Dirt Calculator

Fill Dirt Volume & Tonnage Reference Table (4" Standard Depth)

Quick estimation matrix comparing uncompacted in-place yards against mechanical compaction (+15%) and commercial tandem dump truck deliveries.

Footprint Area	Project Application	Base Volume (4" Depth)	With 15% Compaction	Weight (Tons @ 1.15 t/yd³)	Tandem Trucks (12 yd³)
100 sq ft	Shed Pad Base / Small Garden Leveling	1.23 yd³	1.42 yd³	1.63 tons	0.12 (Order Pickup / ~40 Bags)
250 sq ft	Walkway Subgrade / Low Lawn Depressions	3.09 yd³	3.55 yd³	4.08 tons	0.30 (Small Dump Delivery)
500 sq ft	Single-Car Driveway Base / Swale Grading	6.17 yd³	7.10 yd³	8.16 tons	0.59 (Single-Axle Truck)
1,000 sq ft	Backyard Regrading / Foundation Slope	12.35 yd³	14.19 yd³	16.32 tons	1.18 (Order 2 Tandem Trucks)
2,500 sq ft	Extensive Yard Resection / Lot Leveling	30.86 yd³	35.49 yd³	40.81 tons	2.96 (Order 3 Tandem Trucks)
5,000 sq ft	Full Residential Lot Grading / Commercial Pad	61.73 yd³	70.99 yd³	81.64 tons	5.92 (Order 6 Tandem Trucks)

*Note: Standard residential fill dirt is benchmarked at a loose quarry density of 1.15 tons per cubic yard (2,300 lbs/yd³). Heavy saturated clays or dense sandy fills require additional tonnage capacity.

How the Dirt Calculator Works: Math, Formulas & Compaction

Estimating dirt for site grading, excavation backfill, or structural pad preparation requires converting three-dimensional geometric space into commercial volumetric units (cubic yards) while accounting for soil physics. Unlike rigid construction materials such as concrete slabs or steel rebar, earthwork involves porous materials that expand when loosened (bulking) and dramatically compress when rolled or tamped (settlement shrinkage).

Primary Earthwork Formulas

1. Area Grading VolumeBase Cubic Yards = (Length ft × Width ft × Depth in) ÷ 324

Or: (Area sq ft × Depth in) ÷ 324

2. Compaction Shrinkage BufferOrdered Yards = Base In-Place Yards × (1 + Compaction%)

Compaction factor typically ranges from 10% to 20%

3. Trench / Excavation BackfillTrench Yards = (Length ft × Width ft × Depth ft) ÷ 27

Subtract foundation footing or drainage pipe displacement

4. Landscape Berm / Mound VolumeBerm Yards = (0.5 × Base Width ft × Peak Height ft × Length ft) ÷ 27

Triangular cross-section geometric prism

Step-by-Step Worked Example: Backyard Grading Takeoff

Consider a homeowner regrading an uneven backyard measuring 50 feet in length by 20 feet in width to establish positive slope away from their foundation. The project requires an average fill depth of 4 inches using standard clean fill dirt, finished with a vibratory plate compactor (+15% compaction allowance).

Calculate Surface Area: 50 ft × 20 ft = 1,000 square feet.
Convert Depth to Feet: 4 inches ÷ 12 inches/ft = 0.3333 feet.
Compute Base Cubic Feet: 1,000 sq ft × 0.3333 ft = 333.33 cubic feet.
Convert to Base Cubic Yards: 333.33 cu ft ÷ 27 cu ft/yd³ = 12.35 cubic yards.
Apply 15% Compaction Shrinkage: 12.35 yd³ × 1.15 = 14.20 ordered cubic yards (an additional 1.85 yards of soil to counter settlement).
Determine Tonnage: 14.20 yd³ × 1.15 tons/yd³ = 16.33 US short tons (32,660 lbs).
Determine Dump Truck Delivery: 14.20 yd³ ÷ 12 yd³ tandem truck capacity = 1.18 loads. Because a single 12-yard truck will leave you 2.2 yards short, the contractor must schedule two deliveries or request a larger tri-axle truck (16 yd³ capacity).

