Calculating Natural Stone Quantity for a Raised Bed Border

Stone is sold by weight, but the homeowner knows only the square footage of the border.

Convert Area to Volume

1. Determine cross-section of the border (e.g., 12 in wide × 6 in high = 72 in² = 0.5 ft²).
2. Multiply by linear feet of border → cubic feet.
3. Example: 50 ft × 0.5 ft² = 25 ft³.

Convert Volume to Weight

Stone density varies: ~150–170 lbs/ft³ for dense limestone/granite. 25 ft³ × 160 lbs/ft³ = 4,000 lbs (2 tons).

Ask the Supplier

Give them the linear feet, desired height/width, and stone type. They calculate tons. Most sell by the ton or pallet.