Gravel Parking Pad Calculator
Calculate tons of gravel for a single-vehicle parking pad using its 1.4 tons per cubic yard density, plus total material cost.
How this calculator works
A gravel parking pad is filled by volume, so this calculator converts your pad’s length, width, and depth into cubic yards, then multiplies by gravel’s typical density of 1.4 tons per cubic yard to get the tons you need to order.
Formula: Cubic yards = (Pad length ft × Pad width ft × Depth ft) ÷ 27. Tons = Cubic yards × 1.4.
Worked example
A 20 ft × 12 ft single-vehicle parking pad at a 6-inch depth:
- Depth in feet: 6 ÷ 12 = 0.5 ft
- Cubic yards: (20 × 12 × 0.5) ÷ 27 ≈ 4.4444 yd³
- Tons: 4.4444 × 1.4 ≈ 6.22 tons
- At $45/ton, that’s $280.00 before waste.
Coverage reference
| Pad size | Tons needed (at 6 in) |
|---|---|
| 10 ft × 6 ft | 1.56 tons |
| 20 ft × 12 ft | 6.22 tons |
| 40 ft × 24 ft | 24.89 tons |
How to measure your parking pad
Measure the length and width of the parking footprint in feet, sizing it to at least 10 ft × 20 ft for a single full-size vehicle with comfortable door clearance. Use the compacted target depth rather than the loose depth you’ll spread, since gravel settles measurably once a vehicle’s weight and a plate compactor have worked it down.
Frequently asked questions
What's a good minimum size for a single-vehicle gravel parking pad?
10 ft × 20 ft is a common minimum single-stall footprint, giving a full-size vehicle enough width to park comfortably with door clearance and enough length to accommodate most sedans and trucks. Compact cars can get by with slightly less, but 10 × 20 is a safe standard to design around.
Why does a parking pad need more depth than a walkway but less than a driveway?
6 inches is a middle-ground depth — deep enough to support a parked (rather than constantly moving) vehicle's static weight without rutting, but generally less than the 8+ inches sometimes used for driveways that see continuous traffic and turning stress from steering while moving.
Do I need a compacted base under the top layer of gravel for a parking pad?
For long-term stability, yes — many parking pads use a compacted crusher run or road base sub-layer topped with a thinner layer of decorative or drainage gravel, rather than one single deep layer of the same loose material throughout.
How do I keep gravel from spreading out of a parking pad's edges?
Edging — pressure-treated timber, concrete curbing, or metal landscape edging installed around the pad's perimeter before adding gravel — keeps the stone contained under the repeated weight and slight lateral force of a parked vehicle's tires.
Does a gravel parking pad need a slope for drainage?
Yes, a slight slope (roughly 1-2%) away from any adjacent structure is standard, so rainwater runs off the pad rather than pooling on it or draining toward a building's foundation.
Should I add waste when ordering gravel for a parking pad?
Yes, the 10% waste toggle is a reasonable buffer for compaction settling and an uneven excavated area, both typical on a parking pad build.
Estimates only. Verify quantities with your supplier before purchasing.