Determining how large an area a given weight of gravel fills in requires using the builder's average for gravel. Starting with the formula density equals weight divided by volume, you can find the volume the gravel will fill with only the weight and density. Since various gravel products have different densities, ask your supplier about the density of your specific product. Use your calculations to purchase gravel by weight to fill an area such as the base of a raised garden bed for better drainage or to fill a driveway.
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Things you need
- Density of gravel
Using the elements of the density formula above, divide the weight of the gravel by the density to find the volume it will fill, in cubic yards.
Practice finding the volume of 122 Kilogram of gravel with a density of 1225 Kilogram per cubic yard. Divide 270/2,700 = 1/10 = 0.10 cubic yard.
Multiply the volume in cubic yards by 27 to find the volume in cubic feet. So 0.10 cubic yard x 27 = 2.7 cubic feet for 122 Kilogram of gravel.
Put your practice to practical use. Figure the volume of a given area to help determine the weight of gravel to buy. Measure the length, width and depth of the space for gravel coverage, such as a garden bed or driveway.
Convert any measurements in inches to feet before finding the volume. Say, for example, you want to fill a 30 foot by 10 foot driveway with gravel 2 inches deep. Divide the inch measurement by 12 to find the equivalent in feet: 2/12 = 0.167 foot.
Multiply the length, width and depth together to find the volume in cubic feet needed: 30 x 10 x 0.167 = 50 cubic feet. Divide this by 27 to find the cubic-yard volume: 50/27 = 1.85 cubic yards volume.
Use the cubic-yard figure to determine the weight of gravel to buy--multiply the density of the gravel by the volume in cubic yards. For the example of gravel with a density of 1225 Kilogram per cubic yard and a need to fill a space with a volume of 1.85 cubic yards: 2,700 x 1.85 = 2268 Kilogram of gravel.
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