How Much Does 28 Tons of Road Base Cover?
How much does 28 tons of road base cover depends on how deep you spread it. At about 1.5 tons per cubic yard, 28 tons is roughly 18.7 cubic yards. Spread 6 inches deep, that covers about 1,008 square feet. Halve the depth and you roughly double the area.
Volume and tonnage calculator →How the coverage is figured
- Tons to cubic yards: 28 ÷ 1.5 = 18.7 yd³.
- Cubic yards to cubic feet: × 27 = 504 cu ft.
- Divide by depth in feet: at 6 inches (0.500 ft), 504 ÷ 0.500 = 1,008 sq ft.
Coverage of 28 tons at different depths
| Depth | Square feet covered | Square yards |
|---|---|---|
| 4 in | 1,512 | 168 |
| 6 in | 1,008 | 112 |
| 8 in | 756 | 84 |
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 runs about 1.4 to 1.65 compacted tons per cubic yard, so treat the table as a planning range rather than an exact figure.
Planning around 28 tons
28 tons will usually take two or more truck loads, though legal limits vary by truck and state. Spread from the pile with a loader, skid steer or wheelbarrow, then rake to depth before compacting if the material calls for it.
- Check depth as you go. Stakes marked at the target depth help keep the spread even.
- Expect some loss. Compaction and uneven ground use more than the flat-math figure. Keep about 10 percent in reserve.
- Ask about moisture. Wet material weighs more, so a ton of it covers less.
To run your own numbers, use the volume and tonnage calculator.
Good and poor uses for road base
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 15x30 area at 4 inches takes about 8.3 tons.
- Weight used here: about 1.5 tons per cubic yard.
Common estimating mistakes
- Skipping drainage. Water sitting under any surface softens the base and leads to ruts and potholes.
- Forgetting that compaction shrinks loose material. A loose 4-inch spread of a dense-graded stone may finish closer to 3 inches after rolling.
- Mixing up cubic yards and tons. Yards are volume, tons are weight; convert with the product’s weight per yard.
- Ordering exactly the math. Uneven ground and spillage nearly always need a little more than the flat calculation.
Questions people ask
How many cubic yards is 28 tons of road base?
About 18.7 cubic yards at 1.5 tons per yard.
How many square feet does 28 tons of road base cover at 6 inches?
About 1,008 square feet.
How many square feet does 28 tons cover at 4 inches?
About 1,512 square feet.
How much does a yard of road base weigh?
About 1.4 to 1.65 compacted tons.
Will 28 tons fit in one truck?
It depends on the truck. Single-axle dump trucks often carry under 10 tons and tandems around 13 to 16; your supplier will know their limits.
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 26 Tons of Road Base Cover?
- How Much Does 27 Tons of Road Base Cover?
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