Construction calculator
Gravel Calculator
Estimate gravel volume for walkways, patios, drainage layers, landscaping, and base material.
Material estimate
Gravel Calculator
Gravel depth varies by use; walkways often use around 4 inches.
Selected bag
0.5 cu ft
0.5 cu ft bag
Estimated material needed
1.358 cu yd
Includes 10% extra. Base estimate is 1.235 cu yd.
Base cubic feet
33.33 cu ft
Before extra allowance
With extra
36.67 cu ft
Used for bag count
Estimated bags
74
At 0.5 cu ft per bag
Formula
cubic yards = square feet x depth in feet / 27
Bag count is estimated by converting cubic yards to cubic feet, applying extra allowance, then dividing by the bag size.
Common Examples
| Area | Depth | Base volume |
|---|---|---|
| 100 sq ft | 2 in | 0.617 cu yd |
| 100 sq ft | 4 in | 1.235 cu yd |
| 300 sq ft | 4 in | 3.704 cu yd |
| 500 sq ft | 6 in | 9.259 cu yd |