Boiling less liquid

[dwhyte]

My setup may require me to boil the extract and hops in a smaller amount that normal, maybe under 10 litres. Then top up with cold water in the FV.
For a standard 1040 brew, how do I work out the hop weight to use for the higher gravity of the reduced boil?

Cheers.

[boingy]

There are detailed equations and tables here:

www.howtobrew.com/section1/chapter5-5.html

but tbh your best bet is to get yourself some decent brewing software and plug in the numbers.

[dwhyte]

Cheers Boingy.

Will look at the software angle.