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how much stone do i need

You can figure out how much stone you need with a simple volume formula and one extra safety step for waste.

Quick Scoop

For most projects (drive, path, garden bed), you can use this rule of thumb:

  1. Measure your area
    • Length in feet
    • Width in feet
    • Desired depth in feet (remember: 3 inches = 0.25 feet, 4 inches ≈ 0.33 feet, 6 inches = 0.5 feet)
  1. Calculate volume in cubic yards
    • Use:

Cubic yards=L×W×D27\text{Cubic yards}=\frac{L\times W\times D}{27}Cubic yards=27L×W×D​

where LLL, WWW, and DDD are in feet.

  1. Add 10% for waste
    • Stones settle, some break, and you’ll cut/trim.
    • Multiply your result by 1.1 to allow for a 10% waste factor.
  1. Convert to tons (if needed)
    • Crushed stone/gravel typically weighs about 1.4–1.7 tons per cubic yard (many pros use 1.5 as a quick average).
 * Use:

Tons≈Cubic yards×1.5\text{Tons}\approx \text{Cubic yards}\times 1.5Tons≈Cubic yards×1.5

Example you can copy

Say you’re building a small gravel path:

  • Length: 20 ft
  • Width: 4 ft
  • Depth: 3 in (0.25 ft)
  1. Volume in cubic yards:

20×4×0.2527=2027≈0.74 cubic yards\frac{20\times 4\times 0.25}{27}=\frac{20}{27}\approx 0.74\text{ cubic yards}2720×4×0.25​=2720​≈0.74 cubic yards

  1. Add 10% waste:

0.74×1.1≈0.81 cubic yards0.74\times 1.1\approx 0.81\text{ cubic yards}0.74×1.1≈0.81 cubic yards

  1. In tons (using 1.5 tons per cubic yard):

0.81×1.5≈1.2 tons0.81\times 1.5\approx 1.2\text{ tons}0.81×1.5≈1.2 tons

So you’d order about 1.0–1.5 tons depending on how generous you want to be.

Different types of stone

The exact number changes slightly by stone type because of different densities:

  • Crushed stone / gravel (≤2"): about 1.4–1.7 tons per cubic yard
  • Larger rock / riprap: about 1.7–2 tons per cubic yard
  • Lightweight lava rock: sometimes under 1 ton per cubic yard

If you know the density from your supplier (e.g., in tons per cubic yard), just do:

Tons=Cubic yards×Density (tons per yd³)\text{Tons}=\text{Cubic yards}\times \text{Density (tons per yd³)}Tons=Cubic yards×Density (tons per yd³)

If you tell me your project

If you share:

  • What you’re doing (driveway, path, garden, wall, etc.)
  • Length, width, and depth
  • Type of stone (gravel, decorative rock, riprap, etc.)

I can run the numbers step by step and tell you how much stone you need in both cubic yards and tons , plus a sensible amount of extra so you don’t run short.

Information gathered from public forums or data available on the internet and portrayed here.