How Much Crushed Stone for an 8x9 Hot Tub Pad?
An 8 by 9 foot hot tub pad covers 72 square feet. At 6 inches of crushed stone, plan on 1.33 cubic yards, or about 1.9 tons, which answers how much crushed stone for an 8x9 hot tub pad.
Volume and tonnage calculator →The math
- Area: 72.0 sq ft.
- Depth in feet: 6 ÷ 12 = 0.500 ft.
- Cubic yards: 72.0 × 0.500 ÷ 27 = 1.33 yd³.
- Tons: × about 1.4 tons per yard = 1.9 tons.
The crushed stone calculator does this for any size.
Related: How Much Gravel for an 8x9 Hot Tub Pad?
Crushed stone needed by depth
| Depth | Cubic yards | Tons of crushed stone | Tons +10% |
|---|---|---|---|
| 4 in | 0.89 | 1.2 | 1.4 |
| 6 in | 1.33 | 1.9 | 2.1 |
| 8 in | 1.78 | 2.5 | 2.7 |
Stone for a hot tub pad
A filled hot tub can weigh several tons, so the pad must be level and compacted solid. Many manufacturers accept a compacted stone base for some models, while others require concrete; follow your tub’s install guide, since that affects the warranty.
Related: How Much Crushed Stone for a 10x10 Hot Tub Pad?
Before the stone goes in
Clear vegetation, rake the soil level and compact it. Lay fabric overlapped at the seams and set edging before spreading the stone.
Buying the stone
Small dump trucks commonly carry around 5 to 10 tons and tri-axles more, but loads vary by truck and state, so ask the yard what fits in one trip. Crushed stone has angular faces that lock together under a compactor, which is why it holds a pad shape. Round up by about 10 percent for compaction and uneven ground.
Tools for the job
For anything bigger than a small path, rent a plate compactor; hand tampers cannot match it. A wheelbarrow, shovels, a hard rake and stakes with string are the rest of the kit. Wet the stone lightly before compacting so it binds.
Planning the cost
Quarries and landscape suppliers set their own prices, and they change by region and season. Get the price per ton, the delivery fee and the minimum order. If two products will both work, compare cost per square foot at your depth rather than cost per ton.
Questions people ask
How many tons of crushed stone for an 8x9 hot tub pad?
About 1.9 tons at 6 inches deep.
How many yards of crushed stone for an 8x9 hot tub pad?
About 1.33 cubic yards.
How many tons of crushed stone are in a cubic yard?
Roughly 1.4 tons for planning, but suppliers vary with stone size and moisture.
Should I put landscape fabric under the stone?
On soft or clay soil, a woven geotextile keeps stone from sinking into the dirt and makes the layer last longer.
Related guides
- Gravel Pad for a Hot Tub: Size, Depth, and Base
- Concrete Slab for a Hot Tub: Size, Thickness, Yards
- How Much Does a Ton of Gravel Cover? Depth Chart
- Tons to Cubic Yards for Gravel: Conversion Chart
- Crushed Stone vs Gravel: Differences and Best Uses
- Geotextile Fabric for Driveways: Woven vs Nonwoven and How Much You Need
- Compacting a Driveway Gravel Base in Lifts
- How Much Gravel for an 8x8 Hot Tub Pad?
- How Much Crusher Run for an 8x9 Hot Tub Pad?
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