Gravel Calculator
The calculator first finds compact geometric volume, then applies your extra-material percentage and selected bulk density. Supplier gradation and moisture can change actual weight.
How to use this calculator
Enter the covered dimensions and installed depth.
Confirm or replace the material density with your supplier value.
Set an allowance and compare the resulting volume and weight with supplier units.
Formula
Order volume = area × depth × (1 + allowance). Weight = order volume × bulk density.
Worked example
A 20 ft × 10 ft area at 3 in deep is 50 ft³. With 10% extra it is 55 ft³, or about 2.037 yd³, before multiplying by density.
Assumptions and limits
- Default density is 2,225 kg/m³ (about 138.9 lb/ft³), the FHWA planning value for aggregate base, and remains user-editable. Loose decorative gravel may be substantially lighter.
- Allowance applies once after all geometric volumes are summed.
- The result is an estimate; compaction, moisture, and gradation vary.
Sources
- National Institute of Standards and Technology: Unit ConversionExact unit conversion and final-result rounding guidance. Reviewed 2026-08-14.
- Federal Highway Administration: Estimating TablesReference material densities used for planning estimates. Reviewed 2026-08-13.
Related calculators
Verification
How this calculator is checked
Trust comes from reproducible evidence, not model confidence. You can inspect the formula, assumptions, worked example, and cited sources on this page.
- Versioned calculationFormula logic is kept separate from the interface and covered by automated registry and behavior checks.
- Cited evidenceSources linked for independent checking: 2.
- Transparent AI useAI may assist drafting or adversarial review. Agreement between models is not proof, and no human expert review is claimed unless a named reviewer is shown.
Frequently asked questions
Should I use the default gravel density?
Use a supplier-provided loose or compacted density whenever available because gravel type, particle size, and moisture affect weight.
Can I use metric and US customary units in the Gravel Calculator?
Yes. Unit changes convert the same canonical measurement; they do not reinterpret or round your original value.
When does the calculator round?
The calculation keeps full precision internally and rounds only the displayed result. Whole packages are rounded up at the final step.
Last updated 2026-08-25 · 1.0.0 · 1.0.0 · Published by YunFanLabs