How Much Water to Add to Mash?

[TastySalmon]

I'll be doing my next mash in a cooler. I normally do it on the stove, but doing more than 10 pounds turns into a hassle. I'll be mashing 12 pounds of grain at 1.5 qts/pound. What temperature water do you add to get 151 degrees? Is there some formula on the interwebs people use?

 

[Mountainbeers]

This calculator: http://www.rackers.org/calcs.shtml

Gives you 166 F.

 

[TastySalmon]

Thanks! Just what I was looking for.

 

[ajf]

Don't forget to pre-heat the cooler up to the approximate temperature first.
-a.