Quick answer
Gravel volume (ft³) = length × width × depth ÷ 12 × (1 + waste), and tons = cubic yards × weight per yard ÷ 2,000. A 20 × 10 ft area 3 inches deep is 50 ft³ or 1.85 yd³, which at 2,700 lb per yard is 2.5 tons.
Enter length, width, depth, waste and optionally the material weight. The calculator returns volume and weight.
Related tools: Gravel Calculator: Cubic yards of gravel for an area. Retaining Wall Calculator: Blocks for a segmental retaining wall. Sod Calculator: Pieces of sod for a lawn.
How to use the Gravel Volume Calculator
- Enter length (ft) (above 0).
- Enter width (ft) (above 0).
- Enter depth (in) (above 0).
- Enter waste allowance (%) (between 0 and 100). It starts at 0.
- Optionally, enter material weight (optional) (lb per yd³) (above 0).
- Press Calculate to see the result, and use Reset to start again.
| Input | What to enter | Allowed values |
|---|---|---|
| Length | A number, in ft | > 0 |
| Width | A number, in ft | > 0 |
| Depth | A number, in in | > 0 |
| Waste allowance | A number, in % | ≥ 0, ≤ 100, starts at 0 |
| Material weight (optional) (optional) | A number, in lb per yd³ | > 0 |
Formula and method
Formula
volume (ft³) = length × width × depth ÷ 12 × (1 + waste); tons = yd³ × weight per yd³ ÷ 2,000
IEEE-754 double precision; shown to the decimals indicated.
Material weights vary with type and moisture, so enter the figure from your supplier to get tons. Plan geometry only; confirm quantities with your supplier and local code before ordering.
Worked examples
These examples are verified: each one is an automated test case that the live calculator must reproduce exactly.
Example 1
Inputs: Length = 20; Width = 10; Depth = 3; Waste allowance = 0; Material weight (optional) = 2700.
| Result | Value |
|---|---|
| Material needed | 1.85 yd³ |
| Cubic feet | 50 |
| Cubic meters | 1.416 |
| Weight (US tons) | 2.5 |
Example 2
Inputs: Length = 30; Width = 12; Depth = 4; Waste allowance = 10.
| Result | Value |
|---|---|
| Material needed | 4.89 yd³ |
| Cubic feet | 132 |
| Cubic meters | 3.738 |
| Weight (US tons) | — |
Example 3
Inputs: Length = 15; Width = 8; Depth = 2; Waste allowance = 5; Material weight (optional) = 2400.
| Result | Value |
|---|---|
| Material needed | 0.78 yd³ |
| Cubic feet | 21 |
| Cubic meters | 0.595 |
| Weight (US tons) | 0.93 |
The first line is the headline result (material needed). Below it the gravel Volume Calculator lists cubic feet, cubic meters and weight (US tons), which describe the same case from other angles. IEEE-754 double precision; shown to the decimals indicated.
Volume and weight
Suppliers sell gravel by the ton or the cubic yard. 1.85 yd³ × 2,700 lb = 5,000 lb = 2.5 tons. Material weights range from about 2,200 to 3,000 lb per yard depending on stone and moisture.
Compaction
Compacted gravel settles, so add 10 to 20% for a driveway base. A 3 inch layer is typical for paths, 4 to 6 inches for driveways.
How the result changes with length
Holding every other input at the first worked example, this table changes only length. It shows how sensitive the answer is to that one value; each row was produced by running this calculator.
| Length | Material needed | Cubic feet | Cubic meters |
|---|---|---|---|
| 10 | 0.93 yd³ | 25 | 0.708 |
| 20 | 1.85 yd³ | 50 | 1.416 |
| 40 | 3.7 yd³ | 100 | 2.832 |
| 80 | 7.41 yd³ | 200 | 5.663 |
What happens with invalid input
These messages are produced by the calculator itself, so you know what to fix.
- Length: entering "0" shows "Length must be greater than 0." beside that field and no result.
- Material weight (optional): entering "-5" shows "Material weight (optional) must be greater than 0." beside that field and no result.
