To determine how much gravel you need for a shed foundation, you'll need to consider three main factors:
Calculation Steps
1. Calculate the Area: Multiply the length and width of the foundation area to get the total square footage.
Area = Length × Width
2. Convert to Cubic Feet: Multiply the area by the depth (convert inches to feet by dividing by 12).
Cubic Feet = Area × (Gravel Depth (in inches) / 12)
3. Convert Cubic Feet to Cubic Yards: There are 27 cubic feet in 1 cubic yard.
Cubic Yards = Cubic Feet / 27
4. Gravel Coverage: Most gravel is sold by cubic yards. Knowing the number of cubic yards you need will help you purchase the right amount.
Example
For a 10x12 foot shed foundation with a gravel depth of 4 inches:
Area = 10 × 12 = 120 sq ft
Cubic Feet = 120 × (4 / 12) = 40 cubic feet
Cubic Yards = 40 / 27 ≈ 1.48 cubic yards
So, you'd need approximately 1.5 cubic yards of gravel for a 10x12 shed with a 4-inch deep foundation.
| Gravel Size (inches) | Weight (tons per cubic yard) |
|---|---|
| 2 | 1.40 |
| 1.75 | 1.45 |
| 1.5 | 1.50 |
| 1.25 | 1.55 |
| 1 | 1.60 |
| 3/4 | 1.65 |
| 1/2 | 1.68 |
| 1/4 | 1.70 |
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