The blaze, one of a dozen across the state, has consumed more than 35,000 acres in San Luis Obispo county The blaze, one of a dozen across the state, has consumed more than 35,000 acres in San Luis Obispo county Acres burned US wildfires are measured in terms of acres. While the size of a wildfire doesn’t necessarily correlate to its destructive impact , acreage provides a way to understand a fire’s footprint and how quickly it has grown. There are 2.47 acres in a hectare, and 640 acres in a