Tons of Road Base per 100 Feet of 12 ft Road
Tons of road base per 100 feet of 12 foot road: about 33 tons at 6 inches deep. The strip is 12 ft × 100 ft = 1,200 square feet. Shoulders, pullouts and turnarounds add to the total; measure them separately.
Volume and tonnage calculator →Tons by depth
| Depth | Tons | Truckloads (~14 t) |
|---|---|---|
| 3 in | 17 | 2 |
| 4 in | 22 | 2 |
| 6 in | 33 | 3 |
| 8 in | 44 | 4 |
The math
- Area: 12 × 100 = 1,200 sq ft.
- Volume at 6 in: 1,200 × 0.500 = 600 cu ft (22 cubic yards).
- × 1.5 tons per yard = 33 tons.
Road section basics
At 12 feet wide, this is a single-lane private road or farm lane. 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.
Where road base fits
Works well for:
- Base under asphalt and concrete
- Gravel roads and drives
- Equipment and shed pads
Think twice 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 12x24 area at 3 inches takes about 4.0 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.
- Using inches as if they were feet. Depth has to be divided by 12 before you multiply; skipping that step inflates the order twelvefold.
- Skipping drainage. Water sitting under any surface softens the base and leads to ruts and potholes.
- Ignoring the base. A thin surface layer over soft soil fails early no matter how much material is on top.
Questions people ask
How many tons of road base per 100 feet of 12 ft road?
About 33 tons at 6 inches.
How many truckloads is that?
About 3 loads at roughly 14 tons each.
How many square feet is 100 feet of 12 ft road?
1,200 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 10 ft Road
- Tons of Road Base per Mile of 12 ft Road
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