YES ... I've seen both sf and sqft.
Rule of thumb might be, "If your reader understands what you've written, it's a valid abbreviation." (I know the purists are going to beat me up for that, but that's the way I see it.)
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There are 9 square feet (sf) in a square yard (sy). This is because a square yard is defined as a square with each side measuring 3 feet, and when you calculate the area (3 feet x 3 feet), you get 9 square feet.
4046.85642 square meters 43560 square feet
This is a nonsense question. Tons of dirt can be converted to cubic feet, depending on moisture and dirt type, but not to sf or square feet.
If you mean square feet, it really doesn't make sense to convert that.
1 square yard = 3 x 3 = 9 square feet 48 square yards = 48 x 9 = 432 square feet