Bags of Pea Gravel for a 4x100 Walkway

How many bags of pea gravel for a 4x100 walkway: at 3 inches deep you need about 100.0 cubic feet, which is 200 bags of the common 0.5 cubic foot size. If your store sells pea gravel in 50-pound bags instead, figure about 208 bags, since pea gravel weighs roughly 104 pounds per cubic foot.

Volume and tonnage calculator →

Bag count by depth

Depth	Cubic feet	0.5 cu ft bags	50 lb bags (approx.)
1 in	33.3	67	70
2 in	66.7	134	139
3 in	100.0	200	208
4 in	133.3	267	277

How to figure it

Area: 4 × 100 = 400 sq ft.
Volume: 400 × (3 ÷ 12) = 100.0 cu ft.
Bags: 100.0 ÷ 0.5 = 200 bags (round up).

Bags or bulk?

A cubic yard is 27 cubic feet, so 100.0 cubic feet is 3.70 yards, about 5.2 tons. At this size, a bulk delivery usually beats a cart full of bags once you count trips. Compare the bag price × 200 against a bulk quote for 5.7 tons delivered.

About pea gravel

Because pea gravel is round, it never fully locks. Keep depths modest on walkways and patios so it does not feel like walking on a beach, and use edging.

Laying it down for a walkway

Dig and level. Remove sod and set the base slightly below the surrounding grade.
Edge it. Steel, plastic or stone edging keeps material in place.
Spread in layers. Rake to depth, then rake smooth; rounded stone will not compact.
Buy a few extra. Grab 5 to 10 percent more bags for settling and touch-ups.

The volume and tonnage calculator handles other sizes and depths.

When to choose pea gravel

Good uses:

Patios, walkways and dog runs
Play areas with proper depth and edging
Drainage around foundations when sized properly

Think twice for:

Driveways and steep paths, where it rolls and ruts
Under pavers as a base
Areas without edging

Quick reference numbers

Per inch over 100 sq ft: about 0.43 tons of pea gravel (0.31 cubic yards).
Per inch over 1,000 sq ft: about 4.3 tons.
Another size for comparison: a 20x25 area at 4 inches takes about 8.6 tons.
Weight used here: about 1.4 tons per cubic yard.

Common estimating mistakes

Mixing up cubic yards and tons. Yards are volume, tons are weight; convert with the product’s weight per yard.
Ordering exactly the math. Uneven ground and spillage nearly always need a little more than the flat calculation.
Ignoring the base. A thin surface layer over soft soil fails early no matter how much material is on top.
Forgetting that compaction shrinks loose material. A loose 4-inch spread of a dense-graded stone may finish closer to 3 inches after rolling.

Questions people ask

How many bags of pea gravel for a 4x100 walkway?

About 200 bags of 0.5 cubic feet at 3 inches deep.

How many 50 lb bags of pea gravel for 4x100?

About 208 bags at 3 inches.

How many 0.5 cubic foot bags are in a cubic yard?

54 bags.

How many cubic feet is a 4x100 walkway at 3 inches?

About 100.0 cubic feet.

When does bulk make more sense?

Usually once the job passes about a cubic yard, or when you would need more than a few car trips.

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