Dirt vs. Topsoil: When to Use Fill Dirt, Loam, or Garden Mix

One of the most expensive and structurally destructive mistakes in residential site preparation is confusing fill dirt with topsoil. While both originate from the earth, they occupy entirely different horizons within the soil profile and serve opposite construction functions.

Clean Fill Dirt (Subsoil)

Excavated from the lower B-horizon and C-horizon layers beneath the organic topsoil zone (typically 8 to 24 inches below grade). It is composed primarily of inorganic subsoil, sand, clay, silt, and small aggregate stones.

Organic Content: Less than 1% to 2% (zero decomposing matter).
Structural Stability: Highly compactable, interlocks firmly, does not rot or degrade over time.
Best Used For: Backfilling foundation walls, filling deep swales or holes (>3 inches), raising subgrades under concrete driveways, paver patios, and structural pole barns.
Warning: Poor fertility; grass seed or turf will struggle to root without a topsoil cap.

Screened Topsoil (A-Horizon)

The biologically active uppermost 2 to 8 inches of the soil profile. It is enriched with decayed leaves, microbial bacteria, humic compost, worms, and essential plant nutrients (Nitrogen, Phosphorus, Potassium).

Organic Content: 5% to 15% active organic matter.
Structural Stability: Unstable under loads. Organic matter rots and compresses, leaving hollow voids.
Best Used For: The top 2 to 4-inch root zone for hydroseeding, Kentucky bluegrass sod, raised vegetable garden beds, and shrub borders.
Warning: Never use topsoil as deep backfill beneath concrete, foundations, or roads. It will settle unevenly and cause catastrophic slab cracking. For organic blends, use our dedicated Topsoil Calculator.

The Contractor 2-Step Layering Rule:

If your lawn has low spots deeper than 3 inches, never fill the entire depression with expensive topsoil. Fill the lower portion with economical, compactable fill dirt up to 3 inches below finished design grade. Compact the subsoil firmly, then spread a 3-inch surface layer of screened topsoil for lawn turf or planting. This ensures both rock-solid structural grade and fertile plant rooting.

Soil Compaction & Settlement: The Critical 15% to 20% Shrinkage Rule

In civil earthmoving and geotechnical engineering, soil volume is categorized into three distinct states: Bank Cubic Yards (BCY) (soil in its natural, undisturbed state in the ground), Loose Cubic Yards (LCY) (soil fluffed up and aerated after mechanical excavation and dump truck dumping), and Compacted Cubic Yards (CCY) (soil mechanically consolidated into a dense, finished mass).

Why Does Fill Dirt Shrink After Placement?

When a track excavator bucket bites into the earth and dumps dirt into a haul truck, individual clumps fragment. Air enters the matrix, increasing the bulk volume by 20% to 30% (known as the soil bulking factor or swell). However, once this loose dirt is pushed into your yard or trench and tamped with a mechanical plate compactor, jumping jack rammer, or vibratory roller, the microscopic air voids are forcibly expelled. Under ASTM D698 (Standard Proctor Test) principles, soil particles reorient into their maximum dry density configuration.

Furthermore, rainfall naturally accelerates hydro-consolidation. Rain droplets lubricate clay and silt platelets, pulling them closer together via surface tension and gravity. If you order only the exact geometric volume without a compaction factor, your freshly graded yard will settle 1 to 2 inches below your sidewalk, patio edge, or driveway within two rainy seasons, creating standing water ponds and foundation seepage.

Recommended Compaction Allowances by Application:

10% Buffer

Light lawn leveling, hand rake leveling, broadcast topdressing, and decorative landscape mounds without vehicular loads.

