Gravel Calculator Formula
Understand the math behind the gravel calculator. Each variable explained with a worked example.
Formulas Used
Volume (Cubic Feet)
cubic_feet = length * width * depth_ftVolume (Cubic Yards)
cubic_yards = length * width * depth_ft / 27Weight (Tons)
tons = length * width * depth_ft / 27 * 1.4Variables
| Variable | Description | Default |
|---|---|---|
length | Length(feet) | 30 |
width | Width(feet) | 10 |
depth | Depth(inches) | 3 |
depth_ft | Derived value= depth / 12 | calculated |
How It Works
How to Calculate Gravel Needed
Formula
Cubic Yards = (Length × Width × Depth in feet) / 27
Tons = Cubic Yards × 1.4
Gravel weighs approximately 2,800 lbs (1.4 tons) per cubic yard. This can vary from 1.3 to 1.5 tons depending on the type and moisture content.
Worked Example
A driveway 30 ft long, 10 ft wide, with 3 inches of gravel.
- 01Depth in feet: 3 / 12 = 0.25 ft
- 02Volume = 30 × 10 × 0.25 = 75 cu ft
- 03Cubic yards = 75 / 27 = 2.78 cu yd
- 04Tons = 2.78 × 1.4 = 3.89 tons
Frequently Asked Questions
How many tons of gravel in a cubic yard?
Approximately 1.4 tons per cubic yard of gravel, though this varies by gravel type. Pea gravel is about 1.4 tons, crushed stone is about 1.4 tons, and river rock can be up to 1.5 tons.
How deep should a gravel driveway be?
A gravel driveway should be 4-6 inches deep with a compacted base. Use 3 layers: 4 inches of #3 stone base, 2 inches of #57 stone, and 2 inches of surface stone.
How much does a ton of gravel cover?
One ton of gravel covers approximately 80-100 sq ft at 2 inches deep, or about 50-60 sq ft at 3 inches deep.
Learn More
Guide
How to Calculate Concrete Volume
Learn how to calculate concrete volume for slabs, footings, columns, and walls using simple formulas. This guide covers cubic yard and cubic meter calculations for any concrete project.
Ready to run the numbers?
Open Gravel Calculator