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Stack of large rocks with a clear blue sky in the background
Close-up of a pile of rocks with varying sizes and colors.
Scenic view of a rocky landscape with mountains in the distance under a blue sky.
Stack of large rocks with a clear blue sky in the background
Close-up of a pile of rocks with varying sizes and colors.
Scenic view of a rocky landscape with mountains in the distance under a blue sky.

Black Jack Basalt Boulders

These dark, charcoal-to-black boulders provide a bold, volcanic aesthetic that stands out sharply against lighter decorative gravels.

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Materials Calculator

These calculators are designed to give approximate amounts only. They will help you determine the quantity you need; however, variations in subgrade, compaction of subgrade, or inaccurate measurements, even a quarter of an inch of depth, can make a difference.

Type of material

Which type of materials are you looking to purchase?


Enter your dimensions



For gravel and decorative rock, these are recommended depths assuming normal conditions:
1 inch and below need to be around 2 inches deep, 1.5–2 inch gravel should be 3 inches, and 2–4 inch should be 4 inches deep.
The bigger the gravel size, the deeper it needs to be for good coverage.


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