": {
        "og": 0.6336,
        "fg": 0.6072
      }
    },
    {
      "name": "Typical",
      "description": "Defaults — the most common real-world setup.",
      "values": {
        "og": 1.056,
        "fg": 1.012
      }
    },
    {
      "name": "Ambitious",
      "description": "Higher-end numbers — what if things really pop?",
      "values": {
        "og": 1.6896000000000002,
        "fg": 1.6192000000000002
      }
    }
  ],
  "limitations": [
    "Estimates assume standard, average conditions — local rules, pricing, and materials vary.",
    "Results are rounded for readability; add a buffer before ordering, booking, or committing.",
    "Double-check anything with a real cost attached against a local quote."
  ],
  "faq": [
    {
      "q": "How does the abv calculator work?",
      "a": "Standard and alternate ABV formulas from hydrometer readings, plus apparent attenuation and calories per 12 oz. The underlying maths is: ABV ≈ (OG − FG) × 131.25."
    },
    {
      "q": "What do I need to enter?",
      "a": "2 values: original gravity, and final gravity. Each field starts with a sensible default, so you can change one number at a time and watch the result move."
    },
    {
      "q": "What does the abv (standard) result mean?",
      "a": "It is returned as a percentage and updates live as you edit the inputs, so you can compare two or three versions of a scenario in a few seconds."
    },
    {
      "q": "Is this calculator free, and do I need an account?",
      "a": "Yes, it's free, and no account is required. Nothing you type is stored on our servers — the maths runs entirely in your browser."
    },
    {
      "q": "How accurate is the result?",
      "a": "It applies the standard formula exactly, so the arithmetic is precise. Estimates assume standard, average conditions — local rules, pricing, and materials vary."
    },
    {
      "q": "Who is this tool for?",
      "a": "It's built for anyone doing everyday planning maths — a quick estimate that would otherwise need four browser tabs and a calculator app."
    }
  ],
  "related": [
    "https://www.revenuelab.fyi/toolbox/homebrew-batch-cost"
  ],
  "license": "CC-BY-4.0",
  "citation": "RevenueLab — ABV Calculator (https://www.revenuelab.fyi/toolbox/abv-calculator)"
}