Bank Cubic Yards vs Loose Cubic Yards
The single biggest source of earthwork estimating errors is confusing Bank Cubic Yards (BCY) with Loose Cubic Yards (LCY). They are not the same. In fact, 1 BCY ≠ 1 LCY — and treating them as equal will under-order trucks by 20% to 40%.
BCY Bank Cubic Yards: Soil in its natural, undisturbed state before excavation. All contract plans, cross-sections, and bid quantities are measured in BCY.
LCY Loose Cubic Yards: Soil after excavation. Digging fractures the soil structure and introduces air voids, causing volume to expand (swell). Dump trucks, landfills, and haulers charge by LCY.
CCY Compacted Cubic Yards: Soil after being placed and rolled as structural fill. Compacted volume is usually less than the original bank volume.
Formula: Bank → Loose Conversion
Loose Volume (LCY) = Bank Volume (BCY) × (1 + Swell %)
Example: 100 BCY of medium clay at 30% swell becomes 100 × 1.30 = 130 LCY — a 30% increase in required truck capacity.
Soil Swell Factor Chart by Material
| Material |
Bank Density (lb/yd³) |
Loose Density (lb/yd³) |
Swell Factor |
Loose Multiplier |
| Clean Sand & Gravel | 3,000 | 2,700 | 10 – 15% | 1.10 – 1.15 |
| Common Topsoil / Loam | 2,800 | 2,250 | 20 – 25% | 1.20 – 1.25 |
| Medium Clay | 3,000 | 2,350 | 25 – 35% | 1.25 – 1.35 |
| Heavy Stiff Clay | 3,200 | 2,400 | 35 – 40% | 1.35 – 1.40 |
| Blasted Rock | 4,400 | 2,750 | 50 – 65% | 1.50 – 1.65 |
⚠️ Dirt Bulking Factor Calculator Tip: Use the interactive swell factor field above to enter your own percentage. Common defaults: 15% sand, 25% clay, 60% rock. When in doubt, use the higher end of the range — it is far cheaper to have a spare truckload of capacity than to leave soil on site.
Compacted Cubic Yards (Earthwork Conversion)
When excavated soil is reused as backfill, it is placed and compacted. Compaction removes air voids, so the compacted volume is smaller than the bank volume. This is critical for cut-and-fill balancing:
Compacted Volume (CCY) = Bank Volume (BCY) × (1 − Shrinkage %)
If a project requires 500 CCY of structural fill, and the site soil shrinks 15% when compacted, you need 500 ÷ 0.85 = 588 BCY of cut material.
Geometry & Excavation Type Takeoff Formulas
Different earthwork jobs require different geometry. A rectangular pit uses one formula. A sloped foundation uses another. A utility trench uses a third. Using the wrong formula is the second-biggest source of takeoff error.
1. Rectangular / Box Cut (Vertical Shored Walls)
Volume (ft³) = Length (ft) × Width (ft) × Depth (ft)
Volume (BCY) = Volume (ft³) ÷ 27
2. Trench Excavation Volume Calculator (Linear Cuts)
Used for utility trenches, wall footings, and drainage runs. Always measure along the trench centerline to avoid double-counting corner overlaps.
Vertical trench: Volume (ft³) = Length × Width × Depth
Sloped trench: Volume (ft³) = [(W_top + W_bot) ÷ 2] × Depth × Length
Worked example: A 150 ft drainage trench, 2 ft wide, 4 ft deep, vertical walls:
Volume = 150 × 2 × 4 = 1,200 ft³ = 44.44 BCY = 33.98 m³
3. Average End Area Formula (Roads, Rail, Long Alignments)
For linear projects where the cross-sectional cut area changes along the alignment:
Volume (ft³) = [(A₁ + A₂) ÷ 2] × L
Where A₁ and A₂ are the cut cross-sectional areas at two consecutive stations, and L is the distance between them.
4. Sloped Excavation — Prismoidal Formula
For deep excavations with sloped side walls (OSHA layback), the shape is a truncated pyramid (frustum), not a box. Using the rectangular formula will under-estimate volume by 30–50%.
