Last updated: July 5, 2026
Order Too Little and the Trucks Come Back—Order Too Much and You Pay to Haul It Away
A contractor prices a building pad, multiplies length by width by depth, and orders 160 cubic yards of structural fill. The trucks dump, the crew spreads and compacts, and at the end of the day the pad is still four inches short. Nobody applied a compaction factor, so the actual fill volume needed was closer to 200 yards. Two extra truckloads, a wasted day of idle equipment, and a change order the client did not expect. The math is simple—area times depth—but the number that matters is the adjusted volume after compaction, not the raw number off the calculator.
This tool takes your pad dimensions and average fill depth, applies an optional compaction multiplier, converts the result to cubic yards or cubic metres, and estimates how many dump-truck loads you need to schedule. It does not specify what type of fill to use or whether your subgrade can support it—those decisions belong to a geotechnical engineer.
Why Raw Volume Is Never the Number You Order
Soil changes volume at every stage. Excavated material swells when it lands in the truck (loose state), then shrinks when a roller compacts it into place (compacted state). The ratio between compacted volume and loose volume is the compaction factor. Ignore it and you under-order every time.
| Material | Typical factor | What it means |
|---|---|---|
| Clean fill dirt | 1.10–1.20 | Order 10–20 % more than in-place volume |
| Crushed gravel / road base | 1.15–1.25 | Angular stone packs tighter; more swell in truck |
| Sand | 1.05–1.15 | Least swell; still add 5–15 % |
| Clay / heavy soil | 1.20–1.35 | Most swell; moisture content drives the range |
| Topsoil (screened) | 1.10–1.20 | Similar to clean fill; organic content adds fluff |
Multiply your in-place volume by the factor to get the loose volume you actually order. A 178 yd³ pad with a 1.25 factor becomes 223 yd³ on the purchase order. The difference—45 yards—is three extra truckloads and roughly $900–$1,350 in material that most homeowners forget to budget.
40 × 60 Pad, 2-Foot Raise: Volume, Factor, Truckloads
Site: 40 ft × 60 ft building pad. Target raise: 2 ft of compacted structural fill. Material: crushed road base (factor 1.25). Truck capacity: 14 yd³ (tandem-axle dump).
- Raw (in-place) volume: 40 × 60 × 2 = 4,800 ft³ ÷ 27 = 177.8 yd³
- Adjusted for compaction: 177.8 × 1.25 = 222.2 yd³ loose
- Truckloads: 222.2 ÷ 14 = 15.9 → 16 loads (always round up)
- Material cost at $20/yd³: 222.2 × 20 = $4,444 delivered
Without the compaction factor the order would have been 178 yards—about 13 loads. After compaction the pad would sit 4–5 inches low and the crew would need three more loads at rush pricing. Applying the factor up front avoids the callback and keeps the schedule on track.
Four Budget-Busters People Skip in the Estimate
- Topsoil strip-and-stockpile. If the finished surface will be lawn, you need to strip 4–6 inches of topsoil, stockpile it, place structural fill underneath, then spread the topsoil back on top. That strip layer reduces the structural fill depth—but you also need equipment time and staging room for the pile. Miss this step and your landscaper ends up planting grass on road base.
- Import vs on-site reuse. Cut from a high spot on the same property costs only equipment time. Imported fill adds material cost plus trucking, which on a 20-mile haul can double the per-yard price. Run the cut-and-fill balance first. If the cut volume covers most of the fill, you save thousands on a mid-size pad.
- Moisture weight variance. Wet clay weighs 20–30 % more per yard than dry sand. Trucks are weight-limited, not just volume-limited. A 14 yd³ truck carrying saturated clay may only haul 10–11 yards before hitting legal axle loads. That turns 16 calculated loads into 20–22 actual loads—more trips, more delivery cost, more time.
- Staged fill lifts. Compaction specs usually limit each lift to 6–12 inches of loose material. A 2 ft compacted pad might require four separate lifts, each rolled to density before the next is placed. That is four passes of the roller and four rounds of waiting, not one big dump. Schedule and equipment rental cost go up accordingly.
What the Calculator Leaves Out
The tool multiplies area by depth and divides by 27 to convert cubic feet to cubic yards. If you enter a compaction factor it multiplies once more. It does not model irregular terrain, variable depths across a grid, soil suitability, lift thickness, or drainage design. Conversions use standard factors (1 yd³ = 27 ft³; 1 m³ ≈ 1.308 yd³). Fill under a structure, or fill that changes where the water goes, needs a geotechnical engineer to name the material, the compaction standard, and the testing frequency.
Need to balance cut against fill to reduce import costs? Run the mass-balance calculator. Checking whether the finished grade drains properly? Try the slope and grade calculator. Planning a retaining wall at the edge of the filled area? Use the retaining wall estimator.
The method and its sources. Raw volume is area times average depth. The amount you actually order is that figure times a compaction factor from the Standard Proctor test (ASTM D698). How much a soil bulks up or settles depends on its type, so check yours in the USDA NRCS Web Soil Survey. Cubic-yard and cubic-metre conversions use NIST Special Publication 811.