Professional Gravel & Stone Calculator
Calculate the exact amount of gravel, sand, or crushed stone needed for your project.
*Estimation includes a standard 5% waste factor for compaction and leveling.
How to Calculate Gravel for Your Project
Planning a driveway, patio base, or garden path requires precise measurements to avoid overspending or running out of material mid-project. Our gravel calculator simplifies this process by converting your dimensions into the two most common ordering units: Cubic Yards and Tons.
The Mathematical Formula
To calculate gravel manually, use the following steps:
- Calculate Square Footage: Multiply Length (ft) × Width (ft).
- Convert Depth: Divide the desired depth in inches by 12 to get depth in feet.
- Calculate Cubic Feet: Multiply Square Footage × Depth (ft).
- Convert to Cubic Yards: Divide Cubic Feet by 27 (there are 27 cubic feet in a cubic yard).
- Convert to Tons: Multiply Cubic Yards by the density factor (typically 1.4 tons per yard for standard gravel).
Real-World Example
Suppose you are building a gravel driveway that is 40 feet long and 10 feet wide, and you want a depth of 4 inches.
- 40 ft × 10 ft = 400 sq. ft.
- 4 inches ÷ 12 = 0.333 ft.
- 400 sq. ft. × 0.333 ft = 133.2 cubic feet.
- 133.2 ÷ 27 = 4.93 cubic yards.
- 4.93 yards × 1.4 = 6.9 tons.
Common Gravel Densities
Different materials have different weights. While 1.4 tons per cubic yard is standard for crushed stone, pea gravel is slightly lighter (~1.2 tons), and wet sand can be much heavier (~1.6 tons). Always consult with your local quarry or supplier for the specific density of the product you are purchasing.
Ordering Tips
It is standard practice in the landscaping industry to order 5% to 10% more material than the exact calculation. This accounts for settling, compaction (especially if using a plate compactor), and uneven sub-base surfaces. If your calculation results in 9.2 tons, ordering 10 tons is usually the safest bet.