Tons of Road Base per 100 Feet of 32 ft Road
Tons of road base per 100 feet of 32 foot road: about 89 tons at 6 inches deep. The strip is 32 ft × 100 ft = 3,200 square feet. On a job this long, half an inch of extra depth adds a lot of tons.
Volume and tonnage calculator →Tons by depth
| Depth | Tons | Truckloads (~14 t) |
|---|---|---|
| 3 in | 44 | 4 |
| 4 in | 59 | 5 |
| 6 in | 89 | 7 |
| 8 in | 119 | 9 |
The math
- Area: 32 × 100 = 3,200 sq ft.
- Volume at 6 in: 3,200 × 0.500 = 1,600 cu ft (59 cubic yards).
- × 1.5 tons per yard = 89 tons.
Road section basics
At 32 feet wide, this is a two-lane road width. 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. Crown the surface so water sheds to ditches on both sides.
Practical notes
- Phasing. Large tonnages are delivered over days; schedule spreading and compaction to keep up with trucks.
- Waste. Allow 5 to 10 percent.
- Hauling. Distance from the quarry or plant often costs as much as the material on long jobs; see asphalt hauling cost per ton.
Check other sizes with 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
Less suited to:
- 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.
Mistakes that throw off the order
- Skipping drainage. Water sitting under any surface softens the base and leads to ruts and potholes.
- Mixing up cubic yards and tons. Yards are volume, tons are weight; convert with the product’s weight per yard.
- Forgetting that compaction shrinks loose material. A loose 4-inch spread of a dense-graded stone may finish closer to 3 inches after rolling.
- 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 tons of road base per 100 feet of 32 ft road?
About 89 tons at 6 inches.
How many truckloads is that?
About 7 loads at roughly 14 tons each.
How many square feet is 100 feet of 32 ft road?
3,200 square feet.
Should I add extra for waste?
Yes, 5 to 10 percent is common.
Does this include the shoulders?
No. Measure shoulders and pullouts separately and add them.
Related guides
- How Many Tons of Gravel in a Dump Truck? Loads and Coverage
- Asphalt Hauling Cost Per Ton: What Drives the Delivered Price
- Crushed Stone vs Gravel: Differences and Best Uses
- Tons of Road Base per 100 Feet of 28 ft Road
- Tons of Road Base per Mile of 32 ft Road
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