Parti-Gyle Calculations

[Beer_Pirate]

Does anyone here have a formula or know of a calculator that will help with recipe design for a parti-gyle brew? I'm thinking of doing an all maris otter IPA, then tossing in a small percentage of roasted/crystal malts to collect a second runnings for an English Mild. I'm not opposed to blending the two runnings, and could always steep the darker malts after blending. I'm just stuck on where to start on the math side of this.

 

[J A]

The BF calculators don't seem to include one. Here's a simple calculator that I've used before:
http://www.astrocaver.com/java/Parti-Gyle.html
That should get you started.

 

[thunderwagn]

Not sure if this helps much, but Priceless is one of the few calculators I've seen that actually gives you 1st and 2nd running numbers. I've always found it to be very accurate. https://pricelessbrewing.github.io/BiabCalc/#Advanced