Fill Dirt Calculator
Estimate fill dirt volume for low spots, yard grading, site prep, backfill, driveway subgrade, erosion repair, land shaping, and leveling projects. Calculate cubic yards, tons, compacted quantity, truckloads, delivery, spreading cost, and total budget.
Calculate Fill Dirt Needed
Your Fill Dirt Estimate
Formula used:
Practical recommendation:
Quick Formula Box
Area = length × width
Depth in feet = fill depth in inches ÷ 12
Base cubic feet = area × depth in feet
Base cubic yards = base cubic feet ÷ 27
Order cubic yards = base cubic yards × (1 + extra allowance %) × (1 + compaction/settlement %)
Estimated tons = order cubic yards × tons per cubic yard
Truckloads = ceil(order cubic yards ÷ truck capacity)
Total cost = material cost + delivery + labor + equipment + tax
Fill Dirt Reference Table
| Fill Material | Best Use | Typical Planning Weight | Compaction Guidance | Common Mistake |
|---|---|---|---|---|
| Clean fill dirt | General grade raising, filling holes, shaping land | About 1.0–1.3 tons per cu yd | Add 10%–15% for normal settling | Assuming loose fill will stay at the placed height |
| Screened fill dirt | Cleaner grading where rocks and debris are undesirable | About 1.1–1.3 tons per cu yd | Compact in shallow lifts for better stability | Paying for screened fill where rough fill is acceptable |
| Clay-heavy fill | Shaping grade, berms, low-permeability fill | About 1.3–1.6 tons per cu yd | May compact well but can hold water | Using clay fill where drainage is needed |
| Sandy fill dirt | Drainage-friendly fill and lighter grading | About 1.0–1.2 tons per cu yd | Settles differently than clay; compact evenly | Expecting sandy fill to hold steep shapes |
| Structural fill blend | Driveway base, building pads, engineered areas | About 1.2–1.5 tons per cu yd | Follow specification and compaction requirements | Using ordinary fill dirt for structural support |
| Backfill around walls | Retaining walls, foundations, trenches | Depends on material | Place in lifts; drainage may be required | Backfilling with poor-draining soil against walls |
| Yard low spot repair | Small depressions and settlement areas | Usually 1.0–1.3 tons per cu yd | Use thin layers when grass is present | Adding too much depth and creating drainage problems |
| Rough grading | Large grade changes before final topsoil | Varies by source | Plan for higher settlement allowance | Skipping finish topsoil after rough fill |
| Driveway subgrade | Preparing base below gravel or pavement | Often weight-limited in trucks | Needs firm compaction and drainage | Using soft organic soil as fill |
| Bulk delivery | Most projects over 2 cubic yards | Truck may be volume or weight limited | Confirm dump location and access | Forgetting delivery and equipment cost |
How to Use the Fill Dirt Calculator
Fill Dirt Calculator Guide
A fill dirt calculator helps estimate how much fill material is needed to raise grade, fill low spots, backfill trenches, shape yards, prepare driveway subgrade, repair erosion, or build up land before adding topsoil. Fill dirt is usually sold by the cubic yard in bulk, while hauling and delivery may be priced by truckload, ton, cubic yard, or flat delivery fee. A clear estimate helps you order the right quantity and avoid paying for extra deliveries or leftover soil.
The basic formula is length multiplied by width multiplied by depth. Because length and width are normally measured in feet and depth is often measured in inches, the depth must be converted to feet before calculating cubic feet. Then the cubic feet are divided by 27 to convert to cubic yards. This calculator also adds real-world allowances for compaction, settlement, uneven grade, measurement error, and spreading loss.
What This Fill Dirt Calculator Does
This tool estimates square footage, base cubic feet, base cubic yards, adjusted order cubic yards, tons, truckloads, fill dirt material cost, delivery cost, optional spreading or grading labor, equipment cost, tax, and total project cost. It is designed for homeowners, landscapers, contractors, sitework crews, property managers, and DIY users who need a fast planning estimate.
The calculator uses only the minimum required inputs by default: length, width, depth, and fill material type. Advanced Options are available for users who want more control over compaction, extra allowance, truck size, cost per cubic yard, delivery fees, labor, equipment, and tax. This keeps the tool fast for first-time users while still making it useful for more detailed project planning.
Why Fill Dirt Estimating Matters
Fill dirt projects are easy to underestimate. A shallow layer spread over a large area can require several cubic yards. A deep low spot, trench, or grade correction can require many truckloads. Fill also settles after placement, especially when it is loose, wet, or not compacted in layers. If you order the exact geometric volume without any allowance, the finished area may end up lower than planned.
