Bag label → ground coverage
A cubic foot is a volume, not an area
A half-cubic-foot bag covers 3 square feet at 2 inches or 2 square feet at 3 inches. Spread it thinner and the footprint grows; spread it deeper and the footprint shrinks. The coverage assumes a level layer and uses no extra allowance.
NorthRock's pea gravel product sheet lists a ½ ft³ bag at up to 3 sq ft at 2 inches, which matches the geometry.
Coverage by bag size and depth
Use this table when reading a store label or checking a carton quantity. Each cell is the ideal square feet covered by one bag; project orders still need whole bags.
| Pea gravel depth | 0.5 ft³ bag | 0.6 ft³ bag |
|---|---|---|
| 1.5 in | 4.0 sq ft | 4.8 sq ft |
| 2 in | 3.0 sq ft | 3.6 sq ft |
| 2.5 in | 2.4 sq ft | 2.9 sq ft |
| 3 in | 2.0 sq ft | 2.4 sq ft |
The second column matches common half-cubic-foot listings, including this Lowe's pea gravel listing. A Sakrete technical sheet gives approximately 0.6 ft³ for one of its 50 lb bags. Read the product in your hand; pounds alone are not a reliable bag-size input.
Worked order
Calculate volume, add extra, then round once
Net ft³ = area (sq ft) × depth (in) ÷ 12Planned ft³ = net ft³ × (1 + extra % ÷ 100)Bags = round up (planned ft³ ÷ labeled ft³ per bag)For a 12 × 12 ft space at 2 inches, the surface requires 144 × 2 ÷ 12 = 24 ft³. A chosen 10% extra makes that 26.4 ft³. With a bag labeled 0.5 ft³, 26.4 ÷ 0.5 = 52.8, so buy 53 whole bags. Without extra, the same space needs 48 bags.
For a curved bed, divide it into measured sections or use its known square footage in the calculator. If the subgrade has low spots, measure the extra fill separately; a flat-area formula cannot discover them. The pea gravel coverage calculator solves the reverse question when you already know the quantity on hand.
Bagged or delivered loose?
Compare the full local quotes
There is no universal bag count where bulk becomes cheaper. Bag prices, pallet discounts, a supplier's minimum order and delivery distance change the answer. Enter your local bag price, any bag pickup or delivery costs and a delivered bulk quote for at least the planned volume to compare like for like.
As a hypothetical example, 53 bags at $5.75 each cost $304.75 before sales tax and transport. A $240 delivered loose quote for the same volume would be $64.75 less before any taxes or bag transport costs. Bags may still help when access is narrow or the job is spread across several small beds. The bulk versus bagged guide covers handling and delivery tradeoffs; the pea gravel cubic yard calculator converts larger orders.
Pea gravel bag questions
How many half-cubic-foot bags cover 100 square feet?
At 2 inches deep, 100 square feet needs 16.67 cubic feet, so round 33.33 up to 34 bags labeled 0.5 cubic foot. With a 10% extra allowance, multiply the volume before rounding: 16.67 × 1.10 ÷ 0.5 = 36.67, or 37 bags. At 3 inches with no extra, it takes 50 bags.
How many 0.5 cubic foot bags make one cubic yard?
Exactly 54 by volume: 1 cubic yard is 27 cubic feet, and 27 ÷ 0.5 = 54. This is a volume conversion, before any extra allowance or rounding for a particular project.
Can I treat every 50-pound bag as half a cubic foot?
No. Use the volume stated on the bag to calculate coverage. A 50-pound bag may yield a different volume depending on its product and aggregate; for example, Sakrete lists approximately 0.6 cubic foot for its 50-pound pea gravel bag. Bag weight is useful for estimating the load you will carry.
How much will my pea gravel bag order weigh?
Multiply the rounded bag count by the weight printed on your bag. For the example of 53 bags, a product labeled 50 pounds per bag gives 2,650 pounds of bagged product. Enter your actual bag weight in the calculator; leave it blank if the label does not provide one.
Is the 2-inch setting suitable under playground equipment?
No. The 2-inch example is for a decorative surface, not fall protection. Playground surfacing needs a separate design based on equipment fall height, impact performance, installed depth, containment, and maintenance. Consult the current CPSC playground handbook and the surface manufacturer.
For playground surfacing, consult the current CPSC Public Playground Safety Handbook; a decorative gravel depth is not a fall-protection specification.