Tons of Gravel per 100 Feet of 20 ft Road

Tons of gravel per 100 feet of 20 foot road: about 35 tons at 4 inches deep. The strip is 20 ft × 100 ft = 2,000 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	26	2
4 in	35	3
6 in	52	4
8 in	69	5

The math

Area: 20 × 100 = 2,000 sq ft.
Volume at 4 in: 2,000 × 0.333 = 667 cu ft (25 cubic yards).
× 1.4 tons per yard = 35 tons.

Road section basics

At 20 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

Works well for:

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

Think twice for:

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 20x25 area at 3 inches takes about 6.5 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.
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.
Measuring only the main rectangle. Aprons, turnouts and curved edges add real square footage.

Questions people ask

How many tons of gravel per 100 feet of 20 ft road?

About 35 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 20 ft road?

2,000 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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