I have a robobrew and i'm trying to figure out how much water i need to boil for my mash, and the temperature etc. I've been looking at this tool:

https://www.brewersfriend.com/mash/ but i'm not sure what all the terms mean.

What is first rest temperature?

This is the recipe that I am using:

https://www.ontariobeerkegs.com/v/vspfiles/assets/images/grainkit - obk chocolate milk stout.pdf
My friend, who also has a robobrew told me that I should plug in 0.35 for the mash water/grain ratio based on his experience.

So i guess my question is, is the first rest temperature the temp of the water when i start adding the grains? The recipe says I need to mash at 150F/65C. Is that the value? Sorry for being such a noob.

Also, is this the right approach for calculating the right amount of strike water? I assume that my grains will absorb 1.5 gallon of water; 1 gallon will evaporate.

This is the calc I have:

+ 4.5 g (for mash, per the calculator)

- 1.5 g absorbed by grains (how do you calc this?)

-----------------------

=3 g left in mash tun by the time sparging starts.

If desired finished product is 5.25 gallons, i need to:

add 2.25 g of sparge water to bring it up to 5.25 g. And then tack on another 1g for evaporation during the boil.

So .. total water is 4.5 g mash + 3.25 g = 7.75 G

Does that sound right?

Thanks.

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