How much does fill dirt compact when rolled?

Common fill dirt compacts and consolidates by 12% to 20% (typically 15% standard) under mechanical vibratory rolling. To achieve 100 cubic yards of final in-place compacted grade, you must order approximately 117 to 120 loose cubic yards.

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

A standard commercial tandem dump truck delivers 10 to 12 cubic yards of loose fill dirt (approx. 12 to 14 tons). Larger tri-axle dump trucks can haul 14 to 16 cubic yards (approx. 18 to 20 tons).

What is the difference between fill dirt and topsoil?

Fill dirt is subsoil taken from beneath the organic surface horizon, containing clay, sand, and rock with zero organic matter. It compacts tightly and will not decompose, making it ideal for structural building pads and hole filling. Topsoil contains high organic matter for plant growth and will decompose and settle unevenly if used as structural fill.

How thick should fill dirt be compacted per lift?

Fill dirt should be placed and compacted in horizontal lifts of no more than 6 to 8 inches loose depth. Heavy vibratory plate compactors and rollers cannot achieve proper Standard Proctor density through deeper soil layers.

Fill Dirt & Pad Grading Compaction Estimator

Calculate exact uncompacted loose fill dirt required to achieve finished compacted grade for building pads, lawn leveling, and structural berms. Accounts for mechanical rolling settlement, 6-inch compaction lifts, and tandem truckload hauls.

Measurements

US customary

Area Length

Area Width

Compacted Depth

Structural compacted backfill • 2-lift mechanical tamping • AASHTO T-99

Compaction & Hauling Settings

Soil Compaction Factor

Truck Payload Limit (Tons)

ESTIMATE READY

Loose Fill Dirt to Order

13.33 yd³

Order 13.33 loose cubic yards to yield 11.11 compacted cubic yards in-place.

Compacted in-place volume 11.11 yd³

Estimated total tonnage 16.67 Tons

Dump truckloads (14-ton tri-axle) 2 Truckloads

Recommended compaction lifts 2 Lifts (3.0″ each)

Field Guide & Technical Contents

How to Calculate Fill Dirt Compaction Manually

When dirt is dropped from a dump truck, it is aerated, fluffy, and loose. As a bulldozer, skid steer, or roller drives over it, the soil particles are compressed into the interstitial voids, reducing its physical height. Civil engineers calculate the required loose delivery volume by dividing the finished compacted volume by the inverse of the compaction settling factor.

The Master Dirt Compaction Formula:

Compacted Cubic Yards = Length (ft) × Width (ft) × (Depth (in) ÷ 12) ÷ 27
Loose Delivery Volume (yd³) = Compacted Cubic Yards ÷ (1 – Compaction Factor)
Truckloads = ⌈ Loose Delivery Volume ÷ (Truck Capacity (12 yd³)) ⌉

Worked-Out Jobsite Numerical Example

Consider raising and leveling a low, water-pooling section of property measuring 60 ft long by 30 ft wide by an average of 8 inches of finished compacted grade, using clean common fill dirt with a standard 15% compaction rate:

Convert Depth to Feet: 8 inches / 12 = 0.6667 ft.
Calculate Finished Compacted Volume: 60 ft × 30 ft × 0.6667 ft = 1,200.0 cu ft. 1,200.0 / 27 = 44.44 Compacted Cubic Yards.
Calculate Loose Delivery Volume (accounting for 15% settling): Loose Volume = 44.44 ÷ (1 – 0.15) = 44.44 ÷ 0.85 = 52.29 Loose Cubic Yards.
Determine Truckloads (12 cu yd tandem trucks): 52.29 / 12 = 4.36 rightarrow 5 Full Tandem Truckloads.
Determine Lift Schedule: At 8 inches total depth, place soil in two 4-inch lifts to ensure deep compaction penetration.

Technical Reference: Dirt Densities & Compaction Properties

Different fill classifications have distinct physical weights and consolidation behaviors:

Material Classification	Loose Density (lbs/yd³)	Compacted Density (lbs/yd³)	Compaction Loss %	Best Construction Application
Clean Common Fill Dirt	2,100 lbs	2,450 lbs	12% – 16%	Subgrade leveling, backfilling deep holes
Structural Select Fill	2,300 lbs	2,750 lbs	15% – 18%	Building pads, foundation perimeter backfill
Heavy Clay Subsoil	2,200 lbs	2,800 lbs	18% – 25%	Pond lining, water-retaining clay cores
Screened Topsoil	1,900 lbs	2,200 lbs	10% – 14%	Final 2–4 inches for sod, lawn seeding, garden beds

\n Looking for Proctor compaction densities, 6-inch lift rules & subgrade testing?\n

For complete bulk density tables, mechanical plate compaction schedules, and slope grading tolerances, review our in-depth Dirt Excavation, Trenching & Soil Swell Takeoff Guide →

\n\n

Frequently Asked Questions About Fill Dirt Calculation

Five tons of dirt equals approximately 3.7 to 4.2 cubic yards. Most municipal fill dirt weighs approximately 1.3 tons (2,600 lbs) per cubic yard when moist, which yields 3.85 cubic yards per 5 tons.

At a 2-inch leveling depth, 5 tons covers approximately 620 square feet. At a 4-inch grade depth, it covers approximately 310 square feet. At a 6-inch subbase depth, it covers approximately 205 square feet.

A loose cubic yard of standard fill dirt weighs approximately 2,000 to 2,200 pounds (1.0 to 1.1 US short tons). Once mechanically compacted and rolled, its density increases to 2,400 to 2,700 pounds (1.2 to 1.35 tons) per cubic yard.

No. Never build a structural foundation or pad on topsoil. Topsoil contains organic roots and decaying matter that gradually rot away, creating subterranean voids that cause foundation cracking and uneven settlement. Always use inorganic structural fill dirt or crushed stone.

Use the jobsite “hand squeeze test.” Grab a handful of fill dirt and squeeze it firmly into a ball. If it crumbles and will not hold a shape, it is too dry (add light water spray). If water squeezes out between your fingers or it leaves a sticky mud sheen, it is too wet. If it holds its shape and breaks cleanly into two pieces when dropped from waist height, it is at optimal moisture for maximum Proctor density.

A tri-axle dump truck typically hauls 14 to 16 cubic yards of loose dirt (approx. 18 to 20 tons), while standard tandem trucks haul 10 to 12 cubic yards.

Planning Disclaimer

Results are estimates based on the dimensions and material assumptions entered. Actual material requirements can vary due to site conditions, material density, compaction, waste, supplier specifications, and construction methods. Confirm quantities with your supplier or project professional before ordering.

Fill Dirt & Pad Grading Compaction Estimator

Measurements

How to Calculate Fill Dirt Compaction Manually

Worked-Out Jobsite Numerical Example

Technical Reference: Dirt Densities & Compaction Properties

Frequently Asked Questions About Fill Dirt Calculation

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