How to calculate fill dirt
Example: raising a 20 ft × 30 ft area by 6 inches needs 600 × 6 ÷ 12 = 300 cubic feet = 11.1 cubic yards, plus 15% for compaction ≈ 12.8 cubic yards — about two small dump-truck loads.
Why add extra for compaction?
Loose fill delivered by truck settles and compacts once it is spread, rolled and rained on — typically 10–25%. The calculator adds 15% by default; use more for deep fills that you will compact in layers.
Fill dirt vs. topsoil
Fill dirt is subsoil with little organic matter: cheap, stable and good for filling holes, raising grade and building up areas. It doesn't grow grass well, so finish the top 4–6 inches with topsoil.
How many truckloads?
A standard dump truck carries about 10–14 cubic yards; small trucks carry 5–6. The calculator shows truckloads at about 10 yd³ each — ask your hauler for their exact capacity.
Frequently asked questions
How much does a cubic yard of fill dirt weigh?
Roughly 2,000–2,600 lb (1–1.3 tons), more when wet or clay-heavy.
How much area does a yard of fill dirt cover?
About 81 sq ft at 4 inches deep, 54 sq ft at 6 inches and 27 sq ft at 12 inches.
How many yards are in a dump truck?
Typically 10–14 cubic yards for a standard tandem dump truck, and 5–6 for a small single-axle truck.
Can I plant grass directly in fill dirt?
It's better to cap fill with 4–6 inches of topsoil — fill has little organic matter.
Related calculators
These figures are estimates for planning only. Material weights and coverage vary by supplier, moisture and compaction. Always confirm quantities and prices with your supplier before ordering. See our terms & disclaimer.