The volume of a figure with a round foundation is its height times the area of its foundation. To calculate how much gravel you need to cover a rectangular area you need to multiply the volume by the gravel density.
#Bags of gravel how to
How to calculate how much gravel you need for a foundation?ġ Square or rectangular area. How big is a 20kg bag of gravel?Ī 20 kg sack of gravel covers approx. Multiply the length by the width by the desired depth in feet for your landscape rock to find the number of cubic feet you will need. For instance, if you want the rock to be 2 inches deep, divide 2 by 12, which equals 0.1667 feet. How do I calculate how many rocks I need for landscaping?ĭivide the desired depth for your landscape rock in inches by 12 to convert it to feet.
Using 2 inches for the depth, the following measurements are a guide to the amount of gravel coverage per ton: 1/4 to 1/2 inch gravel, 100 square feet per ton 1/2 to 1 inch gravel, 90 square feet per ton and 1 1/2 to 2 inches gravel, 80 square feet per ton. How many square feet will 10 tons of gravel cover? In this case, the 4-foot-wide, 10-foot-long, 3-inch-deep strip requires 20 bags of pea gravel when each bag weighs 50 pounds.
50 Pounds of Pea Gravel Divide this by the 50 pounds that each bag weighs to determine the actual number of bags to buy.
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