Badass Proof Calc

OIML Proof & Dilution Calc

Only for iPhone

Free · Designed for iPhone. Not verified for macOS.

iPhone

Hit your target proof on the first try. OIML-accurate dilution math, Julian-dated batch history, and zero fluff — built for distillers, not spreadsheets. Badass Proof Calc is a no-nonsense proof and dilution calculator built for craft distillers, whiskey makers, and serious home distillers. Plug in your starting proof, target proof, and volume — get the exact amount of water to add. Math is powered by the official OIML alcoholometric tables, so your numbers match what the TTB and the rest of the industry use. FEATURES • OIML-accurate dilution calculator • Density-to-proof conversion using official OIML tables • Final volume + weight output for both 100-proof and 90-proof references • Batch history with Julian date numbering for clean record-keeping • All data stored locally — no account, no cloud, no nonsense • Works fully offline in the still-house • Dark, on-brand UI built to live next to a hydrometer, not a laptop Built by distillers, for distillers. Cut your proof right the first time.

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The developer, RONALD JAMES STONE, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

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    Accessibility

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    Information

    Seller
    • RONALD JAMES STONE
    Size
    • 38.9 MB
    Category
    • Utilities
    Compatibility
    Requires iOS 15.1 or later.
    • iPhone
      Requires iOS 15.1 or later.
    • iPod touch
      Requires iOS 15.1 or later.
    • Mac
      Requires macOS 12.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 1.0 or later.
    Languages
    • English
    Age Rating
    13+
    • 13+
    • Learn More
    • Infrequent
      Alcohol, Tobacco, Drug Use or References
    Copyright
    • © 2026 Garage Oil Spirits
  • Privacy Policy

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