Pea gravel vs crushed stone: differences and buying guide

What is the difference between pea gravel and crushed stone?

Pea gravel has small, rounded stones; crushed stone has angular, broken faces from crushing. Shape is an important difference, but it does not establish a product’s grading, density or suitability for a particular layer. Ask for the exact specification before substituting one for the other.

Sakrete Canada describes its pea gravel as a natural, rounded 10 mm (3/8 in) stone. Indiana DOT’s aggregate technician manual distinguishes angular crushed particles from rounded natural gravel. Those references explain the shape comparison; the size of your supplier’s product still needs checking.

Compare the job, not just the appearance

Describe the use: a decorative bed, a walking surface, a drainage layer, or a vehicle-bearing build-up. Ask whether the quoted product is suitable for that use and what preparation, edging and maintenance it requires. Do not assume a gravel labelled “all-purpose” is approved for every structural situation.

Sakrete’s technical sheet lists applications for its particular all-purpose gravel. Those are manufacturer statements about that product, not proof that every product sold under a similar name performs the same way. Likewise, Vulcan’s estimator distinguishes geology and product categories rather than assuming a single weight for all aggregates.

Separate the quantity question

If two proposed products both cover 100 ft² at a specified 2 in thickness, each needs 16.6667 ft³ before extras. Their estimated weights can differ because density differs. The volume calculation does not decide which material is suitable.

For an illustrative comparison, 0.5 m³ at 1,500 kg/m³ weighs 750 kg; at 1,700 kg/m³ it weighs 850 kg. Those values demonstrate the calculation only. They are not certified densities for pea gravel or crushed stone.

A supplier conversation checklist

• What exact product and particle-size specification does this quote cover?
• Is it intended for the planned use and layer position?
• Is the stated depth loose or compacted?
• What bulk density should I use for ordering by weight?
• Does the bag label give mass, volume yield, or both?
• What delivery minimum, purchase increment and access conditions apply?

Record the answers in separate layers in the gravel calculator. For a decorative pea gravel quote, the pea gravel worksheet keeps bag quantities and supplier density editable. For a driveway with a designed base and surface, use the layered driveway tool.

The calculator can compare quantities and prices once a product is selected. It cannot validate a substitution or certify a driveway design.