How Much Road Base for a 18x50 Driveway?
How much road base for a 18x50 driveway: at 4 inches deep you need about 11.11 cubic yards, which is roughly 16.7 tons at 1.5 tons per yard. The driveway covers 900 square feet, so every inch of depth adds about 2.78 yards.
Volume and tonnage calculator →The math for a 18x50 driveway
- Area: 18 × 50 = 900 sq ft.
- Depth in feet: 4 ÷ 12 = 0.333 ft.
- Cubic feet: 900 × 0.333 = 300.0 cu ft.
- Cubic yards: ÷ 27 = 11.11 yd³.
- Tons: × 1.5 = 16.7 tons.
The volume and tonnage calculator does this for any size.
Road base needed by depth
| Depth | Cubic yards | Tons (approx.) | Tons +10% |
|---|---|---|---|
| 4 in | 11.11 | 16.7 | 18.3 |
| 6 in | 16.67 | 25.0 | 27.5 |
| 8 in | 22.22 | 33.3 | 36.7 |
About road base
Road base is meant to be compacted at close to the right moisture. Dry base rock does not lock up well; a light spray of water before rolling helps. Weight per yard is a planning number; the scale ticket at the yard is the real one.
Preparing the driveway
Strip sod and soft topsoil, grade for drainage and compact the subgrade before any stone goes down. Gravel drives last longer with a compacted base layer under the top stone and a slight crown so water runs off. Since the driveway carries car and truck traffic, a little extra depth is cheap insurance.
Ordering tips
- Round up. Compaction and uneven ground eat material. Adding about 10 percent is common.
- Delivery size. 18.3 tons may take more than one typical dump truck load; small loads may carry a delivery fee. See how many tons of gravel in a dump truck.
- Bulk vs bags. At this size bulk delivery is usually the practical choice.
- Where it drops. Have the truck dump as close to the driveway as firm ground allows.
Where road base fits
Works well for:
- Base under asphalt and concrete
- Gravel roads and drives
- Equipment and shed pads
Poor fit for:
- Drainage layers
- Decorative surfaces
- Surfaces that will stay uncompacted
Quick reference numbers
- Per inch over 100 sq ft: about 0.46 tons of road base (0.31 cubic yards).
- Per inch over 1,000 sq ft: about 4.6 tons.
- Another size for comparison: a 14x28 area at 2 inches takes about 3.6 tons.
- Weight used here: about 1.5 tons per cubic yard.
Mistakes that throw off the order
- Assuming every supplier uses the same weight. Two yards selling the same product name can quote different tons per yard.
- Measuring only the main rectangle. Aprons, turnouts and curved edges add real square footage.
- Ordering exactly the math. Uneven ground and spillage nearly always need a little more than the flat calculation.
- Forgetting that compaction shrinks loose material. A loose 4-inch spread of a dense-graded stone may finish closer to 3 inches after rolling.
Questions people ask
How many tons of road base for a 18x50 driveway?
About 16.7 tons at 4 inches deep, or 18.3 tons with 10 percent extra.
How many cubic yards is a 18x50 driveway at 4 inches?
About 11.11 cubic yards.
How much does a cubic yard of road base weigh?
Usually around 1.4 to 1.65 compacted tons, depending on stone size, fines and moisture.
How deep should road base be for a driveway?
The table above shows 4 to 8 inches. Shallower depths suit top dressing; deeper depths suit new installs and heavier use.
How many square feet is 18x50?
900 square feet.
Related guides
- Crushed Stone vs Gravel: Differences and Best Uses
- Tons to Cubic Yards for Gravel: Conversion Chart
- How Many Tons of Gravel in a Dump Truck? Loads and Coverage
- How Much Does a Ton of Gravel Cover? Depth Chart
- How Much Road Base for a 18x40 Driveway?
- How Much Road Base for a 18x45 Driveway?
As an Amazon Associate, AsphaltTons.com earns from qualifying purchases. Product links below are sponsored.