Calculating How Much Gravel You Need for Your Driveway

What You'll Need
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When estimating the amount of gravel you need to cover your driveway, your estimate will depend on the type of gravel you choose, like pea or crushed gravel. Different grades are found in particles from fine to course, ranging from 2-64 mm. The volume of gravel must also be calculated according to the size of the rocks. Choose the gravel you'd like to use before digging the depth of your driveway, and then figure out how much you will need by using these simple calculations tips.

Understanding Size and Coverage

Gravel should be a minimum of 4-inches deep. The smaller the gravel, the more even the coverage will be. If rocks are on the larger side, allow for an additional 1/2 inch.

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.

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Measuring the Driveway

To measure the driveway in cubic feet, multiply the length by width by depth. For cubic yards, divide the total cubic feet by 27. Because one cubic yard of gravel is equal to 1.13 tons, you can multiply your total cubic yards by 1.13 to convert this measurement to tons.

Working With Gravel

When working with gravel for a driveway, calculate the measurements for an underlay separately. A road base is good for a bottom layer, while decorative gravel is best overlaid the road base. Using 2 inches of road base overlaid with 2 inches of gravel will greatly reduce your costs. Now, you're ready to build your gravel driveway.

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