[BrooklynBeer]

How large of a mash tun for 30 pounds grain?  What size for 50 pounds ?

[BrewBama]

Vaevictus says—

After enjoying the 5/10/13/15.5 gallon gif that was in the thread:
...

I decided to build a more flexible spreadsheet for the same results:
https://docs.google.com/spreadsheet/ccc?key=0AmGsOePpypKmdFRVR1J5YzBQUXM3Nk5ncE96eUtxQVE#gid=0

Other than being based on imperial measurements, it's very flexible and customizable, but by default offers 1 to 44.5 gallon tuns in half gallon increments.  You can change the mash thickness, absorption, target batch sizes to compare as well as efficiencies to compare.

Any suggestions?

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[narvin]

https://www.rackers.org/calcs.shtml

[denny]

You also need to think in terms of the volume the star will take up.  Data point...I have a 152 qt. cooler. I use for big beers.  I can get 65 lb. of grain in it at 1.5 qt./lb. with room to spare.

[goose]

Another data point.  I have a 15.5 gallon keggle that I can fit about 33# of grain into.  I did put 35# in it for an 11 gallon batch (1.3 quarts/lb.) of imperial stout but it was full to the brim and I won't attempt that much again.  When I make this the next time, I will double batch to be safe and avoid a royal mess in my brewery.