How Much Gravel for a Shed Base?
Quick Answer
A gravel shed base should extend about 1 foot beyond the shed on each side and be 4 to 6 inches deep. For a 10×12 shed, the 12×14 gravel pad at 4 inches needs 2.07 cubic yards (about 2.9 tons) of crushed stone.
- 10×12 shed (12×14 pad, 4 in): 2.07 cubic yards / 2.9 tons
- Extend pad 1 ft beyond shed on all sides
- Use 4–6 inches of #57 or 3/4-inch crushed stone
- Gravel cost: $85–$145 for a typical shed base
Formula
Multiply the pad area by depth in inches, then divide by 324 to get cubic yards. Multiply cubic yards by 1.4 to convert to tons for crushed stone.
Step-by-Step Calculation
- 1
Pad size (10×12 shed + 1 ft each side)
12 × 14 = 168 square feet
- 2
Volume at 4 inches
(168 × 4) ÷ 324 = 2.07 cubic yards
- 3
Convert to tons
2.07 × 1.4 = 2.9 tons
- 4
Cost estimate
2.9 tons × $30–$50 = $87–$145
Gravel for a Shed Base by Size (4-inch depth)
| Shed Size | Gravel Pad | Cubic Yards | Tons | Cost* |
|---|---|---|---|---|
| 8×8 | 10×10 | 1.23 | 1.7 | $51–$85 |
| 8×10 | 10×12 | 1.48 | 2.1 | $63–$105 |
| 10×12 | 12×14 | 2.07 | 2.9 | $87–$145 |
| 12×16 | 14×18 | 3.11 | 4.4 | $132–$220 |
*Crushed stone at $30–$50 per ton delivered. Use 6 inches of depth on soft or poorly drained soil.
Pro Tips
- Extend the gravel pad 12 inches beyond the shed footprint on all sides — so a 10×12 shed gets a 12×14 gravel pad. The overhang prevents rainwater dripping off the roof from splashing mud onto the shed walls and provides stable ground for walking around the shed.
- Use 3/4-inch crushed stone (not river rock or pea gravel) for shed bases. Crushed angular stone locks together when compacted and stays put — rounded stone shifts under load and creates an unstable surface that the shed slowly settles into.
- Lay landscape fabric over the excavated area before placing gravel. This prevents soil from migrating up into the gravel layer over time, which would eventually soften the base and allow settling. Overlap fabric seams by 12 inches.
- Compact the gravel in 2-inch lifts using a plate compactor — do not dump all 4 inches and try to compact at once. The bottom layer will remain loose and you will see settlement within the first year.
Key Cost Factors
- Crushed stone for a 12×14 pad at 4 inches deep (2.07 cubic yards) costs $60–$95 for materials plus $50–$75 delivery. Total: $110–$170. At 6-inch depth (3.1 cubic yards): $90–$140 + delivery = $140–$215. The 6-inch depth is recommended for sheds storing heavy items like mowers.
- Many shed kit instructions suggest skipping the gravel base entirely — do not listen to them. A proper gravel base adds $110–$215 to a shed project but prevents thousands in damage from settling, rot, and moisture wicking. It also makes the shed level, which keeps doors operating properly.
Common Mistakes to Avoid
- Making the pad too small. A shed gravel base should extend about 12 inches beyond the shed footprint on all sides so rain drips onto gravel, not eroding soil at the edge.
- Using rounded pea gravel. Rounded stone shifts under load and never locks together. A shed base needs angular crushed stone (like 3/4-inch minus) that compacts firm.
- Skipping compaction. Dumping gravel without compacting in layers leaves a base that settles unevenly, and the shed floor follows it out of level.
- Going too thin. A shed base needs about 4–6 inches of compacted gravel; a thin layer sinks into the soil and fails to drain.
Related Project Considerations
- Level and excavate first. Strip the sod and level the ground before adding gravel — building a base on organic topsoil leads to settling and rot.
- Contain the edges. Use pressure-treated timbers or a paver border to keep the gravel pad from spreading and to define a clean, stable edge.
- Plan for drainage. Site the shed base slightly high and sloped so water runs away; a well-drained gravel pad keeps the shed floor dry and rot-free.
Frequently Asked Questions
What kind of gravel is best for a shed base?
Use angular crushed stone such as #57 or 3/4-inch clean gravel. Angular pieces interlock under compaction, creating a stable, well-draining base that does not shift. Avoid rounded pea gravel, which rolls under weight and creates an unstable surface. Some builders use a layer of larger #3 stone at the bottom for extra drainage, topped with the finer crushed stone for a level finish.
How deep should a gravel shed base be?
Four inches is fine for small sheds (under 100 sq ft) on firm, well-drained soil. Use 6 inches for larger sheds, heavy equipment storage, or sites with soft or clay ground that holds water. Compact the gravel in 2-inch lifts using a plate compactor or hand tamper, and check for level after each lift — getting the base flat now prevents the shed from racking or binding doors later.
Should a gravel shed pad be bigger than the shed?
Yes. Extend the pad at least 1 foot beyond the shed footprint on every side, and 2 feet on the door side if possible. This overhang keeps roof runoff from pooling at the foundation, prevents the pad edges from washing out, and gives you a clean apron to step onto when entering the shed. A pad that is flush with the walls invites water damage to the bottom framing and sill plates.