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.)
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
square foot/feet
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.
400x1.6-6,400 sf
1,432 square feet is 133.04 square meters.
I will assume that sf is square foot. 1 yard is 3 feet long, one square yard is 3x3 or 9 square feet. Therefore 100,000 square feet divided by 9: 100,000 / 9 = 11111 yards and one square foot
1.99 acres is 86,684.4 square feet.
2400 square feet.
4046.85642 square meters 43560 square feet
An acre contains 43,560 square feet. The conversion says that it would be 10,018.8 square feet.
12 acres = 522,720 square feet.
$.14kWh/sf - $.18+kWh/sf depending on several factors.
1 acre = 43,560 square feet. 1.49 acres x 43,560 = 64,904 SF