Gravel Calculator Formula
Choose a rectangle, circle or known area, multiply by depth, then use density to estimate tons.
Rectangle area = length x width
Circle area = pi x radius squared
Volume = area x depth
Tons = volume x density / 2,000
Example Calculation
A 30 ft by 12 ft gravel area at 3 inches deep is 90 cubic feet, or 3.33 cubic yards. At 100 lb/ft3 and 5% waste, estimate about 4.73 tons.
Calculation Notes
- Rectangle mode works well for driveways, paths and beds.
- Circle mode is useful for round beds, fire pit areas and circular features.
- Known-area mode keeps the form short if you already measured square footage.
- Gravel density varies by stone type, moisture and compaction.
FAQ
How many tons are in a cubic yard of gravel?
Many gravel types are roughly 1.3 to 1.5 tons per cubic yard.
Should I include waste?
Yes. Use about 5% for simple areas and more for irregular shapes or grading changes.
Can I calculate a circular gravel area?
Yes. Choose circle area and enter the diameter and depth.
What depth should I use for gravel?
Paths may use around 2 inches, while driveways and base layers are often deeper.