Volume (ft³) = (L ÷ 6) × (A_top + 4A_mid + A_bot)
Where:
- A_top = top surface area (includes layback slope allowance)
- A_bot = bottom base area (structural footprint + working space)
- A_mid = area at mid-depth (D ÷ 2)
- L = vertical depth (h)
5. Cut and Fill Quantity Takeoff
A cut-and-fill takeoff balances the volume of soil removed (cut) against the volume needed to build up low areas (fill). When cut > fill, excess soil must be hauled off. When fill > cut, soil must be imported. On-site balancing avoids haul-off costs entirely — the goal of every earthwork estimator.
Rule of thumb: On a balanced site, order 10% more than the net fill requirement. Real soils never compact to theoretical density, and wet weather quickly changes site productivity.
6. Basement Excavation Depth and Slope Layout
For a basement cut, the geometry is not just the building footprint. You must add:
- Working space: 2 ft minimum around the concrete wall for formwork, waterproofing, and drain tile installation.
- OSHA slope layback: Based on soil type (see next section).
- Access ramp: Requires a ramp cut with a maximum grade of about 15% (1 : 6.67) for equipment.
- Footing depth: Add the thickness of the footing and any mud mat below the basement slab elevation.
Equipment, Haulage & Truckload Logistics
Volume calculations only matter if the soil can actually be moved. Converting BCY and LCY into truckload counts and haul costs is what turns a math problem into a bid.
How Many Dump Truck Loads Per Cubic Yard?
Divide the total loose volume by the truck's capacity:
Required Truckloads = Total Loose Volume (LCY) ÷ Truck Capacity (LCY)
| Truck Type |
Volume Capacity (LCY) |
Weight Capacity (Short Tons) |
Typical Use |
| Single-Axle Dump Truck | 6 – 8 LCY | 8 – 10 tons | Tight sites, residential |
| Tandem-Axle Dump Truck | 12 – 14 LCY | 14 – 16 tons | Standard hauling |
| Tri-Axle Dump Truck | 16 – 20 LCY | 20 – 22 tons | Large earthwork projects |
| Transfer Trailer | 22 – 28 LCY | 22 – 26 tons | Long-haul, high-volume |
Soil Weight Calculator: Tons to Cubic Yards
Dump trucks are also limited by gross vehicle weight. To verify a load is legal:
Weight (tons) = Loose Volume (LCY) × Loose Density (lb/yd³) ÷ 2,000
Example: A 14 LCY tandem load of wet clay at 2,500 lb/yd³ = 14 × 2,500 ÷ 2,000 = 17.5 tons — over the legal 16-ton limit. The hauler must reduce the load to about 12.8 LCY.
Earthwork Haul-Off Cost Calculator
Disposal costs combine three components:
Total Haul-Off Cost = Excavation + Trucking + Tipping Fee
Excavation: $2.50 – $6.00 per BCY
Trucking: $90 – $150 per hour (or $6 – $15 per LCY-mile)
Tipping: $10 – $35 per ton (clean fill)
$50+ per ton (contaminated soil or rock)
Quick estimate: For clean clay spoil in a typical metro area, plan on $25 – $45 per LCY all-in (dig, load, haul, tip).
Code & Standard Specifications for Excavation
Excavation safety and measurement are governed by national standards. Estimators who quote projects internationally must know both US (OSHA) and Indian (IS) frameworks.
