I think it's about 0.03% of all US farmland, 3 orders of magnitude more.

267K acres out of 897M acres.

No, there are only 330M acres of US farmland according to the USDA:

source in blog post sorry

https://thinkingagriculture.io/incentivizing-regenerative-ag...

Page 4 in this USDA Ag Stats report says it's 897M acres: https://www.nass.usda.gov/Publications/Todays_Reports/report...

"Total land in farms, at 897,400,000 acres, decreased 2,100,000 acres from 2018."

I've seen the 330M acres figure elsewhere as the "prime" farmland area rather than total farmland and the blog post you cite has figures that include fallow, idle, and pasture farmland categories above the crop usage figure of 330M acres.

In any case, cropland is 2.5 orders of magnitude higher than GP's calculation rather than a full 3.

Thanks!