Material Math Guide
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Gravel Calculator: Cubic Yards and Tons

Estimate gravel volume and optional supplier-basis weight for a rectangular area.

Enter project dimensions plus the density quoted for the exact gravel product.

Measure the rectangular project length in feet.

Measure the rectangular project width in feet.

Enter the planned finished material depth.

Choose the unit used for the entered material depth.

Enter an allowance appropriate to the site and material.

Enter the tons per cubic yard supplied for the exact material.

Estimate boundary

What this result covers

  • Does not design drainage, base preparation, compaction, slope, or load capacity.
  • Use the result as a purchasing estimate and verify product instructions, site conditions, and local requirements before work begins.

How the calculation works

Formula

length × width × depth × (1 + waste percentage), with weight based on entered supplier density

Assumptions used

  • Depth is converted to feet before volume is calculated; one cubic yard equals 27 cubic feet.
  • The entered density uses US tons per cubic yard and must come from the supplier for the exact material.

Worked calculation breakdown

  1. Convert 3 in to feet: 3 ÷ 12 = 0.25 ft.
  2. Find the rectangular volume: 20 ft × 10 ft × 0.25 ft = 50 ft³.
  3. Apply 10% waste: 50 ft³ × 1.10 = 55 ft³.
  4. Convert to cubic yards: 55 ft³ ÷ 27 = 2.037 yd³, shown as 3 yd³ after purchase rounding.
  5. Apply the entered supplier density without rounding the volume first: 2.037 yd³ × 1.4 US tons/yd³ = 2.85 US tons.

The tool keeps user-entered product values separate from the geometry, then rounds the recommended purchasing quantity up where the material is bought as a whole unit.

Worked example

Project inputs
20 ft × 10 ft × 3 in, 10% waste, supplier density 1.4 tons/yd³
Purchase result
About 3 yd³ and 2.85 US tons before supplier rounding.

Enter these values in the calculator to reproduce the estimate. The purchase result uses the same tested calculation logic as the live tool.

Purchasing checklist

  1. Confirm compacted depth.
  2. Ask the supplier for density and selling unit.
  3. Confirm delivery minimums.

Common mistakes

  • Using a generic density.
  • Confusing compacted and loose depth.
  • Mixing short tons and metric tonnes.

Sources and methodology

These references support the product values, units, or planning boundaries shown on this page. Always confirm the current instructions for the exact material you buy.

  1. NIST — NIST Handbook 130 (2026)Checked 2026-07-30

    Handbook 130 (2026), Method of Sale §2.29, p. 135: bulk aggregate/gravel must be sold by cubic meter, cubic yard, or weight; it sets no universal tons-per-yard value.

  2. NIST — Handbook 133 (2026), Appendix E: General Tables of Units of MeasurementChecked 2026-07-27

    The tables give 1 square foot as 144 square inches, 1 cubic foot as 1,728 cubic inches, and 1 cubic yard as 27 cubic feet.