A third dimension is required to allow this calculation.
Perhaps the 13 feet deep should be 13 feet wide.
That's 13 cubic yards of mulch for every 2 inches deep.
One cubic yard of mulch will cover approximately 160 square feet at 2" deep, so you would need approximately two cubic yards of mulch to cover 271 square feet at 2" deep.
Well, gee, I think that would be 2 bags. But if you have found a bag that is 2 cubic yards, that is ONE HUGE BAG...Enough to fill the back of a pick-up truck. I think you better look into your phrasing, one cubic yard of mulch will cover 100 square feet, or an area that is 10' x 10'. IMPROVED ANSWER: I think you mean that 1 bag of mulch will cover 2 cubic feet. That's the standard bag sold at Lowes & Home Depot. 1 cubic yard = 27 cubic feet (3'x3'x3'=27). Therefore 4 cubic yards is equal to 108 cubic feet. You would need 54 bags (108/2=54).
18 cubic yards or 487.5 cubic feet.
This question needs to give what dimension the 16 x 12 is. Is it feet yards or metres.
(90-ft x 4-ft x 1/3-ft) = 120 cubic feet = 44/9 = 4.44 cubic yards (rounded)
20-ft x 40-ft x 3-in = 20-ft x 40-ft x 1/4 foot = 200 cubic feet = 7.41 cubic yards
Covert all your measurements into yards: 12 ft = 4 yds (as 1yd = 3 ft) Calculate the area of the base of the pile of mulch; assuming a square base: 4yds x 4yds = 16 sq yds Measure the height of your pile of mulch in yards. If the pile of mulch is cuboid in shape, multiply this height by the area of the base (as previously calculated). If the pile of mulch is pyramidal in shape, multiply this height by the area of the base and divide by 3.
The 'square feet' of area that it covers is 1,620/(depth of the mulch, in inches)
Based on the category I am assuming we are takling dirt or mulch. 75 yds x 27 cuft (there is 27 cuft per 1 cuyd) = 2,025 cubic feet of material - 1 foot thick would be 2,025 sqft. - 6 inches thick would be 4,050 sqft. - 3 inches thick would be 8,100 sqft.
You need to know how much area you are covering and how thick you want the mulch to be. Roughly 3 inches thick is good enough. That is 3/12 = 0.25 feet thick Take area in square feet times thickness in feet, which gives a volume in cubic feet, then divide by 27 to covert to cubic yards For example, if you want to mulch an an area that is 75 feet long and 5 feet wide, the volume is 75 x 5 x .25 = 93.75 cu ft 93.75/27 = 3.5 yards (3 and 1/2 yards)
It depends on how deep it is.