Choosing between the Gravel Volume Calculator and similar calculators
Each row shows what a related calculator on this site asks for and what it returns, so you can pick the one that matches your question.
| Calculator | You enter | It returns |
|---|---|---|
| [Gravel Calculator](/construction/gravel-calculator/) | length, width and depth / thickness | Cubic yards |
| [Retaining Wall Calculator](/construction/retaining-wall-calculator/) | wall length, wall height and block length | Blocks needed |
| [Sod Calculator](/construction/sod-calculator/) | area to cover, area of one piece or roll and waste allowance | Pieces needed |
| [Lawn Mowing Time Calculator](/construction/lawn-mowing-calculator/) | lawn area, cutting width and walking speed | Mowing time |
| [Grass Seed Calculator](/construction/grass-seed-calculator/) | area to seed and seeding rate | Seed needed |
Background: construction estimates
Material quantities are geometry plus a margin. Calculate the exact volume or area, add an allowance for waste, spillage, cuts and uneven ground (calculator pages commonly mention 5 to 10 percent, a rule of thumb that varies by material and job) and round up to whole units. One cubic yard is exactly 27 cubic feet.
Suppliers often have minimum order sizes and may charge for small loads, so confirm quantities, product yields and local code with your supplier or a qualified estimator before ordering.
Assumptions and limitations
- Compacted material needs extra volume
Quantities are estimates. Add allowances for waste and site conditions, and follow local codes and a qualified professional's instructions for structural or safety-critical work.
If a required value is empty, not a number, or outside its allowed range, the form marks that field with a message and shows no result instead of a misleading number. The automated checks deliberately try invalid entries for length and material weight (optional) to confirm this.
Frequently asked questions
How many yards cover 100 ft² at 2 inches?
About 0.62 cubic yards cover 100 ft² at 2 inches deep.
Is gravel measured by ton or yard?
Either; ask the supplier.
Do I need landscape fabric?
Often recommended under gravel.
What does the Gravel Volume Calculator calculate?
Cubic yards (and tons, if you know the material weight) of gravel, sand, soil or mulch to fill an area. It returns Material needed, Cubic feet, Cubic meters and Weight (US tons).
What formula does the Gravel Volume Calculator use?
volume (ft³) = length × width × depth ÷ 12 × (1 + waste); tons = yd³ × weight per yd³ ÷ 2,000. Material weights vary with type and moisture, so enter the figure from your supplier to get tons.
What do I need to enter in the gravel Volume Calculator?
You enter Length (ft), Width (ft), Depth (in) and Waste allowance (%). Optional: Material weight (optional) (lb per yd³).
How is the result rounded or limited?
IEEE-754 double precision; shown to the decimals indicated. Compacted material needs extra volume.
What is an example of a gravel Volume result?
With length 20, width 10, depth 3, waste allowance 0 and material weight (optional) 2700, the material needed is 1.85 yd³.
Can I rely on this calculator for a decision?
Quantities are estimates. Add allowances for waste and site conditions, and follow local codes and a qualified professional's instructions for structural or safety-critical work. For this calculator in particular: Compacted material needs extra volume.
Related calculators
- Gravel Calculator — Cubic yards of gravel for an area.
- Retaining Wall Calculator — Blocks for a segmental retaining wall.
- Sod Calculator — Pieces of sod for a lawn.
- Lawn Mowing Time Calculator — Time to mow a lawn from its area, mower width and walking speed.
- Grass Seed Calculator — Pounds of seed for a lawn at your seeding rate.
- Polymeric Sand Calculator — Bags of polymeric sand for paver joints.
Sources
- OpenStax, Prealgebra 2e (Rice University): perimeter, area, volume, circumference and the Pythagorean theorem
- NIST Special Publication 811, Guide for the Use of the International System of Units (SI), Appendix B conversion factors (international foot 0.3048 m, inch 25.4 mm, US gallon 3.785411784 L)
Content last reviewed 2026-11-04. Formulas and worked examples are checked by automated tests against independently computed values.