Tons of Gravel per 100 Feet of 18 ft Road

Tons of gravel per 100 feet of 18 foot road: about 31 tons at 4 inches deep. The strip is 18 ft × 100 ft = 1,800 square feet. Long runs magnify small depth changes, so pin the depth down before ordering.

Volume and tonnage calculator →

Tons by depth

Depth	Tons	Truckloads (~14 t)
3 in	23	2
4 in	31	3
6 in	47	4
8 in	62	5

The math

Area: 18 × 100 = 1,800 sq ft.
Volume at 4 in: 1,800 × 0.333 = 600 cu ft (22 cubic yards).
× 1.4 tons per yard = 31 tons.

Building a road this width

At 18 feet wide, two cars can meet with care. 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

Best suited to:

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 8x16 area at 2 inches takes about 1.1 tons.
Weight used here: about 1.4 tons per cubic yard.

Common estimating mistakes

Using inches as if they were feet. Depth has to be divided by 12 before you multiply; skipping that step inflates the order twelvefold.
Ordering exactly the math. Uneven ground and spillage nearly always need a little more than the flat calculation.
Measuring only the main rectangle. Aprons, turnouts and curved edges add real square footage.
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 18 ft road?

About 31 tons at 4 inches.

How many truckloads is that?

About 3 loads at roughly 14 tons each.

How many square feet is 100 feet of 18 ft road?

1,800 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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