Curious about the math in brandons answer here. It's actually .027 bushels per sq ft. which adds up to 1.215 lbs per sq ft at 45 lbs of barley to a bushel.

an acre is 208 ft sq. if we calculate for the least successful amount of 5 bushels per acre. at the expected weight of 45 lbs of barley per bushel

(5/208)*45 = 1.0817 lbs of barley per sq ft.

this fellow claims he got one 330ml finished beer per sq ft at the gravity he was targeting. https://brewingbeerthehardway.wordpress.com/2015/08/02/one-beer-per-square-foot/

but generally it takes 2 lbs of grain per gallon of wort. so in theory you should be able to get 5 gallons with 10 sqft of planting area. I have that much room in the sun facing windows of my NYC apartment!

another stab at the math. thanks @TMN

an acre is 43264 ft sq. if we calculate for the least successful amount of 5 bushels per acre. at the expected weight of 45 lbs of barley per bushel

(5/43264)*45 = 0.0052 lbs of barley per sq ft.

this seems really on the low side.

this fellow claims he got one 330ml finished beer per sq ft at the gravity he was targeting. https://brewingbeerthehardway.wordpress.com/2015/08/02/one-beer-per-square-foot/

his yield was 32 lbs in 226 sq ft.He made 4 5 gal batches at 8 lbs of grain batch. that 0.142 lbs per sq ft. 2 orders of magnitude more than the other number.