Free Homebrew Beer ABV & Gravity Calculator—
gemini-3.0-flash
gemini-3.0-flashAccurately calculate your homebrew beer's ABV and attenuation with our free online calculator. Simply enter your original and final gravity readings to get results.
What This App Does
Accurately calculate your homebrew beer's ABV and attenuation with our free online calculator. Simply enter your original and final gravity readings to get results. — generated by gemini-3.0-flash and published by @Akhenaten on Slopstore. Categorized under Utility, this app is part of Slopstore's curated collection of AI-generated tools and experiments. Run it free in your browser. No installation needed.
AI Generation Prompt
Homebrew Beer ABV & Gravity Calculator
Overview
A clean, professional, and mobile-responsive browser tool for homebrewers to calculate alcohol by volume (ABV) and apparent attenuation. This tool eliminates the need for manual calculations, providing instant results as the user enters their gravity data.
Technical Specification
- Architecture: Single-file architecture containing HTML5, Tailwind CSS, and Vanilla JavaScript.
- Storage: Completely stateless. No
localStorage, cookies, or external databases are used. All calculations occur in-memory. - Compatibility: Designed to work within strictly sandboxed iframes. No pop-ups or alerts are used; status messages and results are rendered directly in the DOM.
UI/UX Design
- Aesthetic: Modern, "SaaS" aesthetic. High-contrast, light-mode design with soft shadows and a professional typography (Inter or system sans-serif).
- Color Palette:
- Background:
#F8FAFC - Primary:
#2563EB(Blue for inputs/buttons) - Secondary:
#10B981(Green for result indicators) - Text:
#1E293B(Primary),#64748B(Secondary)
- Background:
- Layout:
- Header: Simple, clear title and short tagline.
- Main Input Area: Two primary numeric input fields (Original Gravity, Final Gravity). Use large, touch-friendly inputs.
- Calculation Logic: Real-time listeners on input fields trigger the calculation function immediately, showing results without requiring a submit button.
- Results Section: A clear card area displaying the calculated ABV percentage and Apparent Attenuation. Use a visual gauge or progress-like effect to show strength.
Key Features
- Instant Calculation: Real-time updates as user types inputs.
- Validation: Input range clamping (e.g., gravity must be between 1.000 and 1.200).
- Responsive Design: Vertically stacked inputs on mobile devices, transitioning to a side-by-side or balanced layout on tablet/desktop.
- Instructional Text: Dynamic, concise help text that appears below inputs if invalid data is detected (e.g., if FG > OG).
- No-Click Interaction: The "Calculator" feel is achieved by removing the need for an explicit "Calculate" button.
Implementation Guidelines
- Use
input type="number" step="0.001"for precision. - JavaScript must debounce updates for performance, though simple calculation math is lightweight.
- CSS must utilize
transitionproperty for smooth color and element opacity changes when results appear. - No external dependencies, excluding Tailwind CSS via CDN (Tailwind CLI/PostCSS not allowed, must be single-file compliant).
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gemini-3.0-flashFiles being used
Frequently Asked Questions
Everything you need to know about using this application.
How do you calculate beer ABV from gravity readings?
To calculate the Alcohol by Volume (ABV) of your beer, you subtract the Final Gravity (FG) from the Original Gravity (OG), then multiply the result by 131.25. This standard formula provides a reliable estimation of the alcohol content based on the sugars converted into alcohol during fermentation. Our calculator automates this math to save you time and prevent calculation errors. Simply input your hydrometer readings taken before and after fermentation to instantly view the approximate alcohol percentage of your homebrew.
Why is it important to measure Original Gravity?
Original Gravity (OG) measures the density of your unfermented wort before the yeast is pitched. This reading is critical because it tells you exactly how much fermentable sugar is available for the yeast to consume, serving as the baseline for your entire brewing project. By comparing the OG to your later readings, you can determine if you have reached your target efficiency and ensure your recipe design is performing as expected. Without an accurate OG, it is impossible to calculate your beer's final ABV.
What is Final Gravity and when should I measure it?
Final Gravity (FG) is the specific gravity reading of the beer once fermentation has completely finished. Measuring the FG confirms that your yeast has done its job and that the fermentation process is stable, which is necessary before bottling or kegging to prevent issues like bottle bombs. Ideally, you should take an FG reading when the gravity has remained consistent over several days. Comparing the FG against your OG allows you to calculate the apparent attenuation, which is a measure of how efficiently the yeast consumed the sugars in the wort.
What is Apparent Attenuation in brewing?
Apparent Attenuation represents the percentage of sugars that have been converted into alcohol and carbon dioxide by the yeast. It is calculated by comparing the drop in gravity to the original gravity, providing insight into the health and performance of your yeast strain. A typical range for attenuation is between 65% and 80%, depending on the yeast strain and the mash temperature. If your attenuation is too low, it may indicate a stalled fermentation or an issue with the mash process, helping you diagnose and improve your future brewing batches.
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