Shed Base Gravel Calculator
Calculate aggregate for shed foundation pads with recommended 1-foot perimeter borders in cubic yards, tons, and bags.
1Project Shape & Dimensions
2Gravel Type & Density
The workhorse of aggregate. Angular, clean-washed 3/4-inch stones that lock together tightly. Perfect for driveway top coats, French drains, and concrete mixes.
3Gravel Depth & Compaction
Accounts for roller compaction settlement, uneven ground contours, and wheelbarrow spill.
Material & Delivery Cost Estimator
- Bulk delivery dump trucks usually require a 10–12 ft wide clearance path.
- Always verify if your quarry quotes in Tons or Cubic Yards.
- Order ~10% extra to prevent having to pay a second delivery fee for a half-ton deficit.
Popular Shed Sizes & Pad Tonnage Guide (4" Depth + 1ft Border)
| Shed Size | Pad Size (with border) | Square Feet | Crushed Stone (Tons) | 0.5 ft³ Bags |
|---|---|---|---|---|
| 8 × 10 ft Shed | 10 × 12 ft Pad | 120 sq ft | 1.63 yd³ | ~2.36 US Tons |
| 10 × 12 ft Shed | 12 × 14 ft Pad | 168 sq ft | 2.28 yd³ | ~3.31 US Tons |
| 10 × 16 ft Shed | 12 × 18 ft Pad | 216 sq ft | 2.93 yd³ | ~4.25 US Tons |
| 12 × 20 ft Shed | 14 × 22 ft Pad | 308 sq ft | 4.18 yd³ | ~6.06 US Tons |
Shed Base FAQs
Q: Why is a gravel pad better than concrete for a backyard shed?
A compacted gravel shed pad provides superior drainage (preventing wooden skids and floor joists from rotting in pooled rainwater), costs 60% less than a poured concrete slab, requires no concrete cure time, and does not crack from winter frost heaves.
Q: How much larger should a gravel pad be than the shed dimensions?
A gravel shed foundation should extend 12 inches (1 foot) beyond the shed walls on all four sides. For example, a 10×12 ft shed requires a 12×14 ft gravel pad (168 sq ft) framed with 4×6 or 6×6 pressure-treated timbers.
Q: What is the best gravel for a shed foundation?
Clean, angular 3/4" #57 crushed stone over a compacted subbase, or 4 to 6 inches of compacted Crusher Run (dense grade with fines) provides the optimal load-bearing support for heavy storage sheds and riding lawnmowers.