How Much Does 20 Tons of Road Base Cover?
How much does 20 tons of road base cover depends on how deep you spread it. At about 1.5 tons per cubic yard, 20 tons is roughly 13.3 cubic yards. Spread 6 inches deep, that covers about 720 square feet. Every added inch of depth cuts the coverage noticeably.
Volume and tonnage calculator →How the coverage is figured
- Tons to cubic yards: 20 ÷ 1.5 = 13.3 yd³.
- Cubic yards to cubic feet: × 27 = 360 cu ft.
- Divide by depth in feet: at 6 inches (0.500 ft), 360 ÷ 0.500 = 720 sq ft.
Coverage of 20 tons at different depths
| Depth | Square feet covered | Square yards |
|---|---|---|
| 4 in | 1,080 | 120 |
| 6 in | 720 | 80 |
| 8 in | 540 | 60 |
About road base
Road base (also called base rock, ABC, or Class 2 base in different states) is a graded mix of stone and fines made to compact into a load-bearing layer. 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 20 tons looks like on site
20 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
Best suited to:
- 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 3 inches takes about 2.8 tons.
- Weight used here: about 1.5 tons per cubic yard.
Mistakes that throw off the order
- 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.
- Ordering exactly the math. Uneven ground and spillage nearly always need a little more than the flat calculation.
- Skipping drainage. Water sitting under any surface softens the base and leads to ruts and potholes.
Questions people ask
How many cubic yards is 20 tons of road base?
About 13.3 cubic yards at 1.5 tons per yard.
How many square feet does 20 tons of road base cover at 6 inches?
About 720 square feet.
How many square feet does 20 tons cover at 4 inches?
About 1,080 square feet.
How much does a yard of road base weigh?
About 1.4 to 1.65 compacted tons.
Will 20 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 18 Tons of Road Base Cover?
- How Much Does 19 Tons of Road Base Cover?
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