Shed Base Gravel Depth Guide
Plan shed base gravel depth by pad size, soil, drainage, compaction, geotextile, concrete thickness, delivery, and quote scope.
Shed base gravel depth is separate from concrete thickness. A quote should make excavation, gravel type, compacted depth, geotextile if needed, drainage, delivery, compaction, cleanup, and exclusions visible before the concrete pad is poured.
Use the Concrete Shed Base Calculator for concrete volume and the Gravel Base Calculator for Concrete for base quantity. Compare installed bids with the Concrete Quote Reviewer and write scope with the Concrete Proposal Kit.
Competitor pages such as ConcreteCalculatorMax's gravel calculator and ConcreteCalculator.pro's concrete aggregate calculator cover material quantity. The shed-base gap is compacted depth, drainage, and quote scope.
Quick answer
For gravel base planning:
gravel cubic feet = length ft x width ft x gravel depth in / 12
Then convert to cubic yards:
gravel cubic yards = gravel cubic feet / 27
Use compacted depth in the quote, not loose dumped depth. Confirm soil, drainage, compaction, frost, and local requirements with qualified local professionals.
Gravel depth quote inputs
| Input | Why it matters | What to ask |
|---|---|---|
| Pad size | Base may extend beyond the concrete. | What base footprint is included? |
| Compacted depth | Loose gravel compacts down. | Is the quoted depth compacted depth? |
| Aggregate type | Stone size and fines affect compaction and drainage. | What material is included? |
| Excavation | Removing soil is often separate. | What excavation and spoil handling are included? |
| Geotextile | Weak or wet soil may need separation fabric. | Is fabric included or excluded? |
| Compaction | Base quality depends on compaction. | What equipment and lift depth are included? |
| Drainage | Water can undermine the pad. | Where does water go? |
For recycled material, review the Crushed Concrete Base Quote Checklist.
Example: 8x10 shed base gravel
Assume the base footprint is 8 ft x 10 ft and gravel depth is 4 in:
8 x 10 x 4 / 12 = 26.67 ft3
26.67 / 27 = 0.99 yd3
That is a material planning number before compaction, waste, delivery, and site-specific base extension.
Gravel depth quote worksheet
| Quote line | Bid A | Bid B | Notes |
|---|---|---|---|
| Base footprint | Same as slab or extended beyond edges. | ||
| Excavation | Depth, spoil, roots, soft soil, haul-off. | ||
| Gravel material | Stone type, recycled material, fines. | ||
| Compacted depth | Final compacted depth, not loose depth. | ||
| Geotextile | Included, excluded, or allowance. | ||
| Compaction method | Plate compactor, lifts, proofing. | ||
| Drainage | Slope, outlet, wet spots, grading. | ||
| Cleanup | Extra gravel, soil, yard repair. |
FAQ
Is gravel depth the same as concrete thickness?
No. Gravel depth is the compacted base below the concrete. Concrete thickness is the slab depth above the base.
Should the gravel base extend beyond the shed slab?
Sometimes. The base footprint may extend beyond concrete edges for support or drainage, depending on design and site conditions.
What does compacted depth mean?
It means the final depth after the gravel is placed and compacted. Loose dumped depth can be greater than compacted depth.
Should geotextile fabric be included?
It depends on soil and drainage. The quote should state whether fabric is included, excluded, or an allowance.
Is this soil design advice?
No. Confirm base depth, soil, compaction, drainage, and local requirements with qualified local professionals.
Next step
Estimate gravel with the Gravel Base Calculator for Concrete, then compare base-prep scope in the Concrete Quote Reviewer.
Quote planning next step
Turn this guide into a concrete buying check
Run the matching calculator, then compare ready-mix, bagged concrete, delivery fees, access needs, and quote gaps before you buy materials or approve a contractor number.