Length × width × depth in feet gives cubic feet; divide by 27 for cubic yards, and multiply cubic yards by 0.765 for cubic meters. A 10 × 10 ft area at 4 inches deep is 33.3 cubic feet — 1.23 cubic yards, about 0.94 cubic meters, and roughly 1.9 tons of crushed stone.
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Stone Volume Calculator Guide
Stone estimating is volume math wearing work boots. Suppliers, engineers, and DIY guides each favor a different unit — cubic yards at the quarry, cubic meters on imported spec sheets, cubic feet in bagged-goods aisles — and every unit error multiplies straight into wasted dollars. This calculator computes the volume of your project once and reports it in all three systems, then applies density to give tonnage.
The underlying arithmetic is one line: length × width × depth, all in the same unit. Every conversion headache in this trade comes from mixing units inside that line — feet for the footprint, inches for the depth — and the fix is mechanical: divide inches by 12 before they touch the formula.
How Do Cubic Feet, Yards, and Meters Relate?
Three volume units, one set of ratios — plus what each holds in crushed stone at 1.5 tons per cubic yard:
| Unit | Cubic feet | Cubic yards | Cubic meters | Crushed stone weight |
|---|---|---|---|---|
| 1 cubic foot | 1 | 0.037 | 0.028 | about 111 lb |
| 1 cubic yard | 27 | 1 | 0.765 | 1.5 tons |
| 1 cubic meter | 35.3 | 1.31 | 1 | about 1.96 tons |
Two anchors cover most field situations: a cubic meter is roughly a third bigger than a cubic yard, and a single cubic foot of crushed stone — about a five-gallon-bucket-and-a-half — already weighs 111 lb. That second fact explains why bagged stone never makes economic sense beyond the smallest patch jobs.
Worked Example: From Tape Measure to Order
A 22 × 14 ft parking pad at 4 inches: convert depth first (4 ÷ 12 = 0.333 ft), then multiply — 22 × 14 × 0.333 = 102.7 cubic feet. Divide by 27 for 3.8 cubic yards, or multiply by 0.0283 if a spec sheet wants 2.9 cubic meters. At 1.5 tons per yard, the order is about 5.7 tons of crushed stone before any waste allowance.
Run the sanity check backwards before ordering: 3.8 yards should cover 102.7 ÷ (4/12) ≈ 308 square feet, and 22 × 14 is 308. When the coverage check closes the loop like that, the volume is trustworthy — most twelvefold inch errors and doubled dimensions die at this step.
Volume is the universal middle step; weight is what the scale ticket shows. The cubic yards to tons calculator handles the volume-to-weight direction for every material density, and the tons to cubic yards calculator reverses it when the quote arrives in tons first.
Frequently Asked Questions
How many cubic feet are in a cubic yard of stone?
Exactly 27 — a yard is 3 feet, so a cubic yard is 3 × 3 × 3 feet. Divide any cubic-foot figure by 27 to get cubic yards; the material never changes that ratio.
How do cubic meters compare to cubic yards?
One cubic meter equals about 1.31 cubic yards or 35.3 cubic feet, and one cubic yard is about 0.765 cubic meters. Spec sheets from engineering firms often use cubic meters while US suppliers quote yards, so the conversion comes up constantly.
How do I convert stone volume to weight?
Multiply cubic yards by the material density in tons per cubic yard: about 1.5 for crushed stone, 1.4 for gravel, 1.55 for crusher run, and up to 1.65 for riprap. The same volume of different stone can differ by half a ton per yard.
What is the most common volume-math mistake?
Forgetting to convert depth from inches to feet. A 4-inch depth must enter the formula as 0.333 feet — using 4 directly inflates the answer twelvefold, which is why sanity-checking against roughly 1.5 tons per 10 × 10 ft at 4 inches is worth doing.