15% Buffer (Standard)

Recommended baseline for yard resection, slope grading away from houses, swale re-contouring, and mechanical plate tamping.

20% Buffer

Deep utility trench backfill (plumbing, sewer, electrical lines), foundation perimeter backfill, and subgrade preparation beneath concrete pads.

The Lift Thickness Rule (Crucial Contractor Tip)

Never dump 12 or 24 inches of loose fill dirt into a trench all at once and expect a plate compactor to consolidate it. Vibratory force from standard walk-behind compactors penetrates only 6 inches deep. Always backfill and compact in progressive 4 to 6-inch loose "lifts". Tamp each lift thoroughly before dumping the next layer. This prevents subgrade cavities that later cause sinkholes.

How Much Does a Yard of Dirt Weigh? Tons vs. Cubic Yards

While dirt volume is calculated in cubic yards, commercial quarries, sand and gravel pits, and trucking outfits bill by weight across certified axle scales in US short tons (2,000 lbs). Understanding soil density prevents unexpected invoice surcharges and ensures haul vehicles remain within legal gross axle weight ratings (GAWR).

Soil & Dirt Classification	Weight per Cu Ft	Weight per Cu Yd (Lbs)	Tons per Cu Yd
Standard Clean Fill Dirt (Subsoil)	85 lbs/ft³	2,300 lbs	1.15 tons
Sandy Fill / Granular Earth	96 lbs/ft³	2,600 lbs	1.30 tons
Heavy Wet Clay Fill / Dense Dirt	104 lbs/ft³	2,800 lbs	1.40 tons
Screened Loam / Topsoil Blend	78 lbs/ft³	2,100 lbs	1.05 tons
Loose Dry Stockpile Soil	74 lbs/ft³	2,000 lbs	1.00 tons

The Moisture Multiplier Warning:

Soil is hydroscopic. A sustained soaking rainfall on an uncovered quarry pile can increase its water content from 10% to over 30%. Saturated clay fill dirt can spike from 2,300 lbs/yd³ up to 3,000 lbs/yd³ without changing its volume. When ordering by the ton during rainy spring weather, you will receive fewer cubic yards per ton paid. Always purchase from suppliers who cover stockpiles or order on dry weather cycles.

Ordering and Hauling Dirt: Dump Trucks, Pickups & Delivery Costs

Navigating dirt delivery logistics involves matching project volume with the appropriate haul vehicle. Transporting loose earth is heavy, dirty, and governed by strict DOT axle weight limits.

Single-Axle Dump TruckCapacity: 5 to 7 Cubic Yards

Carries 6 to 8 tons. Maneuverable in tight residential cul-de-sacs, alleyways, and properties with low overhead tree branches. Perfect for small patio subbases and minor lawn leveling.

Tandem-Axle Dump TruckCapacity: 10 to 12 Cubic Yards

Carries 12 to 14 tons. The standard commercial workhorse for residential grading, driveway base installations, and foundation backfill. Delivers the optimal balance between volume and driveway access.

Tri-Axle Commercial TruckCapacity: 14 to 16 Cubic Yards

Carries 16 to 19 tons with an extra drop-axle. Maximum cost-efficiency for large lot resections and major civil site development. Requires a wide, unobstructed turning radius and heavy asphalt driveway.

Can You Haul Dirt in Your Personal Pickup Truck?

While a standard 6.5-foot or 8-foot pickup truck bed physically holds 2 to 3 cubic yards of material, payload weight capacity is the true limiting factor. A typical 1/2-ton pickup (Ford F-150, Ram 1500, Chevrolet Silverado 1500) has an allowable cargo payload between 1,400 and 1,900 lbs. Because one cubic yard of clean fill dirt weighs 2,300 lbs, loading a full yard will bottom out rear leaf springs, overheat transmission fluids, blow tire sidewalls, and dangerously compromise front-wheel steering control.

