Currency: USD
Enter all amounts in USD. Changing currency keeps numbers unchanged; no exchange rate is applied.
- Volume
- 1.85 yd³
- Estimated weight
- 5,185.19 lb
- Material cost
- $92.59
How it works
Density matters differently across price units
Raising bulk density by 10% increases estimated weight by 10% at the same bed volume. It changes a weight-based quotation, but not a volume-based one. Match the supplier’s charging unit before comparing delivered material prices.
Using a material density for gravel estimates
A gravel volume estimate comes from the bed shape and depth, while a mass estimate also depends on the entered material density. Keep these quantities separate when comparing a supplier's price by volume with a price by weight. Bag sizes and cost assumptions should match the product being considered. Compaction and irregular ground can change the amount needed in practice.
Rectangular bed: formula and assumptions
Cubic yards = length×width×depth/12/27. Weight = volume×bulk density.
Bulk density is an editable estimate and varies by material, moisture, and compaction.
Circular bed and bags: formula and assumptions
Volume=π(diameter/2)²×depth; bag count=ceil(volume×density/bag weight).
Bulk density depends on stone size, moisture, and compaction.
Beds, bags & material costs: formula and assumptions
Volume = combined area × depth × (1 + allowance). Whole bags = ceiling(total material / bag size).
Combine beds before rounding bag counts. Bulk volume and weight prices use their selected units; bag prices apply to whole bags. Density is a user-entered assumption.
Worked example
Reference example currency: USD. These fixed examples do not change with your calculator preferences.
Using the Rectangular bed example:
- Length (ft)
- 20
- Width (ft)
- 10
- Depth (inches)
- 3
- Bulk density (lb/cubic yard)
- 2800
- Price per cubic yard ($)
- 50
Cubic yards = length×width×depth/12/27. Weight = volume×bulk density.
Example result
Volume: 1.85 yd³
Estimated weight: 5,185.19 lb
Material cost: $92.59
These are illustrative inputs. Change the values to explore a different scenario.
Formula references
References explain the underlying methods; they do not imply endorsement or individual professional review of Finflo.
Common questions
Why can the same gravel volume have different weights?
Bulk density depends on stone type, size, moisture and compaction. Enter a density appropriate to the material being ordered.
How is the bag count rounded?
The required modeled weight is divided by bag weight and rounded up to a whole bag, so purchased quantity may exceed the estimate.
Prepared by Finflo. See our methodology and editorial policy.