How Much Gravel for a 20x40 RV Pad?
An RV parks for weeks at a time, so the pad needs real depth. A 20 by 40 foot pad at 6 inches is 14.81 cubic yards, about 20.7 tons of gravel, for how much gravel for a 20x40 RV pad.
Volume and tonnage calculator →The math
- Area: 800.0 sq ft.
- Depth in feet: 6 ÷ 12 = 0.500 ft.
- Cubic yards: 800.0 × 0.500 ÷ 27 = 14.81 yd³.
- Tons: × about 1.4 tons per yard = 20.7 tons.
The gravel calculator does this for any size.
Related: How Much Crushed Stone for a 20x40 RV Pad?
Gravel needed by depth
| Depth | Cubic yards | Tons of gravel | Tons +10% |
|---|---|---|---|
| 4 in | 9.88 | 13.8 | 15.2 |
| 6 in | 14.81 | 20.7 | 22.8 |
| 8 in | 19.75 | 27.7 | 30.4 |
| 12 in | 29.63 | 41.5 | 45.6 |
Depth for an RV pad
Plan on at least 6 inches of compacted stone. Heavier motorhomes, wet sites or soft soil call for 8 to 12 inches. Fabric under the stone stops it from pumping into the mud over time.
Related: How Much Crusher Run for a 20x40 RV Pad?
Size and access
A 20-foot width gives comfortable room to open slide-outs and walk around the rig. Add a wider entry flare where the pad meets the driveway so you can swing in without cutting across the lawn.
Drainage
Build the pad a little higher than the yard and slope it gently. Standing water under an RV softens the base and invites rust.
Getting it delivered
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. Gravel is a broad label, so confirm whether the yard means crushed or rounded stone and whether it carries fines. The scale ticket is the real weight; tons per yard here is a planning figure.
Questions people ask
How many tons of gravel for a 20x40 RV pad?
About 20.7 tons at 6 inches deep.
How thick should an RV gravel pad be?
At least 6 inches compacted; 8 to 12 on soft soil.
Do I need fabric under an RV pad?
On soft or clay soil, a woven geotextile helps keep the stone from sinking.
How many tons of gravel are in a cubic yard?
Roughly 1.4 tons for planning, but suppliers vary with stone size and moisture.
Do I need to compact it?
Yes for anything that carries weight. Compact in lifts of a few inches with a plate compactor.
Related guides
- 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 Crushed Stone for a 16x50 RV Pad?
- How Much Crusher Run for a 16x50 RV Pad?
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