"12 inches X 12 inches If you have a friend with a size 12 foot or 2 would be more handy have him put his left foot facing towards you and his right foot facing to the right. Heel to Heel this will give you a rough visual. Or you could do the same with 2 tape measures using the twelve inch marks. This will give you one side of the square foot just visualize the other side."@en . "12 inches X 12 inches If you have a friend with a size 12 foot or 2 would be more handy have him put his left foot facing towards you and his right foot facing to the right. Heel to Heel this will give you a rough visual. Or you could do the same with 2 tape measures using the twelve inch marks. This will give you one side of the square foot just visualize the other side."@en . . . "How big is a square foot"@en . .