Ordering too little fill dirt can delay the project and create another delivery charge. Ordering too much can leave a pile that must be moved, stored, or hauled away. A good fill dirt estimate includes the base volume plus allowances for compaction and site variation. It also considers whether the material must support weight, drain water, or simply reshape a landscape area.
Fill Dirt Formula Explained
The standard fill dirt formula is:
Cubic feet = length × width × depth in feet
If the fill area is 30 feet long and 15 feet wide:
30 × 15 = 450 square feet
If the average fill depth is 6 inches:
6 ÷ 12 = 0.5 feet
Now calculate cubic feet:
450 × 0.5 = 225 cubic feet
Convert cubic feet to cubic yards:
225 ÷ 27 = 8.33 cubic yards
If you add 10% extra and 15% compaction or settlement:
8.33 × 1.10 × 1.15 = 10.54 cubic yards
Base Volume vs Order Volume
Base volume is the exact geometric fill space before practical adjustments. Order volume is the amount you should consider buying after adding allowance for compaction, settlement, uneven grade, and installation loss. For loose fill spread over a yard, a lower allowance may be acceptable. For compacted fill under a driveway, patio, wall, or heavy-use area, the allowance should be higher and the material should be placed correctly.
Fill placed in thick lifts can settle unevenly. Where stability matters, fill should often be placed in shallow layers and compacted before adding the next layer. For structural areas, such as building pads, driveway subgrades, retaining wall backfill, or load-bearing surfaces, use appropriate material and follow local specifications or professional guidance.
Choosing the Right Fill Dirt
Clean fill dirt is commonly used for general grade raising, filling holes, shaping yards, and rough land improvement. Screened fill dirt has fewer rocks, roots, and debris, making it easier to spread and grade. Clay-heavy fill may compact well but can hold water and cause drainage problems. Sandy fill drains better but may not hold shape as strongly. Structural fill blends are used where stability and compaction matter more than low cost.
Fill dirt is different from topsoil. Fill dirt is used to build volume and shape the land. Topsoil is used as the growing layer for grass, plants, and landscape beds. A common approach is to use fill dirt for the lower volume and then add several inches of topsoil for the finished surface. Using topsoil for deep fill is often expensive, while using fill dirt as a final planting layer may lead to poor plant growth.
Practical Applications
Homeowner Uses
Contractor Uses
Depth and Compaction Guidelines
For shallow yard leveling, a small depth may be enough, but avoid burying existing grass too deeply if you want it to survive. For low spots and rough grading, fill depth may vary across the area, so the average depth matters more than the maximum depth. For deep fill, compaction becomes more important because loose material can settle over time.
Compaction allowance depends on material, moisture, lift thickness, and equipment. A 10% to 15% allowance is common for many planning estimates. Heavy compaction, wet soil, clay-heavy fill, or deep lifts may require a larger allowance. For driveways, structural pads, retaining walls, or areas near buildings, get guidance from a qualified contractor or engineer.
Common Mistakes to Avoid
One common mistake is using final surface dimensions without accounting for slopes, low areas, or transitions. Another is ordering the exact calculated volume with no settlement allowance. Users also sometimes confuse fill dirt with topsoil. Fill dirt builds grade; topsoil supports plant growth. For lawns and planting areas, you may need both: fill dirt below and topsoil above.
Another mistake is ignoring truck access. Bulk fill dirt is heavy, and delivery trucks need a safe place to enter, turn, and dump. Soft driveways, overhead wires, narrow gates, steep slopes, and wet ground can limit delivery options. Ask the supplier about truck size, capacity, delivery location, dump fees, and whether pricing is based on cubic yards or tons.
Drainage is also critical. Filling a low spot can move water somewhere else. Before adding large amounts of fill dirt, think about where water will flow after the grade changes. Avoid blocking swales, burying drainage outlets, or creating runoff toward foundations, neighboring properties, driveways, or patios.
Expert Recommendations
Use fill dirt for volume and shape, not as the final planting layer. Add topsoil where grass, shrubs, or garden beds will be installed. For compacted fill, place material in layers and compact each lift. Add at least 10% allowance for typical projects and more for rough grade, deep fill, or high settlement risk.
For small low spots, measure the area carefully and consider multiple shallow applications instead of one thick layer. For large grading projects, request a supplier quote and contractor review. For areas that support structures, vehicles, retaining walls, or drainage systems, use appropriate material and professional guidance.
Conclusion
This fill dirt calculator estimates cubic yards, cubic feet, tons, truckloads, material cost, delivery, labor, equipment, tax, and total project budget. It helps homeowners, landscapers, and contractors plan fill dirt quantities more accurately by including extra allowance and compaction. Final ordering should be confirmed with actual site measurements, supplier density, fill material quality, compaction requirements, access, drainage, local pricing, and project specifications.