Article — Crushed Stone Calculator
Crushed Stone Calculator: Tons and Cubic Yards by Area
A crushed stone calculator converts a project area and depth into cubic yards and tons of aggregate, using a density of 1.35 short tons per cubic yard for Stone #57, the most common driveway grade. A 200-square-foot patio at 4 inches deep needs about 2.5 cubic yards or 3.3 tons of crushed stone before waste.
Crushed stone is the largest non-fuel mineral commodity produced in the United States. The U.S. Geological Survey reported about 1.5 billion metric tons of crushed-stone production in 2023, valued at roughly $24 billion. Most of it ends up in road base, concrete aggregate, and residential drainage projects.
What is crushed stone
Crushed stone is rock that has been mechanically broken into angular fragments and sorted by size. Limestone, granite, basalt, and traprock are the most common parent rocks. The angular faces let particles interlock when compacted, which is why crushed stone holds shape under traffic. Rounded river gravel, by contrast, behaves like ball bearings and migrates under load.
Sizing is standardized in the United States by AASHTO M43, the Standard Specification for Sizes of Aggregate for Road and Bridge Construction. Each numbered grade has a defined sieve range, so Stone #57 from any quarry meets the same specification.
USGS classifies crushed stone as a "mineral commodity of strategic importance" because every mile of paved road in the U.S. uses roughly 38,000 tons of aggregate. Without crushed stone, modern road and rail networks would be impossible to build economically.
The crushed stone formula
The calculator runs four steps. Convert depth from inches to feet, multiply by area to get cubic feet, divide by 27 to get cubic yards, then multiply by density to get tons.
Depth (ft) = Depth (in) ÷ 12Volume (ydÂł) = Area (ft²) × Depth (ft) ÷ 27Weight (tons) = Volume (ydÂł) × Density (t/ydÂł)Order qty = Weight × (1 + waste%)One short ton equals 2,000 pounds. One cubic yard of #57 stone weighs about 2,700 pounds. A handy rule: one cubic yard of typical crushed stone covers 100 square feet at 3 inches deep.
AASHTO crushed stone sizes
The American Association of State Highway and Transportation Officials publishes numbered size designations that quarries follow nationwide. The numbers correspond to sieve openings, not particle diameter.
- #57 = 1”“1.5 in, driveway and base, the most popular grade
- #411 = 0”“2 in dense-graded, compacts tight, base layer
- #1 = 2”“4 in large stone, drainage and ballast
- #8 = 3/8”“1/2 in fine, pathways and decorative finish
- #304 = 0”“1 in limestone base, sub-base under concrete
- Crusher Run = 0”“3/4 in mixed, base and stabilization
Crushed stone density
Density varies by parent rock and moisture content. The numbers in the calculator are loose-pile averages reported by AASHTO and major aggregate producers.
Wet stone weighs 5”“10% more than dry. Compacted material occupies 20”“30% less volume than the loose pile delivered from the truck. Both effects argue for ordering 10”“15% more than the bare calculation, then compacting in lifts.
Crushed stone for driveways
A residential driveway needs at least 4 inches of total stone over a stable subgrade. The standard buildup is two lifts: 2 inches of Stone #411 or crusher run compacted as a base, then 2 inches of Stone #57 on top.
For a 20 × 40 ft driveway at this spec, the totals are roughly 4.94 cubic yards (≈6.2 tons) of #411 and 4.94 cubic yards (≈6.7 tons) of #57, plus 10% waste. Heavier vehicles or soft clay subgrades call for 6”“8 inches in two or three lifts.
Lay landscape fabric between the subgrade and the base course. It stops soil pumping up through the stone when wet, doubling the working life of the driveway.
Crushed stone coverage chart
Use this chart for quick estimates with Stone #57 at 1.35 tons per cubic yard.
- 100 ft² @ 2 in = 0.62 yd³ ≠0.8 ton
- 100 ft² @ 4 in = 1.23 yd³ ≠1.7 tons
- 500 ft² @ 4 in = 6.17 yd³ ≠8.3 tons
- 1,000 ft² @ 4 in = 12.35 yd³ ≠16.7 tons
- 1,000 ft² @ 6 in = 18.52 yd³ ≠25 tons
- 5,000 ft² @ 4 in = 61.7 yd³ ≠83 tons
Waste and compaction
The standard 10% waste factor covers spillage during truck unloading, edge feathering, and minor over-ordering. Compaction is a separate adjustment. A plate compactor or roller reduces loose stone volume by 20”“30%, so a 10-yard pile becomes 7”“8 yards of finished base.
Placing Stone #57 directly on dirt without a base of #411 or crusher run leads to ruts within a season. The angular #57 pieces sink into soft soil where they cannot interlock. Always lay a 2-inch base and compact before the top course.
Common crushed-stone mistakes
Most cost overruns trace back to one of these errors.
- Ignoring waste = under-ordering by 10”“15%
- Skipping the base = top course sinks into soil
- Wrong size for use = #1 on a driveway leaves loose surface
- No compaction = ruts and rolling within months
- Mismatched delivery = quarry mixes vary by region
- No fabric = soil pumps up between stones over time
Stick to AASHTO grades, plan for compaction, and order enough material on the first truck ”” the delivery fee on a small top-up load often costs more than the stone itself.
For projects above 20 tons, most quarries quote a per-ton rate that drops by $2”“$5 once the order crosses 25 or 50 tons. Splitting a job into multiple small deliveries usually costs more in fuel surcharges than ordering a single tandem load. If access is tight, ask the dispatcher about side-dump or live-bottom trucks, which spread material as they roll and reduce hand-spreading time.
Finally, check whether the quarry sells by weight or by volume. Most U.S. yards bill by short ton, but some smaller operations price by the loose cubic yard. The calculator reports both, so the same job is easy to spec either way and compare quotes apples to apples. If the quarry quotes a metric tonne while you ordered short tons, expect a 10% difference between paperwork and pile size.