![]() Our calculator adds 10% of gravel materials to allow for waste. Rather than try the math out above, just plug your measurements into our pea gravel calculator to determine how much gravel you need. 25 feet = 78.5 cubic feet in volume Using Our Gravel CalculatorĬalculations for squares and rectangles can be simple enough, but working with unusual shapes, especially triangles and circles, can add more complexity to your project estimates. You’d like to install gravel 3 inches (0.25 feet) deep. Imagine a circular project area with a 20-foot diameter. Then plug the diameter and the depth into the following formula: To calculate the volume of the circular space, you’ll need to measure the diameter (a straight line across the center of the circle). For simplicity, however, we will use 3.14 in our example below. ![]() For the most accurate results, use a calculator with a pi (π) symbol, rather than using 3.14. If you’re working with a circular shape, the calculations are even more complicated-but not impossible. * 0.25 feet = 37.5 cubic feet in volume Calculating Volume of a Circular Space You want your gravel to be 3 inches (0.25 feet) deep. The triangle’s base is 20 feet, and the height is 15 feet. To get the volume, take those two numbers, divide by 2, and multiply by your depth.įor example, a project area is shaped like a triangle. (The angle where the other two lines of the triangle meet.) Then measure the height-by drawing a perpendicular line from the base to the opposite vertex. Measure a single side of the triangle (we’ll call it the base). Triangle calculations are a little more complicated. You’d calculate:Ĥ0 feet * 20 feet * 0.25 feet = 200 cubic feet in volume Calculating Volume of a Triangular Space To calculate the volume of a square or rectangular space, just multiply length * width * depth.įor example, imagine a rectangular driveway that is 40 feet long and 20 feet wide, and you want 3 inches (0.25 feet) of depth for your gravel installation. Calculating Volume of a Square or Rectangular space A straightforward rectangle is easy enough to measure, but your project shape may be closer to a circle or a triangle-or may include different kinds of shapes that you’ll measure separately and add together. To standardize units of measurement, convert depth to feet by dividing by 12:Ĭalculating volume works a little differently depending on the shape of the project area. Depth is likely the only measurement you’ll have in inches. To calculate the volume of a project space, you’ll need to calculate the area of the space (usually length * width) and the depth of the space.įor most gravel installations, you’ll need to go between 2 and 4 inches in depth. Here’s how: Find a Gravel Installation Pro Near You Find Pros Step 1: Calculate the Volume of the Space While our gravel calculator is a helpful tool in estimating the amount of gravel you need, it’s possible to calculate the amount by hand using the measurements you collect. Instead, consider our landscaping rock calculator for larger rock fragments or our crushed stone calculator for projects utilizing crushed stone instead of gravel. If you’re using smaller or larger materials, don’t use this gravel calculator for your estimate. Smaller pieces would be considered pebbles, while larger material pieces would be considered rocks. Note: Our gravel calculator assumes gravel that is between 0.25 inches and 2 inches in diameter. If a number looks way off, remember to double-check that you’ve correctly converted it to the right unit of measure. When taking measurements, you might use various units of measure: inches, feet, and yards. Knowing how much gravel you need can help you better estimate how much a gravel driveway costs before hiring a contractor. Then you can input those measurements in our calculator to determine how much gravel your project requires. ![]()
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