Fill Dirt Volume Calculator
Enter fill area and depth — your fill dirt estimator updates live
Cubic Yards
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Tons—
Est. Cost—
Truck Loads—
Professional Fill Dirt Estimation Tool
Fill Dirt Calculator
Estimate fill dirt volume, cubic yards, tons, grading material coverage, and project costs instantly using our accurate fill dirt calculator designed for leveling, excavation, grading, landscaping, and construction projects.
- Accurate Dirt Volume Estimation
- Grading & Excavation Friendly
- Realtime Results
- Contractor Approved
Grading & Fill Diagram
Example Fill Dirt Projects
Load typical grading and backfill sizes, then adjust for your site.
Backyard Leveling
Low area: 30 ft x 20 ft x 4 in general fill.
- Cubic yards
- ~7.4
- Tons
- ~8.9
- Est. cost
- ~$148
Foundation Fill
Garage pad prep: 40 ft x 30 ft x 12 in structural fill.
- Cubic yards
- ~44.4
- Tons
- ~57.8
- Est. cost
- ~$1,111
Pool Backfill
Shell backfill: 25 ft x 15 ft x 18 in compactable fill.
- Cubic yards
- ~20.8
- Tons
- ~26.0
- Est. cost
- ~$500
Driveway Base Fill
Approach: 50 ft x 12 ft x 6 in clean fill.
- Cubic yards
- ~11.1
- Tons
- ~13.3
- Est. cost
- ~$222
How the Fill Dirt Calculator Works
Our fill dirt estimator treats your work area as a rectangular prism: length x width x depth, with all dimensions converted to feet before volume math. Suppliers quote and deliver fill by the cubic yard; tons help you verify truck weights and scale tickets.
( Length x Width x Depth ) / 27
= Cubic Yards x density = Tons
Why divide by 27?
One cubic yard equals 27 cubic feet (3 ft x 3 ft x 3 ft). Multiplying length, width, and depth in feet gives cubic feet; dividing by 27 converts to cubic yards so your order matches the quarry or hauler ticket.
Cubic yard calculations for grading
Example: a 20 ft x 30 ft yard low spot at 6 inches deep. Depth in feet is 6 / 12 = 0.5 ft. Volume = 20 x 30 x 0.5 = 300 cu ft. Yards = 300 / 27 = 11.11 cubic yards. A dirt calculator or grading dirt calculator does this instantly when you enter inches or meters.
Grading volume estimation
Measure at the longest points of the fill footprint. For stepped grades, split into rectangles and add volumes. Depth is the fill thickness you need after rough spread—not the height of a loose dump pile before compaction.
Soil compaction basics
Loose fill compacts under equipment and moisture. If you need a finished grade at 6 inches after compaction, you must order more loose yards. Enable the compaction factor (often 10-20%) so your fill dirt coverage calculator output matches field results.
Why fill density matters
Fill dirt averages about 1.2 tons per cubic yard, but clay runs heavier and sandy fill lighter. Weight drives truck capacity, bridge limits, and disposal fees. Our dirt-type dropdown adjusts density and typical cost per yard.
Contractor dirt estimation methods
Pros shoot grades with laser or GPS, calculate cut and fill separately, and add waste on irregular sites. They specify clean fill vs. structural fill on proposals and verify moisture at delivery. Use copy-results to paste estimates into bids or supplier texts.
Fill Dirt Depth Guide
Loose fill depth before compaction; add compaction and waste factors in the tool.
| Application | Recommended Depth | Ideal Fill Type | Est. Cu Yd / 100 sq ft |
|---|---|---|---|
| Yard Leveling | 4-8 in | General or clean fill | 1.23-2.47 yd |
| Foundation Backfill | 8-18 in (per engineer) | Structural or compactable fill | 2.47-5.56 yd |
| Driveway Base | 4-8 in under stone | Clean, compactable fill | 1.23-2.47 yd |
| Pool Fill | 12-24 in around shell | Compactable fill, lifts | 3.70-7.41 yd |
| Landscaping Projects | 4-12 in rough grade | Landscaping or general fill | 1.23-3.70 yd |
Common Fill Dirt Estimation Mistakes
- Ignoring compaction. Ordering loose yards equal to finished volume leaves low spots after plate compactor or roller passes. Always add a compaction allowance on structural and driveway fills.
