Convert a gravel layer into cubic yards, bulk weight or bags
Landscaping gravel is ordered by more than its visible square footage. A path that is 20 feet long and 10 feet wide requires a different amount of gravel at three inches deep than at two inches. Measure the finished length and width, specify the intended compacted depth, and enter a sensible allowance for handling and placement. The resulting cubic-foot volume is converted into cubic yards for bulk ordering.
Suppliers may sell gravel by the ton, cubic yard or bag. A ton is a weight, while a cubic yard is a volume. The conversion depends on the stone type, particle gradation and moisture, so the density is a user-entered value rather than a fixed claim. Bag purchases instead depend on the labeled volume yielded by each package. The purchase selector applies one method at a time to avoid counting both bulk and bagged material in the total.
Gravel volume and purchase formulas
Required volume (cu ft) = area × depth (in) ÷ 12
Order volume (cu yd) = required volume × (1 + allowance ÷ 100) ÷ 27
Bulk short tons = order volume (cu yd) × entered short tons per cubic yard
Whole bags = ceil(order volume (cu ft) ÷ labeled bag yield)
Worked example: a 200-square-foot gravel path
A 20-by-10-foot path at three inches deep contains 200 × 3 ÷ 12 = 50 cubic feet of in-place gravel, equivalent to about 1.85 cubic yards. Adding 10% produces 55 cubic feet, or approximately 2.04 cubic yards to order. If the material supplier reports a density of 1.4 short tons per cubic yard, the modeled bulk weight is about 2.85 short tons.
If each bag contains 0.5 cubic feet, the alternative bag order is 110 complete bags. These are two ways to purchase the same volume, not quantities to add together. Prices are calculated only for the purchasing method selected.
Depth, compaction and delivery can change the order
The specified depth is the finished gravel thickness. Loose material can settle or compact, so suppliers may recommend a separate loose-to-compacted conversion for certain aggregate products. This calculator has a general order allowance but does not claim that a single percentage captures every compaction condition. Drainage layers, weed barriers, edging and excavated subgrade should be evaluated separately before installation.
Garden beds, paths and driveways have different material needs. The chosen gravel size affects walkability, drainage and compaction; it does not alter the basic volume calculation. For irregular areas, divide the plan into smaller rectangles and add the quantities. Compare the estimate with the supplier's minimum load, delivery charge and actual product density before ordering.
Landscape gravel questions
How many tons are in one cubic yard of gravel?
There is no universal conversion. Different aggregates have different bulk densities, and moisture content can also affect weight. Enter the short-tons-per-cubic-yard figure supplied for the selected product to estimate tons from measured cubic yards.
Can I calculate bags and bulk gravel together?
The page displays both quantity alternatives for comparison, but the optional cost total uses only the purchasing method selected. This prevents paying twice for the same assumed volume. A mixed order requires calculating the areas assigned to each purchasing method separately.
Does the calculator include gravel compaction?
It applies the allowance you enter but does not infer compaction behavior from the material name. Ask the supplier whether the specified bulk yield is loose or compacted and adjust the order according to the actual planned layer.