Fill Dirt Calculator

Dirt calculator

Searching for a dirt calculator leads here, on the fill-dirt tools. The four shape forms still give the neat hole. The added form, titled for a rectangular pad, takes a fluff percent and a density, then reports short tons from that density.

Leave length at 30 ft, width at 10 ft, depth at 6 in, fluff at 0, and density at 1400. Neat volume and order volume both read 5.56 yd³ · 150.00 ft³ · 4.25 m³. Short tons reads 6.55 tons. Tonnes reads 5.95 t.

Type 10 for fluff and leave density at 1400. Order volume reads 6.11 yd³ · 165.00 ft³ · 4.67 m³. Short tons reads 7.21 tons. Tonnes reads 6.54 t. Neat volume stays 5.56 yd³ · 150.00 ft³ · 4.25 m³. That extra tenth is the same allowance the settlement answer already calls about 6.1 yards.

Set fluff back to 0 and type 1600 for density. The volumes stay on the neat figures. Short tons reads 7.49 tons. Tonnes reads 6.80 t. The 1600 figure is only an example of a heavier load. It is not a measured soil.

What Is Fill Dirt?

Fill dirt is soil used to raise ground levels, fill low areas, and provide a stable base for construction and landscaping. Unlike topsoil, fill dirt contains little organic matter, making it more stable and less prone to settling over time.

It is commonly used in grading, site preparation, foundation backfill, and leveling uneven ground before installing driveways, slabs, or landscaping features.

Fill Dirt vs Topsoil vs Backfill

Common Uses of Fill Dirt

• Raising yard or property elevation
• Leveling uneven ground
• Filling holes, depressions, or excavated areas
• Preparing base for driveways, slabs, and foundations
• Rough grading before adding topsoil or landscaping layers

How Fill Dirt Volume Is Calculated

Fill dirt quantity is calculated using:

Volume = Area × Depth

The calculators above estimate the area based on your selected shape and multiply it by the fill depth. Results are provided in cubic yards, cubic feet, or cubic meters, and converted into weight using density.

Fill Dirt Density and Weight

Fill dirt typically ranges from 1,200 to 1,600 kg/m³ depending on soil type, moisture, and compaction. A default density of 1,400 kg/m³ is a common estimate for general fill calculations.

Clay-heavy soils are usually denser, while sandy soils may be lighter. Moisture content can also increase weight significantly.

Compaction and Settlement

Fill dirt should always be compacted in layers to reduce settling over time. Loose fill can shift and compress after installation, leading to uneven surfaces or structural issues.

• Place fill in layers of 6″–12″
• Compact each layer thoroughly
• Allow extra material (10–20%) for compaction loss

Grading and Drainage Considerations

Proper grading is essential when using fill dirt. The finished surface should slope away from structures to prevent water accumulation and drainage problems.

• Maintain slope away from buildings (typically 2% grade)
• Avoid trapping water in low areas
• Use drainage gravel where water movement is required

Important Tips When Using Fill Dirt

• Do not use fill dirt for planting or gardening
• Remove debris, roots, and organic material before placement
• Combine with topsoil for final surface layers if needed
• Check local soil type to ensure compatibility with your project

Common Mistakes to Avoid

• Using topsoil instead of fill dirt for structural fill
• Failing to compact layers properly
• Ignoring drainage and slope requirements
• Underestimating material needed due to settlement

FAQs

How much fill dirt do I need?

The amount depends on your project dimensions and depth. Use the calculator above to estimate total volume and weight.

Can I use fill dirt for a lawn?

Fill dirt is not suitable for growing grass. It is typically covered with topsoil before planting.

How much extra fill dirt should I order?

It is common to add 10–20% extra to account for compaction and settling after installation.

Does fill dirt settle over time?

Yes, especially if not compacted properly. Layered compaction helps reduce long-term settling.

How much fill dirt do I need for a 30 by 10 foot area?

At 6 inches, 30 × 10 × 6 ÷ 324 = 5.56 cubic yards. At 1,400 kg/m³ the order line reads 4.25 cubic meters, 6.55 short tons, 5.95 tonnes, and 300 bags of 0.5 cubic feet. Twelve inches over the same rectangle is 11.11 cubic yards and 13.11 short tons.

How many yards of fill dirt in a truck?

A small dump often carries 5 to 10 cubic yards, so the 5.56 yard example is about one small truck before the extra you add for settlement. The calculator does not know the truck. It knows the hole. Ask the hauler how many yards that truck actually holds.

How much does a yard of fill dirt weigh?

At 1,400 kg/m³ a cubic yard is 1.18 short tons, about 2,360 pounds, and 1.07 tonnes. Topsoil is often lighter and wet clay is heavier. The density section above is why 1,400 is only a start. Type the supplier’s figure when the load is weighed.

How many square feet does a yard of fill dirt cover?

One cubic yard covers 324 square feet at 1 inch, 108 at 3 inches, 54 at 6 inches, and 27 at 12 inches. The 30 by 10 foot pad is 300 square feet, so 6 inches is a little more than 5 yards, which is the 5.56 yard result.

How much fill dirt to raise a yard 4 inches?

Four inches over 30 by 10 feet is 3.70 cubic yards and 4.37 short tons at 1,400 kg/m³. A low spot that is 4 inches in the middle and nothing at the edges should use the average depth, or the order will build a pad instead of a blend.

Will 5.56 yards still be 6 inches after it settles?

Not always. The settlement section above is the reason to order more than the neat volume. 5.56 cubic yards fills the 6 inch box only if the dirt stays at that thickness. Loose dirt that compacts 10 percent needs about 6.1 yards to finish at 6 inches.

How does the dirt calculator apply fluff and density?

The dirt calculator opens at 30 ft by 10 ft by 6 in, fluff 0, and density 1400. Neat volume and order volume both read 5.56 yd³ · 150.00 ft³ · 4.25 m³. Short tons reads 6.55 tons. Tonnes reads 5.95 t. Type 10 into fluff and order volume reads 6.11 yd³ · 165.00 ft³ · 4.67 m³, short tons 7.21 tons, tonnes 6.54 t. Return fluff to 0 and set density to 1600: volumes stay on the neat line, short tons reads 7.49 tons, and tonnes reads 6.80 t.