- Using incorrect depth. Mixing finished grade depth with total fill height (including topsoil cap later) doubles orders. Fill depth is subgrade material only unless you are modeling one combined lift.
- Choosing the wrong fill material. Organic topsoil, large rock, or debris-filled fill does not compact reliably for loads. Use certified structural fill where engineers specify it.
- Forgetting settling allowance. Clay fills shrink and settle over time; large fills may need 5-10% extra beyond compaction. Use the waste/settling toggle on big grading jobs.
- Poor grading measurements. Guessing area on sloped yards, or using building footprint instead of actual fill footprint, causes costly shortages. A soil fill calculator is only as good as your field dimensions.
Complete Guide to Calculating and Ordering Fill Dirt
Fill dirt is the workhorse of site grading: it builds elevation, fills low spots, backfills foundations and pools, and creates stable subgrade under driveways and patios. Order too little and crews idle waiting for another truck; order too much and you pay to move piles twice. This guide explains how to calculate fill dirt volume, account for compaction, choose the right material, and use a fill dirt calculator the way excavation and landscape contractors do before they book haulers.
How to Calculate Fill Dirt for Your Project
Sketch the fill footprint as rectangles. Measure length and width at the widest points in feet (or enter meters—the tool converts). Depth is how thick the fill will be in that zone after spreading, before final compaction to target grade.
Multiply length x width x depth in feet for cubic feet. Divide by 27 for cubic yards. Multiply yards by about 1.2 for tons at typical fill density. That is the core of every fill dirt estimator and quarry quote. For a 40 ft x 25 ft area at 8 inches: depth = 0.667 ft, volume = 667 cu ft, yards = 24.7, tons about 29.6 at 1.2 tons per yard.
Grading and Leveling Basics
Establish control points with a laser level or string line. Slope away from structures—commonly 2% minimum for the first 10 feet. Fill low areas in lifts 6-8 inches thick, moisten lightly, and compact before adding the next lift. Deep fills without lifts can leave soft layers that settle later.
Strip topsoil from areas that will receive structural fill and stockpile it for finishing. Mixing topsoil into fill lifts weakens compaction. Cap plantable areas with topsoil after grade is set, using a separate volume calculation.
Fill Dirt Compaction Guide
Compaction reduces voids and increases bearing capacity. Sandy fills compact faster; clay needs moisture control to avoid pumping. Plate compactors suit trenches and small pads; vibratory rollers suit large pads. Proctor tests on commercial jobs define target density—residential work often relies on lift thickness and pass counts.
Rule of thumb: loose fill may shrink 10-20% in place. If the calculator shows 10 yards loose and you skip compaction factor, you may finish 1-2 inches low across a large pad. Enable compaction % in our tool for driveway, foundation, and pool presets.
Foundation Backfill Planning
Backfill against foundations only when walls are designed for it—often after curing and waterproofing. Use granular or engineered fill where codes require drainage away from the footing. Structural fill supports loads under slabs and garage floors; do not use unscreened debris fill in those zones.
Calculate backfill volume as the space between existing grade and new floor elevation, minus concrete volume already in place. Our foundation example loads 40 x 30 ft at 12 inches—about 44 cubic yards before adjustments. Engineers may specify imported fill and inspection—follow the plan over generic estimates.
Excavation Dirt Estimation
Cut-and-fill sites balance material on paper: cuts export or stockpile, fills import or reuse. Swell and shrink factors apply when moving native soil—excavated bank yards do not equal compacted fill yards one-to-one. Reuse suitable on-site fill when tests allow; it saves purchase and haul.
When exporting excess, calculate cut volume separately from fill needs. Haul-off is priced per load or ton. When importing, verify fill is clean (no trash, organics, or contamination) especially near structures and wells.
Landscaping Fill Projects
Residential landscaping uses fill to reshape swales, build berms, and raise patio subgrade. Landscaping fill is often general or clean fill—still compacted for anything that will carry pavers or retaining wall footings. Decorative finish comes later with topsoil and mulch.
