Fill Dirt Calculator

How It Works

Fill dirt is subsoil or excavated earth used to raise ground level, fill holes, and grade terrain. Unlike topsoil, it contains little organic matter, which actually makes it more stable for structural purposes like foundations and retaining walls.

The Formula

Variables

• L — Length of the area in feet
• W — Width of the area in feet
• D — Average depth needed in inches
• 1.2 — Approximate weight of fill dirt in tons per cubic yard

Example

A 20 ft x 15 ft low area at 6 inches deep needs 150 cu ft = 5.56 cubic yards = 6.67 tons. At $15/yard that costs about $83.

Tips

• Fill dirt is often available free from construction sites; check local classifieds and excavation companies.
• Never use fill dirt as a planting medium; it lacks nutrients and organic matter needed for plant growth.
• Compact fill dirt in 4-6 inch lifts to prevent settling over time.
• Clean fill dirt should be free of debris, contaminants, and large rocks. Always ask about the source.
• Delivery charges often cost more than the dirt itself, so get quotes that include delivery.