Converting recipes in "Brewing Classic Styles"

[JETDOG07]

Can anyone help me understand how to convert the extract recipes in this book from their 7 gallon boil volume down to a 4 gallon boil volume?

 

[eric19312]

How much wort are you planning to ferment? If you are planning to top up to 5-5.5 gallons in the fermentor I'd expect you don't really need to change the recipe at all. hop isomerization will be a little different due to the more concentrated boil but should work out. You might fix this by adding half the extract at beginning of boil and other half at end of the boil.

 

[JETDOG07]

How much wort are you planning to ferment? If you are planning to top up to 5-5.5 gallons in the fermentor I'd expect you don't really need to change the recipe at all. hop isomerization will be a little different due to the more concentrated boil but should work out. You might fix this by adding half the extract at beginning of boil and other half at end of the boil.

I will be fermenting 5 gallons of wort.

 

[jerbrew]

Add enough extract to get to the pre-boil gravity stated in the book at the beginning of the boil. you can use brewers friend or something to help you with that. add the remaining extract at the end of the boil.