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A drawback of using malt extract is that the composition of the malts is fixed by the manufacturer, which limits the control that a brewer has over their recipes. A common way to customize malt extract is to steep specialty grains like crystal malts. Another possibility is to mix different kinds of extracts to get the desired composition of malts.
The present calculator enables homebrewers to easily mix different extracts to achieve a customized mixture. This will work particularly well if your homebrew supply store will let you measure and purchase varying amounts of different malt extracts.
The calculations are based upon Briess malt extracts that have a known composition. An exception is the malt types and percentages for Sparkling Amber are not available to the public. The values used for Sparkling Amber are an estimate of 82% base, 7% crystal 60L, 10% munich, and 1% carapils.
This calculator should work fine for either liquid or dried malt extract, as long as the values are consistently one type. The percentages will be slightly off if liquid and dried extracts are mixed becuase these forms differ in their water content. For weights, the calculator assumes that the weights are all pounds or all kilograms.
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This work is licensed under a Creative Commons Attribution 4.0 International License that allows sharing, adapting, and remixing.