How much to prepare for dehydrating?

Check out the cup capacity of your dehydrator's trays using dry beans or whatever in a single layer per tray with a little space between the beans. Then look up yields for raw foods after prep:
http://ift.tt/2BCS7sd
And the weight per cup of prepared food:
http://ift.tt/1T0ZWZM
and/or
http://ift.tt/f1ray2

Multiply grams per cup by number of cups to fill the dehydrator or however many of its trays you want to fill with something. Then take the weight in grams or kilograms of the number of cups you need to fill it, divide by the decimal percent yield after prepping (for 85%, divide by .85), and that is the weight of raw food you chop/slice/dice/blanch to put in for one batch.
If you need to convert kilograms into pounds, divide by 2.2, or divide grams by 28.35 to get ounces.

As noted by Bogdan, this will be a rough approximation depending on how thick/thin you slice or how finely you dice, but it will get you enough in the ballpark that everything should fit if you don't overload the trays with beans when originally checking their capacity.

FWIW, dehydrated volume averages 1/2 of fresh volume, although that, too, varies some depending on what you are dehydrating.

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How much to prepare for dehydrating?