Adjusting recipes

[bluebuzzard]

I'm using the Brew Classic European Beers at home book to help with getting ideas for recipes but as I'm going to be dropping down to 19 litre batches how would I alter the 23 litre ingredients to take into account the smaller volume?

[roger the dog]

Divide the the recipe weights by 23 then multiply by 19

[bluebuzzard]

I like the cut of yer jib sir!