Coordinate with gravel for drainage layers and mulch for surface beds. Fill establishes shape; gravel and topsoil finish function and appearance.
Dirt Delivery Planning
Bulk fill is sold by the cubic yard with a delivery fee. Minimums often run 5-15 yards. Ten cubic yards fill a typical residential dump body—our truck bar shows how many loads you need. Specify dump location; drivers will not spread material across the yard.
Wet fill weighs more and can rut lawns. Dry fill is easier to grade but may need controlled moisture for compaction. Schedule equipment (skid steer, loader) when the truck arrives to move piles quickly off pavement and rights-of-way.
Contractor Grading Tips
Quote fill by the yard with material type and compaction responsibility defined. Photograph irregular sites and segment calculations. Verify tickets against estimate—suppliers sometimes measure loose vs. bank yards differently.
On commercial work, tie fill estimates to survey data. On residential, walk the lot with the homeowner and agree where grade will finish. Link to this fill dirt calculator on site so change orders use numbers, not guesses.
Clean Fill vs. Structural Fill
Clean fill is free of organics, trash, and large rock—suitable for general grading and many backfills. Structural fill meets gradation and compaction standards for loads under slabs and road bases. Certified material costs more but reduces rejection and rework.
Sandy fill drains well; clay fill holds moisture and can heave if not compacted properly. Match product to drainage and load requirements. Never use fill with unknown debris near utilities or building footprints.
Fill Dirt vs. Topsoil
Fill dirt changes elevation and support; topsoil grows plants. Using topsoil as deep structural fill is expensive and unstable. Using fill as a garden growing medium fails plants. Calculate each material separately. See our topsoil calculator for lawn and bed caps after fill grade is complete.
Metric Projects
Enter dimensions in meters or centimeters; results show cubic meters and yards. One cubic yard is about 0.765 cubic meters. Adjust density if your supplier quotes metric tonnes per cubic meter instead of tons per yard.
Ready to order? Use the calculator above, explore all tools on YardsCalculator, and pair with topsoil, gravel, and concrete estimators for full site takeoffs. Accurate depth, compaction allowance, and the right fill type keep grading on budget and on schedule.
Fill Dirt Calculator FAQ
How do I calculate how much fill dirt I need?
Multiply length x width x depth in feet for cubic feet, divide by 27 for cubic yards, then multiply by about 1.2 for tons. Add compaction and waste percentages for grading and backfill. Our fill dirt calculator converts all common units automatically.
How many tons are in a cubic yard of fill dirt?
About 1.2 tons per cubic yard for average fill; clay can reach 1.35 or more and sandy fill about 1.15. Enter your supplier density or pick a dirt type in the tool.
What is fill dirt used for?
Raising grade, leveling yards, backfilling foundations and pools, filling utility trenches, and building compacted subgrade under driveways, patios, and slabs. It is not meant for planting beds without a topsoil cap.
How much fill dirt covers 100 square feet?
At 6 inches deep: about 1.85 cubic yards. At 12 inches: about 3.7 cubic yards. Depth always controls volume—not square footage alone.
What is the difference between fill dirt and topsoil?
Fill dirt is subsoil for structure and grade with little organic matter. Topsoil is the surface layer for lawns and gardens. Use fill to build grade; cap with topsoil where plants grow.
How accurate is a fill dirt calculator?
Rectangular math is exact when measurements are correct. Irregular shapes, swell/shrink on native soil, and variable compaction add variance—use compaction and waste toggles on real jobs.
How much does fill dirt cost per yard?
General fill often runs $15-$30 per cubic yard delivered in many markets; structural or certified fill costs more. Enter your local quote in the cost field.
Should I account for compaction?
Yes on any compacted lift. Add 10-20% loose yards so finished grade matches plan after roller or plate passes. Enable the compaction factor in our calculator.
What type of fill dirt is best for grading?
Clean, debris-free fill that compacts well; sandy or sandy-loam blends for drainage; clay only where moisture and compaction are controlled. Match spec on engineered jobs.
Can I calculate fill dirt in meters?
Yes. Enter length, width, and depth in meters or centimeters. Results show cubic meters and cubic yards with tons based on your selected density.