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How Much Gravel for a 4×6 French drain?

The answer

0.98 ton

For a 4×6 ft french drain at 12" depth, with 10% overage included. Estimated cost: $54 at US national average pricing.

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

How we calculated this

  1. 1. Area: 4 × 6 = 24 sq ft
  2. 2. Volume: 24 × (12/12) = 24 cubic feet
  3. 3. Convert + overage: Add 10% for waste → 0.98 ton
  4. 4. Cost: 0.98 × $55.00 ≈ $54

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