Calculate #3 Limestone Coverage (Square feet) 400 sq ft Volume (Cubic feet) 67 cu ft Volume (Cubic yards) 2.5 cu yd Estimated amount (Pounds) 5,951 lb Estimated amount (Tons) 2.98 ton Click to see full answer. Similarly one may ask, how many yards are in a ton?Since there are 2000 pounds in a ton this is 2700.2000 = 1.35 tons per cubic yard and thus 15 cubic yards weighs 1.35 × 15 = 20.25 tons.Also, how do you calculate tons of limestone? Length in feet x Width in feet x Depth in feet (inches divided by 12). Take the total and divide by 21.6 (the amount of cubic feet in a ton). The final figure will be the estimated amount of tons required. In this manner, how many yards are in a ton of rock? A general rule of thumb when converting cubic yards of gravel to tons is to multiply the cubic area by 1.4. For your reference, gravel typically weighs 2,800 pounds per cubic yard. In addition, there are 2,000 pounds to a ton. For instance, if your area to be landscaped is 100 cubic yards, multiply that by 1.4.How much does a yard of limestone rock weigh?One cubic yard of broken limestone weighs about 1.3 tons. One cubic yard of pulverized limestone weighs about 1.17 tons.