Dirt Calculator
Estimate dirt volume in cubic yards and cubic feet, then convert it to tons and pounds using an editable bulk density. Calculate rectangular or circular areas, add a compaction allowance, and include a local price when planning fill or grading work.
Calculate Dirt Quantity
Enter the area, finished depth, density, and allowance.
Loose and compacted volume can differ. Density and compaction change with material, moisture, equipment, and site conditions.
How to Use the Dirt Calculator
Select the area shape and units, enter the surface dimensions, and use the finished dirt depth. Choose the nearest material type, edit density when supplier data is available, and apply a transparent allowance based on site conditions.
1. Measure the area
Use length and width for a rectangle or diameter for a circle. Divide irregular ground into smaller measurable sections.
2. Use finished depth
Enter the depth the project needs after placement. Excavation, settlement, and compaction may affect the amount of loose material ordered.
3. Confirm density and delivery
Compare yards, tons, and price with the supplier quote. Truck capacity must come from the hauler and should not be assumed from volume alone.
How Much Dirt Do I Need?
Dirt volume is based on area and finished depth. The calculator converts all measurements to feet, calculates cubic feet, and divides by 27 for cubic yards.
Estimated weight is calculated from an editable tons per cubic yard value. Dirt density varies with soil composition, rock content, moisture, and compaction, so supplier data provides a better estimate.
The allowance is added after base volume. It may represent compaction, settlement, uneven grading, or handling loss, but it should be chosen for the actual project rather than treated as a universal percentage.
Dirt Volume by Area and Depth
Cubic yards shown before adding compaction or extra material.
| Area | 3 inches | 6 inches | 12 inches |
|---|---|---|---|
| 100 sq ft | 0.93 yd³ | 1.85 yd³ | 3.70 yd³ |
| 250 sq ft | 2.31 yd³ | 4.63 yd³ | 9.26 yd³ |
| 500 sq ft | 4.63 yd³ | 9.26 yd³ | 18.52 yd³ |
| 1,000 sq ft | 9.26 yd³ | 18.52 yd³ | 37.04 yd³ |
Dirt for Common Projects
Choose material and allowance from the purpose of the work and supplier specification.
Filling low areas
Measure the average finished depth across the area. Large elevation changes require more detailed grading measurements.
Lawn and landscape grading
Calculate separate sections when depth varies. Drainage slope, soil quality, and final grade should follow site requirements.
Backfill and site work
Do not treat a material estimate as structural approval. Trenches, foundations, walls, utilities, and engineered fill require suitable professional guidance.
Measurements, Assumptions, and Ordering
The formulas are consistent, but the order depends on field measurements and real material behavior. Check elevations, finished depth, loose versus compacted volume, material density, and supplier rounding. The calculator supports quantity planning and does not replace soil testing, drainage design, structural engineering, excavation safety, or local requirements.
Dirt Calculator FAQ
How do I calculate cubic yards of dirt?
Multiply area by depth in feet, then divide cubic feet by 27.
How many tons are in a yard of dirt?
There is no single value. Multiply yards by a density that matches the supplied material.
How much dirt covers 100 square feet?
At 6 inches deep, the base volume is about 1.85 cubic yards.
Should I add for compaction?
Add an allowance only when material behavior and the project justify it. Confirm with the supplier or contractor.
Can this estimate truckloads?
Truckloads should be calculated only from a capacity supplied by the hauler and applicable weight limits.
What is the difference between dirt and topsoil?
Dirt is a broad material term. Topsoil is selected for surface soil purposes. Match the calculator and product to the job.