The unit for diastic conversion power is Lintner units. You need at least 35-40 / pound of grain. 2 row has 140 Lintner/ lb, so you could use 2 lbs rice for every 1 lb 2 row if you really wanted to!
9 lbs 2 row, 5 lbs rice, no problem.
Currently On Draft: Bamberger Rauch Dunkel, Belgian Blond, Pilsener Urquell clone, Smoked Porter
Bottled: Concord Pyment, Mi'Apa Sparkling Mead, Chimay Blue, Old Simcoe American Barleywine, Old Cantankerous
Fermenting and Conditioning: Pseudo-Decoction Munich Dunkel, Left Hook Bitter
Recently Kicked Kegs: Fresh Hop Pale Ale, Citra Rye IPA
On Deck: Old Rasputin, Northstar IPA, Ur-bock Dunkel