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How to Use the Dirt Volume Calculator
This calculator helps you estimate the total volume of dirt for any project — whether you're filling a foundation, grading a lot, or hauling away excavated material.
Step-by-step:
- Enter dimensions — Input the length, width, and depth of your dirt area in feet (or inches for depth).
- Select expansion — Choose "In a Pile" for existing stockpiled dirt, or "To be Excavated (+35%)" to account for the volume increase when dirt is dug up and loosened.
- Choose a truck type — Optionally select your truck to see how many loads you'll need.
- Add pricing — Enter your cost per truckload to get a total cost estimate.
Understanding Dirt Expansion
When dirt is excavated from the ground, it expands in volume — typically by about 35%. This is called the "swell factor" or "fluff factor." Dirt in the ground is compacted by natural pressure. Once dug up, air pockets form and the material takes up more space. Our calculator accounts for this so your truckload estimates are accurate.
Frequently Asked Questions
How many cubic yards are in a truckload?
It depends on the truck. A standard 10-wheeler holds about 10 cubic yards, an end dump holds 18, and a belly dump holds 20. Our calculator lets you select your specific truck type for accurate estimates.
What is the dirt expansion factor?
When dirt is excavated, it typically expands by about 35% in volume due to air pockets. This is known as the swell or fluff factor. If you're calculating material to be excavated, always account for this expansion.
How do I convert cubic feet to cubic yards?
Divide cubic feet by 27. There are 27 cubic feet in one cubic yard (3ft × 3ft × 3ft = 27 cu ft).
Is this calculator accurate for irregular shapes?
This calculator works best for rectangular areas. For irregular shapes, try breaking the area into smaller rectangles, calculating each separately, and adding the results together.
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