How Much Does 30 Tons of Road Base Cover?
How much does 30 tons of road base cover depends on how deep you spread it. At about 1.5 tons per cubic yard, 30 tons is roughly 20.0 cubic yards. Spread 6 inches deep, that covers about 1,080 square feet. Go thinner and it covers more; go deeper and it covers less.
Volume and tonnage calculator →How the coverage is figured
- Tons to cubic yards: 30 ÷ 1.5 = 20.0 yd³.
- Cubic yards to cubic feet: × 27 = 540 cu ft.
- Divide by depth in feet: at 6 inches (0.500 ft), 540 ÷ 0.500 = 1,080 sq ft.
Coverage of 30 tons at different depths
| Depth | Square feet covered | Square yards |
|---|---|---|
| 4 in | 1,620 | 180 |
| 6 in | 1,080 | 120 |
| 8 in | 810 | 90 |
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.
What 30 tons looks like on site
30 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.
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 10x20 area at 4 inches takes about 3.7 tons.
- Weight used here: about 1.5 tons per cubic yard.
Common estimating mistakes
- 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.
- Ignoring the base. A thin surface layer over soft soil fails early no matter how much material is on top.
- Using inches as if they were feet. Depth has to be divided by 12 before you multiply; skipping that step inflates the order twelvefold.
Questions people ask
How many cubic yards is 30 tons of road base?
About 20.0 cubic yards at 1.5 tons per yard.
How many square feet does 30 tons of road base cover at 6 inches?
About 1,080 square feet.
How many square feet does 30 tons cover at 4 inches?
About 1,620 square feet.
How much does a yard of road base weigh?
About 1.4 to 1.65 compacted tons.
Will 30 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 28 Tons of Road Base Cover?
- How Much Does 29 Tons of Road Base Cover?
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