I came up with 12 for me, but I highly doubt it’s very accurate, plus my air travel is questionable right now. I do well on some energy savings tips, but it doesn’t distinguish between a 1500 sq ft home and a 3000 sq ft home. There would definitely be a difference.
I agree there’s a big difference in the size of the house. There’s also the human size to take into account. My 1 year-old isn’t consuming nearly as much as I am but we’re counted jointly. At least it gets us thinking about our consumption.