What is a dirt calculator? A dirt calculator converts the dimensions of your project (length × width × depth) into the precise volume of material needed in cubic yards and tons. It helps estimate delivery costs for fill dirt, topsoil, gravel, sand, and mulch.
How to Use This Dirt Calculator
Our dirt and fill calculator helps you determine the exact amount of material needed for landscaping, grading, and construction projects. Whether you're filling a hole, building raised garden beds, or preparing a site for construction, this tool calculates volume in cubic yards, tons, and provides cost estimates.
Step 1: Choose Your Material Type
Different projects require different materials. Here's a guide to help you choose:
- Fill Dirt - Inexpensive soil for filling holes, grading, and backfill. Contains rocks, clay, and subsoil. Not suitable for planting.
- Topsoil - Nutrient-rich surface soil for lawns, gardens, and landscaping. Should be dark and crumbly.
- Screened Topsoil - Premium topsoil filtered to remove rocks, roots, and debris. Best for fine gardening.
- Garden Mix - Blend of topsoil, compost, and amendments. Ideal for vegetable gardens and flower beds.
- Sand - For drainage, leveling pavers, and mixing with soil. Play sand vs. construction sand matters.
- Gravel - Crushed stone for driveways, drainage, and base material. Sizes from pea gravel to 3/4" stone.
- Mulch - Wood chips or bark for landscaping beds. Suppresses weeds and retains moisture.
- Compost - Organic matter for soil amendment. Improves soil structure and adds nutrients.
Step 2: Select Your Area Shape
Our calculator supports multiple shapes to match your project area:
- Rectangle/Square - Most common for garden beds, patios, and standard areas
- Circle - For round flower beds, tree wells, and fire pit areas
- Triangle - Corner areas and angled sections
- Irregular - Enter total square footage if you've already measured a complex shape
Step 3: Enter Dimensions
Measure your area in feet for length and width. Enter depth in inches - this is the most common source of calculation errors. Remember:
- Lawns: 2-4 inches of topsoil for new grass
- Garden Beds: 4-6 inches minimum, 8-12 inches for raised beds
- Fill Projects: Varies by depth needed, account for settling
- Mulch: 2-4 inches for weed control and moisture retention
Understanding Compaction Factor
When you dump loose material, it settles and compacts over time - especially fill dirt and gravel. The compaction factor adds extra material to compensate:
- 10-15% - Standard for most landscaping projects
- 20-25% - Fill dirt and foundation backfill
- 5-10% - Mulch and compost (minimal settling)
Pro Tip: It's always better to have slightly too much material than to run short mid-project. Most suppliers won't accept returns of bulk materials.