Tons of Gravel per 100 Feet of 12 ft Road

Tons of gravel per 100 feet of 12 foot road: about 21 tons at 4 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	16	2
4 in	21	2
6 in	31	3
8 in	41	3

The math

Area: 12 × 100 = 1,200 sq ft.
Volume at 4 in: 1,200 × 0.333 = 400 cu ft (15 cubic yards).
× 1.4 tons per yard = 21 tons.

What goes into the section

At 12 feet wide, this is a single-lane private road or farm lane. Plain gravel is a loose term. Yards use it for rounded bank or river stone as well as for crushed rock, so ask whether the load is washed, crushed or a mix before you lock in a tonnage. 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.

When to choose gravel

Good uses:

Rural driveways and lanes where low upfront cost matters
Drainage areas and around downspouts
Temporary access while a site is under construction

Less suited to:

Steep slopes, where loose stone washes downhill
Spots plowed often, since plows push gravel into the lawn
Areas next to doors, because stone tracks inside

Quick reference numbers

Per inch over 100 sq ft: about 0.43 tons of gravel (0.31 cubic yards).
Per inch over 1,000 sq ft: about 4.3 tons.
Another size for comparison: a 12x24 area at 4 inches takes about 5.0 tons.
Weight used here: about 1.4 tons per cubic yard.

Mistakes that throw off the order

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.
Ignoring the base. A thin surface layer over soft soil fails early no matter how much material is on top.
Assuming every supplier uses the same weight. Two yards selling the same product name can quote different tons per yard.

Questions people ask

How many tons of gravel per 100 feet of 12 ft road?

About 21 tons at 4 inches.

How many truckloads is that?

About 2 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.

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