From gravel dimensions to an order
Measure the length and width of the area and the required depth. For irregular paths, break the project into rectangles. Depth is converted from inches to feet before multiplying, so a 3-inch layer is 0.25 ft deep.
Adjusted volume = volume × (1 + allowance ÷ 100)
Cubic yards = adjusted volume ÷ 27
US short tons = adjusted volume × density (lb/ft³) ÷ 2,000
The bag count is rounded up using the volume on the bag. Bulk volume or weight is rounded up to 0.1 yd³ or 0.1 US short ton, according to the selected pricing basis. This is an estimating increment; your supplier may sell only whole tons or require a larger minimum.
Worked example: a 20 × 10 ft path
At 3 inches deep, the net volume is 50 ft³. With 10% extra, plan for 55 ft³, or about 2.04 yd³. At the example density of 100 lb/ft³, that weighs 5,500 lb (2.75 US short tons). Order an estimated 2.8 short tons, or 2.1 yd³ when buying by volume. The bag alternative is 110 bags of 0.5 ft³.
At an example price of $50 per short ton, the 2.8-ton material estimate is $140. At $5 per bag, 110 bags cost $550. These example prices do not represent a local quote; delivery and tax are additional.
Bulk delivery or bags?
This tool suggests comparing bulk delivery at 1 yd³ or 40 bags and above. Below that, bags can be convenient for carrying into small or difficult-to-access spaces. These are practical comparison thresholds, not supplier rules. Get a delivered quote before deciding; check access, minimum loads and where the pile will be placed.
Weight is only as accurate as the entered loose bulk density. Stone size, material, moisture and voids all affect it. This calculator does not predict compaction. For a compacted base, ask the supplier how much loose material and which depth allowance to order.
Supplier reference: Vulcan’s material calculators provide aggregate estimating tools and local sales support.