What size is standard pea gravel?

3/8 inch is the default almost everywhere. When a landscape yard says pea gravel with no qualifier, that is what loads into your truck. It walks well, screeds flat for patios, and moves cleanly through spreaders and wheelbarrows — the all-purpose grade for paths, patios and fill.

Does pea gravel size change how much I need?

Not meaningfully. All grades from 1/4 to 5/8 inch run about 96 lb/ft³ loose — roughly 1.3 tons per cubic yard — so one ton covers about 125 ft² at 2 inches regardless of grade. Estimate by area and depth, not by stone size.

Which pea gravel size is best for walkways?

3/8 inch at 2 inches deep over a compacted base. Smaller 1/4 inch packs a little firmer but tracks into the house in shoe treads; 1/2 inch and up rolls more underfoot. Whatever the size, steel or aluminum edging is what keeps the path a path.

What size pea gravel for drainage?

Go larger — 1/2 to 5/8 inch. Bigger rounded stones leave bigger voids, so water moves faster and the surface resists clogging with sediment. For French-drain dressing and downspout splash zones, 1/2 inch is the workhorse; reserve 1/4 inch for cosmetic top layers.

Is 5/8 inch still pea gravel?

It is the top of the range — some yards call it large pea gravel or river pebble. Its advantage is inertia: heavier stones migrate less and stay put better in decorative beds. The trade-off is a coarser look and a less comfortable walking surface than 3/8 inch.

Can I mix pea gravel sizes?

You can, but blends pack tighter and drain slower than a single screened grade, and topping up later with a matching mix is nearly impossible. For picky work — bocce courts, exposed aggregate — buy one grade from one supplier in one load, and ask for the gradation sheet.

Gravel · Pea Gravel

Pea gravel sizes, decoded

Four grades span 1/4 to 5/8 inch. One of them is the right answer for almost every job — but the exceptions matter, and the sieve numbers tell you what you're actually buying.

Contents

1.The size grades at a glance
2.Why 3/8 inch dominates
3.Sieve sizes behind the names
4.Choosing a size: dog run example

The size grades at a glance

All grades weigh ≈96 lb/ft³ loose (≈1.3 tons/yd³), so coverage math is identical across sizes.
Size	Best use	Notes
1/4 in	Paver joint filler, bocce courts	Packs firmest of the range; tracks in shoe treadsSometimes sold as fine pea gravel
3/8 in	Paths, patios, aquariums — the standard	The default grade at nearly every yard
1/2 in	Dog runs, drainage, splash zones	Bigger voids drain faster and resist clogging
5/8 in	Decorative beds and borders	Heaviest stones — migrates least, stays put better

Size changes behavior, not quantity. Whatever grade you choose, one ton still covers about 125 ft² at 2 inches and 83 ft² at 3 inches — the full tables are in the coverage guide, and every grade still needs edging.

Why 3/8 inch dominates

3/8 inch wins on three practical counts. It walks well: stones are small enough to bed into each other underfoot instead of rolling like the larger grades. It screeds flat: a patio surface pulled with a board comes out even, because no single stone is tall enough to snag the screed. And it machine-handles: it flows through spreaders, drops cleanly from a skid-steer bucket, and shovels without bridging. Suppliers stock it deepest for the same reasons, which usually makes it the cheapest grade per ton. Unless the job specifically rewards a different size — drainage wants bigger, joint filler wants smaller — 3/8 is the answer.

Sieve sizes behind the names

Choosing a size: dog run example

Worked example

A 10 × 25 ft dog run for two large dogs. The tension: drainage (bigger is better) versus paw comfort (smaller is better).

1
Drainage requirement
Urine and rain must pass fast — rules out 1/4 in, which packs and holds odor
2
Paw comfort
5/8 in rolls under paws and lodges between pads — too coarse
3
The split decision
1/2 in balances both: open voids, still comfortable to trot on
4
Quantity at 4 in deep
250 ft² × (4 ÷ 12) = 83 ft³ ≈ 4 tons after 10% waste

Result: 1/2 inch pea gravel, 4 inches deep over a 2 inch compacted base — about 4 tons, hosed clean monthly.

Size questions

What size is standard pea gravel?: 3/8 inch is the default almost everywhere. When a landscape yard says pea gravel with no qualifier, that is what loads into your truck. It walks well, screeds flat for patios, and moves cleanly through spreaders and wheelbarrows — the all-purpose grade for paths, patios and fill.
Does pea gravel size change how much I need?: Not meaningfully. All grades from 1/4 to 5/8 inch run about 96 lb/ft³ loose — roughly 1.3 tons per cubic yard — so one ton covers about 125 ft² at 2 inches regardless of grade. Estimate by area and depth, not by stone size.
Which pea gravel size is best for walkways?: 3/8 inch at 2 inches deep over a compacted base. Smaller 1/4 inch packs a little firmer but tracks into the house in shoe treads; 1/2 inch and up rolls more underfoot. Whatever the size, steel or aluminum edging is what keeps the path a path.
What size pea gravel for drainage?: Go larger — 1/2 to 5/8 inch. Bigger rounded stones leave bigger voids, so water moves faster and the surface resists clogging with sediment. For French-drain dressing and downspout splash zones, 1/2 inch is the workhorse; reserve 1/4 inch for cosmetic top layers.
Is 5/8 inch still pea gravel?: It is the top of the range — some yards call it large pea gravel or river pebble. Its advantage is inertia: heavier stones migrate less and stay put better in decorative beds. The trade-off is a coarser look and a less comfortable walking surface than 3/8 inch.
Can I mix pea gravel sizes?: You can, but blends pack tighter and drain slower than a single screened grade, and topping up later with a matching mix is nearly impossible. For picky work — bocce courts, exposed aggregate — buy one grade from one supplier in one load, and ask for the gradation sheet.

Size chosen — now get the tonnage

The pea gravel calculator turns your dimensions into tons, yards and bag counts.

Open the Pea Gravel Calculator

Keep reading

What Is Pea Gravel?Pea Gravel Coverage Gravel Size Chart

Sources & references

[1]ASTM D448: Standard Classification for Sizes of Aggregate — ASTM International, 2017
[2]AASHTO M 43: Sizes of Aggregate for Road and Bridge Construction — AASHTO, 2018