Gravel Calculator
Estimate how much gravel you need for driveways, walkways, landscaping, drainage areas, and other projects.
Enter the project dimensions and desired gravel depth to calculate the estimated volume of gravel required.
Calculate Gravel Quantity
Enter the area, gravel depth, and waste allowance to estimate the required gravel volume.
Gravel Requirement
Gravel Calculation Summary
Project Area
—
Gravel Depth
—
Gravel Required
—
With Allowance
—
How to Use the Gravel Calculator
Enter the length and width of the area you want to cover. Then enter the desired depth of gravel and select the appropriate depth unit.
The calculator determines the required gravel volume and can add a waste or settling allowance to provide a more practical purchasing estimate.
- Enter the project length.
- Enter the project width.
- Enter the desired gravel depth.
- Select the depth unit.
- Enter a waste or settling allowance.
- Click Calculate Gravel.
Gravel Calculator Formula
Gravel volume is based on the area being covered and the desired material depth.
Project Area = Length × Width
Gravel Volume = Project Area × Gravel Depth
Volume With Allowance = Gravel Volume × (1 + Allowance % ÷ 100)
The calculator converts the result between cubic feet, cubic yards, and cubic meters so you can compare the estimate with different supplier measurement systems.
Gravel Calculation Example
Suppose you want to cover an area that is 20 feet long and 10 feet wide with a gravel layer 4 inches deep.
The calculator converts the depth into feet, calculates the total project volume, and then applies the selected waste or settling allowance.
The final result is provided in cubic feet, cubic yards, and cubic meters to make material ordering easier.
Important Information About Gravel Estimates
Gravel depth should be selected according to the purpose of the project, the type of gravel being used, the underlying surface, drainage requirements, and local construction practices.
Gravel can settle after installation, especially when the base is not fully compacted. An allowance can help provide additional material for settling and practical losses.
Actual quantities may vary because of grading, moisture, compaction, delivery conditions, and the shape of the project area.
Frequently Asked Questions
What does a gravel calculator calculate?
It estimates the volume of gravel required based on the project area, gravel depth, and optional waste or settling allowance.
How is gravel quantity calculated?
The project area is multiplied by the required gravel depth to determine the basic volume. An allowance can then be added.
Can I calculate gravel in cubic yards?
Yes. The calculator provides the result in cubic feet, cubic yards, and cubic meters.
How much waste allowance should I use?
The appropriate allowance depends on the project. A small percentage can account for settling, spreading, handling losses, and measurement differences.