That depends on how many cubic feet of sand fit in that 50 pound bag.
I can get you close, but cannot give the final answer.
First convert your dimensions of the sandbox to feet.
86 inches = 86 / 12 = 7.166 feet
45 inches = 45 / 12 = 3.75 feet
6 inches = 6 / 12 = 0.50 feet
Multiply the 3 together to determine the total cubic footage required...
7.166 * 3.75 * 0.5 = 13.437375 cubic feet.
Once you know how many cubic feet are in your sandbag --- call it X, you determine your needed number of bags by dividing 13.437375 by X.
Hope this helps.
(60" x 100" x 6") = 36,000 cubic inches
4.4 bags for each 1-foot deep. 2.2 bags for each 6-inches deep. Each 5-ft3 bag will cover the area to 2.72 inches deep.
Assuming the box was empty to begin with there will be 8 inches of sand now.
8*5*1/2 = 20 cubic feet.
3 inches = 1/4 footVolume = 82 x 1/4 = 20.5 cubic feetIf you're buying 5-cubic-foot bags, then these are your choices:-- Buy 4 bags, and leave the job 2.5% incomplete. (Cover is only 2.93" deep, not 3".)-- Buy 5 bags, and use only 10% of the 5th one.-- Spread all 5 bags, and wind up with the 82 square feet covered 3.66 inches deep.
ABOUT 43 bags. Dry sand weighs ABOUT 100 lbs per cubic foot- and you need 21.3 cubic feet.
You would need 31, 80 pound bags to cover 1 cubic yard at 4 inches deep. If you would like the depth to be 6 inches, 45 bags would be needed.
(60" x 100" x 6") = 36,000 cubic inches
4.4 bags for each 1-foot deep. 2.2 bags for each 6-inches deep. Each 5-ft3 bag will cover the area to 2.72 inches deep.
The volume of sand weighs 455x 2/12 *100 pounds per cubic foot = 7600 pounds so you need about 152 bags.
16 bags for every 3 inches deep
12.3 bags for every 2 inches deep. (rounded)
how deep?
Assuming the box was empty to begin with there will be 8 inches of sand now.
8*5*1/2 = 20 cubic feet.
3 inches = 1/4 footVolume = 82 x 1/4 = 20.5 cubic feetIf you're buying 5-cubic-foot bags, then these are your choices:-- Buy 4 bags, and leave the job 2.5% incomplete. (Cover is only 2.93" deep, not 3".)-- Buy 5 bags, and use only 10% of the 5th one.-- Spread all 5 bags, and wind up with the 82 square feet covered 3.66 inches deep.
8 ft * 10 ft * 0.5 ft = 40 cubic feet