Converting feet to acres is meaningless since feet are a measure of distance and acres are a measure of area.
If you change the question to 31684 SQUARE feet, it becomes a measure of area and can be converted to acres. We have 1 acre = 43560 sq ft, so
31684 sq ft = (31684/43560) acres = 0.72736 acres.
12,981 (square feet) = 0.298 acres.
About 15.5 acres.
27 acres = 1,176,000 square feet.
The area of 0.49 acres are 21344.4 square feet.
46 acres = 2,003,760 square feet.
1.18 acres = 51,400.8 sq feet.
3.09917 acres.
20.89 acres.
How many acres are 310 feet * 630 feet
108,000 square feet or 2.479 acres.
About 0.17 acres.
5.36 acres.
0.505 acres.
18.59 acres
2.75 acres.
2.083 acres.
5.51 acres.