🍺 Home Brew Calc

Return to Calculator · Privacy Policy

Each ingredient is stored with a sugar reference per 100g or 100ml. When you add ingredients, the calculator converts those values into total fermentable sugar for the batch, then estimates original gravity from total sugar and target volume.

1. Pick fermentables and quantities in grams or millilitres.
2. Convert each ingredient to an estimated sugar contribution.
3. Combine total fermentable sugar across the recipe.
4. Estimate OG from total sugar and batch volume.
5. Estimate FG and ABV using the selected yeast attenuation and tolerance.

If you already have measured gravity readings, the site uses the standard homebrewing shortcut formula: (OG − FG) × 131.25. This is usually the more reliable method once fermentation data from the real batch is available.

• Fruit composition changes by variety and ripeness.
• Mash efficiency varies across equipment and process.
• Fermentation can stop early if alcohol tolerance is exceeded.
• Residual sugar and dilution decisions affect the final measured gravity.