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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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
2.66 Square Feet 1 square foot = 144 Square inches (12" X 12"). To determine square feet (SF), from suare inches (SI), divide the SI by 144. 16" X 24" equals 384 SI 384 / 144 equals 2.666667 SF FORMULA: (W X L) / 144 = SF (where W = Width in inches and L = lenght in inches) Also helpful, to determine Square yards (for carpet, etc.) Divide the Square feet by 9 EXAMPLE 3 feet by 3 feet = 9 SF. 9/9 = 1 Square Yard 10 X 12 room = 120 SF 120/9 = 13.33 SY