Material distinction
Rounded gravel and crushed aggregate behave differently
| Planning question | Pea gravel | Crushed stone |
|---|---|---|
| Typical particle shape | Rounded or naturally worn | Angular faces produced by crushing |
| Movement | Remains relatively loose and can migrate without containment | Well-graded products can interlock when properly compacted |
| Specification | Size, cleanliness and source still vary | Gradation and fines vary by named product and producer |
| Quantity input | Area × selected finished depth | Area × selected finished depth, with compaction handled only when specified |
Choose by function
Start with the project requirement, not the material name
Ask whether the layer must remain decorative and loose, drain freely, provide a compacted base, support traffic, or meet a written gradation. “Pea gravel” and “crushed stone” are broad market terms; the supplier's product description and the project specification control.
Do not replace a specified compactable aggregate with rounded gravel—or the reverse—based only on this comparison. Base, drainage and load-bearing suitability require the actual design and material data.
Quantity comparison
The same volume can produce different weight estimates
Both materials begin with the same geometry, but their bulk densities can differ because particle shape, grading, voids and moisture differ. Use the dedicated pea-gravel profile for a first estimate and a supplier density for haul or weight-priced orders.
Sources
References and project authority
These references support the stated measurement convention or planning boundary. Product instructions, the approved design, and local requirements take priority for the actual project.
- USGS Mineral Commodity Summaries: Construction Sand and Gravel describes naturally occurring sand-and-gravel materials and markets.
- USGS Mineral Commodity Summaries: Crushed Stone separately documents stone produced by crushing quarried rock.