Parking Pad Gravel Calculator (Car, RV & Boat)
Size a gravel parking pad for daily cars, motorhomes, or boat trailers using load-appropriate base depth.
1. Select Project Shape
2. Enter Dimensions
3. Select Gravel Aggregate & Density
4. Add Waste & Compaction Buffer
Gravel Layer & Excavation Cross-Section Simulator
Visualize multi-layer ground excavation, plate compaction settling, and dump truck hauling logistics in real-time.
To achieve a final compacted depth of 6.0 inches, you must spread 7.1 inches of loose uncompacted aggregate before running the plate compactor.
Recommended Depth & Base Specifications for Parking Pad Gravel Calculator
Selecting the proper installation depth is the single most critical factor in preventing premature rutting, sinking, or weed breakthrough.
| Layer / Application | Recommended Depth | Stone Aggregate Type | Contractor Notes |
|---|---|---|---|
| Daily Driver Car Pad | 4 to 6 Inches | Crusher Run Base + #57 Surface | A 20x12 pad at 6 inches needs roughly 4.44 cubic yards or 6.7 tons of crusher run. |
| RV / Motorhome Pad | 8 to 10 Inches | #3 Base + Crusher Run | Use woven geotextile and two compacted lifts to prevent pointed trailer jacks and tires from punching through. |
| Boat Trailer Pad | 6 Inches | Crusher Run | Crown the pad slightly so trailer bunks and tires drain rather than sitting in water. |
💡 Contractor Installation Pro Tips
- Put a 1-inch crown or cross-slope on the pad so water never pools beneath parked tires.
- For RVs heavier than 15,000 lbs, compact each gravel lift in 3-inch maximum layers with a plate compactor.
Frequently Asked Questions About Parking Pad Gravel Calculator
How much gravel for a 20x20 parking pad?
At 6 inches deep, 400 sq ft equals 7.41 cubic yards. Using crusher run at 3,000 lbs/yd³ plus a 15% compaction allowance, order about 12.3 tons.
Can I park an RV on gravel?
Yes, if the pad has 8 to 10 inches of compacted aggregate over geotextile fabric and firm native soil. Poorly prepared thin gravel will rut under tires and leveling jacks.
Missing a Stone Type or Have Feedback?
We update density presets and formulas regularly based on local quarry feedback.