Calculating Cubic Yards: Formula and Examples
Learn how to calculate cubic yards for concrete, mulch, gravel, soil, and other materials using length, width, and depth.
Searching calculating cubic yards usually means you need to estimate material for concrete, mulch, gravel, or soil. Cubic yards measure volume, not area, so you need length, width, and depth.
Cubic Yards Formula
Cubic yards = (Length x Width x Depth in feet) / 27
Why 27? Because:
1 cubic yard = 3 ft x 3 ft x 3 ft = 27 cubic feet
Example
Suppose a garden bed is:
- Length: 12 ft
- Width: 6 ft
- Depth: 0.5 ft
Volume in cubic feet:
12 x 6 x 0.5 = 36 cubic feet
Convert to cubic yards:
36 / 27 = 1.33 cubic yards
If Depth Is in Inches
Convert inches to feet first.
Example:
6 inches = 0.5 feet
3 inches = 0.25 feet
Common Uses
- Concrete pours
- Mulch delivery
- Gravel driveways
- Topsoil orders
- Landscaping fill
The Bottom Line
To calculate cubic yards, multiply length, width, and depth in feet, then divide by 27. Add a little extra if you expect settling, waste, or uneven ground.
How to Calculate: Step-by-Step Guide
Measure the space
Record the length, width, and depth of the area you want to fill.
Convert to feet
Use feet for all measurements before calculating volume.
Divide cubic feet by 27
One cubic yard equals 27 cubic feet, so divide by 27 to convert.