Contractor rule: Never load more than 0.5 to 0.65 cubic yards (approx. 1,200 to 1,500 lbs) in a half-ton pickup truck bed. For any project exceeding 2 cubic yards, ordering bulk dump truck delivery is safer, faster, and cheaper than making 4 to 6 separate trips.

Fill Dirt Pricing & Delivery Economics

Bulk fill dirt is among the most affordable earth materials:

Unscreened Clean Fill Dirt: $10 to $18 per cubic yard ($12 to $22 per ton). Contains occasional stones or clay clumps. Ideal for rough subgrades deeper than 6 inches.
Screened Fill Dirt: $18 to $28 per cubic yard ($20 to $32 per ton). Screened through a 1/2-inch to 3/4-inch trommel to remove all stones, sticks, and roots. Perfect for precision grading and trench backfilling.
Delivery Haul Fees: Most local gravel pits and earthmoving haulers charge a flat delivery fee ranging from $75 to $150 per truckload within a 15-mile radius, plus $3 to $5 per mile outside their standard shipping zone.
Bagged Retail Dirt (Home Depot / Lowe's): Retail 40 lb bags cost $2.50 to $3.50 each. Because it requires roughly 54 bags to yield one cubic yard, purchasing bagged dirt costs approximately $135 to $190 per cubic yard—roughly 600% more expensive than bulk delivery! Reserve bags strictly for patching minor 10 sq ft dog holes or post anchor backfills.

Frequently Asked Questions

How many cubic yards of dirt are in a dump truck?

A standard tandem-axle commercial dump truck carries 10 to 12 cubic yards of fill dirt (approximately 12 to 14 tons). Larger tri-axle dump trucks carry 14 to 16 cubic yards, while small single-axle delivery trucks carry 5 to 7 cubic yards. Highway end-dump semi-trailers carry 20 to 24 cubic yards.

How much does one cubic yard of dirt weigh in tons?

On average, one cubic yard of standard clean fill dirt weighs approximately 1.15 US short tons (2,300 lbs). Sandy fill dirt weighs roughly 1.30 tons (2,600 lbs), and dense, wet clay soil can weigh up to 1.40 to 1.50 tons (2,800 to 3,000 lbs) per cubic yard. Dry, loose stockpile earth weighs around 1.00 ton (2,000 lbs).

What is the difference between fill dirt and topsoil?

Fill dirt is subsoil taken from beneath the top biological layer. It contains virtually no organic matter, making it structurally stable, compactable, and resistant to decomposition—ideal for foundation backfill, grading low spots, and subbase beneath slabs. Topsoil is the dark, nutrient-rich upper 2 to 8 inches containing organic matter and microbes, designed specifically for planting grass seed, sod, and garden beds.

Why do I need to add 15% to 20% for dirt compaction?

Loose dirt dumped from an excavation truck contains substantial air pockets and void spaces. When compacted with a vibratory plate compactor or naturally settled by rainfall and gravity, soil particles consolidate, reducing volume by 10% to 20%. Without a 15% compaction allowance, your finished grade will settle below design elevation.

How many square feet does a yard of dirt cover at 2, 3, or 4 inches?

One cubic yard (27 cubic feet) covers: 162 square feet at 2 inches deep, 108 square feet at 3 inches deep, 81 square feet at 4 inches deep, and 27 square feet at 12 inches deep. When factoring in a standard 15% mechanical compaction buffer, one loose yard covers approximately 70 square feet at 4 inches compacted.

Can I haul a cubic yard of dirt in a half-ton pickup truck?

No. While a pickup bed has the physical space to hold a cubic yard, one yard of fill dirt weighs 2,200 to 2,600 lbs. A standard half-ton pickup truck (such as an F-150 or Silverado 1500) has a maximum payload limit of 1,400 to 1,900 lbs including fuel and passengers. Hauling more than 0.65 cubic yards severely overloads suspension springs, brakes, and tires.