Yard & garden tool
Gravel & Landscape Stone Calculator
Measure rectangular, circular, and triangular areas to estimate gravel or decorative stone volume. Add supplier bulk density only when you also need an estimated weight.
Planning mulch, soil, or compost without weight? Use the Yard Material Planner.
Plan a purchase
Use actual package capacities or supplier ordering increments.
Purchase by volume
Purchase by estimated weight
Prices use the currency you enter. Delivery, taxes, minimum-order fees, site access, and vehicle capacity are not included.
Weight is estimated from the supplier density you enter. Purchase counts use strict represented coverage without a shortage tolerance.
How to calculate gravel volume
Gravel starts with a volume calculation: area × depth = volume. Measure each non-overlapping section, choose the depth for your own project, calculate its volume, and then add the section volumes together.
For a rectangle, length × width = area. When length and width are in feet, multiply the square-foot area by the depth in feet to get cubic feet. Convert inches to feet before multiplying. To express the result in cubic yards, divide cubic feet by 27: cubic yards = cubic feet ÷ 27. One cubic yard is exactly 27 cubic feet.
The calculator supports rectangular, circular, and triangular sections. It does not trace arbitrary freehand shapes. Enter each section only once; overlapping sections should not be double-counted.
How to measure irregular landscape areas
For an irregular gravel path, border, or patio surround, divide the footprint into smaller rectangles, circles, or triangles that do not overlap. Measure each simple section, calculate its area, and add the results. Curves may need a practical approximation using the closest simple shapes.
This is a measuring approach, not a drawing tool or an automatic overlap check. For a fuller explanation of breaking a curved bed into measured sections, see the Garden Bed Measurement Guide; apply the same careful, non-overlapping process to the gravel footprint.
Cubic yards versus tons
Cubic feet, cubic yards, liters, and cubic meters measure volume. Kilograms, U.S. short tons, and metric tonnes measure mass. They answer different questions: volume describes the space material occupies, while mass describes how much material is in that space.
If a supplier sells gravel by weight, estimate mass with estimated mass = volume × bulk density. There is no universal conversion between cubic yards and tons for every gravel or stone product. A U.S. short ton and a metric tonne are also different units, so confirm the unit used by the supplier.
How to obtain and use supplier bulk density
Bulk density expresses the mass of material within a measured volume, including the spaces between particles. Ask the supplier for a figure for the actual product and for the relevant condition, such as loose or compacted material. This calculator accepts kilograms per cubic meter, pounds per cubic foot, U.S. short tons per cubic yard, and metric tonnes per cubic meter.
Stone type, particle size, packing, and moisture can affect a useful estimate. The public overview of ASTM C29/C29M-23 describes bulk density for aggregate in loose or compacted conditions and notes that moisture and stockpile or hauling conditions can differ from its dry-basis test method. It is context for asking better supplier questions, not a universal gravel-density table or a default for this calculator. ASTM C29/C29M-23 public overview
Worked gravel calculation
This hypothetical example illustrates the calculator’s method. It does not recommend a depth, buffer, density, or supplier increment for another project.
| Area | 20 ft × 10 ft = 200 ft2 |
|---|---|
| Selected depth | 3 in ÷ 12 = 0.25 ft |
| Raw volume | 200 ft2 × 0.25 ft = 50 ft3 |
| Raw cubic yards | 50 ÷ 27 ≈ 1.851852 yd3 |
| Optional 10% buffer | 50 ft3 × 0.10 = 5 ft3 |
| Buffered requirement | 50 + 5 = 55 ft3; 55 ÷ 27 ≈ 2.037037 yd3 |
| Optional supplier density | 1.4 U.S. short tons per yd3 |
| Estimated buffered mass | (55 ÷ 27) × 1.4 ≈ 2.851852 U.S. short tons |
The calculator would display rounded values for people, while retaining its represented calculation values for purchasing. The following purchase paths are separate scenarios; they are not quantities to buy together.
Bags by volume
With hypothetical 2-ft3 bags, 55 ÷ 2 = 27.5, so 28 bags are required. That purchases 56 ft3, leaving a theoretical 1 ft3.
Bulk by volume
With a hypothetical 1-yd3 supplier increment, 55 ÷ 27 ≈ 2.037037, so 3 increments are required. That purchases 3 yd3, or 81 ft3, leaving a theoretical 26 ft3.
Bulk by weight
With hypothetical 0.5-U.S.-short-ton increments, 2.851852 ÷ 0.5 ≈ 5.703704, so 6 increments are required. That purchases 3 U.S. short tons, about 0.148148 short tons above the estimate.
Buying gravel by bags, volume, or weight
Bagged products state a volume per bag. Bulk suppliers may sell by a volume increment, such as cubic yards or cubic meters, or by a mass increment. Enter the actual package capacity or increment supplied to you. The material requirement is the calculated volume or estimated weight; the purchased quantity is the whole number of supplier units needed to cover it; and the theoretical leftover is the difference.
If you enter a price, the calculator shows only a material-only estimate in the currency you entered. Taxes, delivery, supplier minimums, handling, site access, and other charges are outside the calculation. A lower material-only amount does not necessarily make one purchasing method the better overall choice.
Common calculation mistakes
- Multiplying square feet by inches without first converting the depth to feet.
- Mixing cubic feet and cubic yards instead of dividing or multiplying by 27 where appropriate.
- Treating U.S. short tons and metric tonnes as the same unit.
- Guessing density rather than confirming a supplier figure for the product and condition.
- Double-counting overlapping areas or applying the same buffer twice.
- Confusing the raw material requirement with the larger whole supplier increment that must be purchased.
- Using a compacted-material figure for an unrelated loose-volume estimate.
- Treating rounded display values as exact ordering quantities.
Assumptions and limitations
You choose the measurements, depth, optional buffer, and optional supplier density. This tool estimates geometric volume and optional weight; it does not determine a suitable installation depth, density, compaction factor, structural section, drainage design, vehicle load, or engineered driveway specification.
Decorative gravel and engineered base-layer applications are different project decisions. Loose versus compacted material can change real purchasing needs, and the optional buffer is not a substitute for determining project-specific compaction. Actual supplier-delivered quantities and site conditions can differ from an estimate.
Sources
- NIST Guide to the SI, Appendix B.9: Factors for units listed by kind of quantity or field of science — volume and mass-density conversion context.
- NIST Guide to the SI, Appendix B.8: Factors for units listed alphabetically — additional conversion reference.
- ASTM C29/C29M-23 public overview: Bulk Density (“Unit Weight”) and Voids in Aggregate — public scope and context for loose or compacted aggregate bulk density, voids, and moisture limitations.