Lava Rock Calculator
Calculate cubic yards of lava rock for low-maintenance landscaping and fire pits
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Enter your dimensions above to see results
Tips & Notes
- •2"–3" depth is standard for decorative landscape beds.
- •Lava rock is extremely lightweight — roughly 1/2 the weight of regular gravel.
- •It won't decompose or float like organic mulch, making it a low-maintenance choice.
- •Red lava rock (cinders) is cheaper than black; both work well for fire pit surrounds.
- •Install landscape fabric underneath to prevent weeds from growing through.
Recommended Products
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Materials & Supplies
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Tools You'll Need
True Temper R6STFFEC 6 Cu. Ft. Steel Wheelbarrow — Never Flat Tire
Seamless steel tray, never-flat tire, steel handles — essential for moving bulk materials
$120Amazon
True Temper 8"x8" Steel Hand Tamper
Compact flat-plate tamper for packing gravel, sand, and soil by hand
$55Amazon
NoCry Professional Knee Pads
EVA foam, adjustable straps, hard cap protection for ground-level work
$30Amazon