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How Much Gravel for a 8×10 French drain?

The answer

3.26 ton

For a 8×10 ft french drain at 12" depth, with 10% overage included. Estimated cost: $179 at US national average pricing.

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With 10% overage
Or in 0.5 cu ft bag
Estimated cost (US avg)

How we calculated this

  1. 1. Area: 8 × 10 = 80 sq ft
  2. 2. Volume: 80 × (12/12) = 80 cubic feet
  3. 3. Convert + overage: Add 10% for waste → 3.26 ton
  4. 4. Cost: 3.26 × $55.00 ≈ $179

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