Quick answer
Cubic yards of gravel for an area. Enter length, width and depth / thickness and the gravel calculator returns cubic yards, cubic feet and cubic metres.
Related tools: Concrete Calculator: Cubic yards of concrete for a slab, plus bag counts. Mulch Calculator: Cubic yards of mulch for a bed. Cubic Yards Calculator: Cubic yards, cubic feet and cubic meters from length, width and height.
How to use the Gravel Calculator
- Enter length (ft) (above 0).
- Enter width (ft) (above 0).
- Enter depth / thickness (in) (above 0).
- Optionally, enter waste allowance (%) (between 0 and 50). It starts at 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 / thickness | A number, in in | > 0 |
| Waste allowance (optional) | A number, in % | ≥ 0, ≤ 50, starts at 0 |
Formula and method
Formula
cubic yards = length (ft) × width (ft) × depth (in ÷ 12) ÷ 27
IEEE-754 double precision; shown to at most 6 decimal places.
27 ft³ = 1 yd³. A waste allowance is added to the total.
Worked examples
These examples are verified: each one is an automated test case that the live calculator must reproduce exactly.
Example 1
Inputs: Length = 10; Width = 10; Depth / thickness = 4.
| Result | Value |
|---|---|
| Cubic yards | 1.2346 yd³ |
| Cubic feet | 33.3333 |
| Cubic metres | 0.9439 |
Example 2
Inputs: Length = 10; Width = 10; Depth / thickness = 4; Waste allowance = 10.
| Result | Value |
|---|---|
| Cubic yards | 1.358 yd³ |
| Cubic feet | 36.6667 |
| Cubic metres | 1.0383 |
The first line is the headline result (cubic yards). Below it the gravel Calculator lists cubic feet and cubic metres, which describe the same case from other angles. IEEE-754 double precision; shown to at most 6 decimal places.
Planning gravel depth
Contractor guidance for residential driveways often quotes a compacted base of roughly 4 to 6 inches, with more for heavy vehicles or soft ground, plus a thinner surface layer on top. These are common rules of thumb rather than a code requirement; follow your local standard or an engineer for anything structural.
Depth should be the finished compacted thickness. Loose stone compacts, so the volume you order is larger than length × width × finished depth. Use the waste allowance to cover that.
Gravel for a 40 ft × 12 ft driveway at different depths
Every figure in this table comes from running this calculator, so it matches what the form returns.
| Depth (inches) | Cubic yards | Cubic feet |
|---|---|---|
| 2 | 2.963 | 80 |
| 4 | 5.9259 | 160 |
| 6 | 8.8889 | 240 |
What happens with invalid input
These messages are produced by the calculator itself, so you know what to fix.
- Depth / thickness: entering "0" shows "Depth / thickness must be greater than 0." beside that field and no result.
Choosing between the Gravel 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 |
|---|---|---|
| [Concrete Calculator](/construction/concrete-calculator/) | length, width and depth / thickness | Cubic yards |
| [Mulch Calculator](/construction/mulch-calculator/) | length, width and depth / thickness | Cubic yards |
| [Cubic Yards Calculator](/construction/cubic-yards-calculator/) | length, width and height or depth | Volume |
| [Sand Calculator](/construction/sand-calculator/) | length, width and depth / thickness | Cubic yards |
| [Soil Calculator](/construction/soil-calculator/) | length, width and depth / thickness | Cubic yards |
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
- Rectangular volume only
- Round up when ordering
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 depth / thickness to confirm this.
Frequently asked questions
What does the Gravel Calculator calculate?
Cubic yards of gravel for an area. It returns Cubic yards, Cubic feet and Cubic metres.
What formula does the Gravel Calculator use?
cubic yards = length (ft) × width (ft) × depth (in ÷ 12) ÷ 27. 27 ft³ = 1 yd³.
What do I need to enter in the gravel Calculator?
You enter Length (ft), Width (ft) and Depth / thickness (in). Optional: Waste allowance (%).
How is the result rounded or limited?
IEEE-754 double precision; shown to at most 6 decimal places. Rectangular volume only.
What are the limits of this calculator?
Rectangular volume only. Round up when ordering.
What is an example of a gravel result?
With length 10, width 10 and depth / thickness 4, the cubic yards is 1.2346 yd³.
Where does the method come from?
The method follows: Manufacturer yield figures for 60 lb and 80 lb pre-mixed concrete bags (Quikrete product data).
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: Rectangular volume only.
Related calculators
- Concrete Calculator — Cubic yards of concrete for a slab, plus bag counts.
- Mulch Calculator — Cubic yards of mulch for a bed.
- Cubic Yards Calculator — Cubic yards, cubic feet and cubic meters from length, width and height.
- Sand Calculator — Cubic yards of sand for an area.
- Soil Calculator — Cubic yards of soil for an area.
- Gravel Volume Calculator — Cubic yards (and tons, if you know the material weight) of gravel, sand, soil or mulch to fill an area.
- Square Footage Calculator — Area of a rectangular space in square feet, square metres and square yards.
- Paint Calculator — Gallons of paint for the walls of a room.
- Lumber Weight Calculator — Weight of boards or beams from species, actual dimensions and quantity (air-dried, 12% moisture).
Sources
- Manufacturer yield figures for 60 lb and 80 lb pre-mixed concrete bags (Quikrete product data)
Content last reviewed 2026-11-04. Formulas and worked examples are checked by automated tests against independently computed values.