Calculate gravel volume and weight for rectangular, circular or triangular areas, with a choice of common gravel material types, each with its own typical density.
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Our original Gravel Calculator handles rectangular areas with a single fixed gravel density. This calculator adds support for circular areas (like a round fire pit surround) and triangular areas (like an odd-shaped corner bed), and lets you choose from several common gravel material types, crushed stone, pea gravel, river rock, or decomposed granite, each with its own typical density, so the weight estimate better matches the specific material you're buying.
Rectangle area is length × width. Circle area uses π × radius², with the diameter you enter divided by 2 to get the radius. Triangle area is 0.5 × base × height. Once the area is found, it's multiplied by depth (converted from inches to feet) to get volume, then converted to cubic yards and weight using your chosen gravel type's density.
For a rectangular area 10 ft × 8 ft, 3 inches deep, using crushed stone (density 1.4 tons per cubic yard): area = 10 × 8 = 80 sq ft. Volume = 80 × (3 ÷ 12) = 20 cubic feet, or 20 ÷ 27 ≈ 0.741 cubic yards. Weight = 0.741 × 1.4 ≈ 1.04 tons needed.
Entering a circle's radius instead of its diameter, this calculator's first field expects the diameter for circles, entering the radius by mistake would produce an area only a quarter of the correct size.
Assuming all gravel types weigh the same per cubic yard, density varies meaningfully by material, pea gravel, river rock, crushed stone and decomposed granite each have their own typical density, selecting the wrong type in this calculator gives a weight estimate for the wrong material.
Entering depth in feet instead of inches, this calculator's depth field expects inches, entering the intended feet value directly would inflate the volume estimate twelvefold.
Crushed stone (angular, interlocking) is common for driveways and drainage. Pea gravel (small, rounded) is popular for pathways and decorative beds. River rock (larger, rounded) is often used decoratively. Decomposed granite is popular for pathways with a more natural, compactable surface. Each has a slightly different typical density, reflected in this calculator's weight estimate.
Break the area down into multiple rectangles, circles or triangles, calculate each separately, and add the results together for a combined estimate.
No, for a circle, enter only the diameter in the first field, the second dimension field is ignored for circular areas.
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