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
How to Calculate Gravel
Measure the area, choose the gravel depth, then convert the volume into cubic yards and tons.
Cubic feet = area x depth
Cubic yards = cubic feet / 27
Tons = cubic yards x tons per cubic yard
Cubic Yards to Tons for Gravel
Gravel is commonly estimated by cubic yards and tons. Density varies by gravel type, moisture, and compaction, so this calculator uses the selected gravel density for the tons estimate.
Gravel Base Calculator
Use the crushed base option and enter the base depth for driveway base, patio base, shed pad base, or paver base estimates.
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.