OSHA Soil Type Sloped Excavation Requirements
Per OSHA 29 CFR 1926 Subpart P Appendix B, any un-shored excavation deeper than 5 feet must be sloped, benched, or shored. The required slope depends on soil classification:
| OSHA Soil Type |
Unconfined Compressive Strength (qu) |
Description |
Max Slope (H : V) |
Approx. Angle |
| Stable Rock | N/A | Solid mineral matter, intact | Vertical | 90° |
| Type A | ≥ 1.5 tsf | Stiff clay, silty clay, clay loam | 0.75 : 1 | 53° |
| Type B | 0.5 – 1.5 tsf | Medium clay, silt, sandy loam, angular gravel | 1 : 1 | 45° |
| Type C | ≤ 0.5 tsf | Sand, gravel, submerged soil, seeping water | 1.5 : 1 | 34° |
⚠️ Slope Ratio Rule: A 10-foot-deep Type B cut requires a horizontal layback of 10 feet on each side of the cut base. That converts a 30 ft × 40 ft rectangular cut into a 50 ft × 60 ft top opening — nearly three times the volume of a vertical-walled assumption.
IS 3764 Excavation Calculation Method (India)
IS 3764:1992 — Code of Safety for Excavation Work governs excavation safety in India. For measurement and takeoff, the standard IS 1200 (Part 27) method applies:
- Excavation is measured in cubic meters (m³), in its original (bank) position.
- Working space of 30 cm minimum is typically added around footing edges unless specified otherwise.
- Excavation for foundation is measured up to the bottom of the footing or as specified in the BOQ.
- Side slope for deep excavations is measured separately and included in the total volume.
- Unit weight of common soils (for tonnage): sand ≈ 1,600 kg/m³, clay ≈ 1,900 kg/m³, rock ≈ 2,500 kg/m³.
Bill of Quantities (BOQ) Earthwork Section Format
Commercial estimators output data in a standard BOQ format. A typical earthwork BOQ line includes:
| Item |
Description |
Unit |
Quantity |
Rate |
Amount |
| 1.1 | Site clearance and topsoil stripping (150 mm depth) | m³ | — | — | — |
| 1.2 | Bulk excavation in ordinary soil up to 3 m depth (bank volume) | m³ | — | — | — |
| 1.3 | Excavation in hard clay / dense soil up to 5 m depth | m³ | — | — | — |
| 1.4 | Excavation in rock (blasting / chiseling) | m³ | — | — | — |
| 1.5 | Backfilling in foundation trenches with approved excavated soil, compacted in 200 mm layers | m³ | — | — | — |
| 1.6 | Disposal of surplus excavated soil off-site (lead up to 5 km) | m³ | — | — | — |
BOQ Note: Line 1.2 is measured in BCY-equivalent bank volume (m³). Line 1.6 (disposal) is measured in LCY-equivalent loose volume. Always add the swell factor to the disposal line — never to the excavation line.
Google's Do / Know / Visit Intent Framework for Excavation
Google's Search Quality Rater Guidelines categorize queries into three action states. Matching your page structure to these states captures both featured snippets and full-funnel users.
🧠 Know-Simple (Instant Answer)
User wants one fact or a standard unit conversion.
- 1 cubic yard of concrete in cubic feet
- Density of compacted asphalt t/m³
- Standard metal stud length
- 1 CY of soil in tons
Target: Featured snippets, quick unit tables, Key Metrics Box.
🛠️ Do / Action-Oriented
User wants to complete a task or build something now.
- Calculate retaining wall blocks needed
- Convert square yards to tons for asphalt
- Estimate steel studs for wall framing
- Calculate excavation truckloads
Target: Interactive calculators, step-by-step tools, downloadable summaries.
📍 Visit-in-Person (Local)
User needs a physical resource or local supplier.
- Building material supplier near me
- Ready-mix concrete delivery near me
- Asphalt paving contractor cost per sq ft
- Excavation contractor near me
Target: Local resource boxes, contractor links, regional pricing.
Local Excavation Resources & Contractor Pricing
Once you have your takeoff numbers, the next step is sourcing the material, equipment, or contractor. These resources connect your estimate to local suppliers and service providers.
📍 Find Local Excavation & Hauling Services
Your volume estimate is now ready. Use these typical local pricing benchmarks when requesting quotes:
🚜 Excavation Contractor
Typical rate: $2.50 – $6.00 per BCY dug, or $90 – $150 per hour for machine + operator.
🚛 Dump Truck Hauling
Typical rate: $90 – $150 per hour per truck, or $6 – $15 per LCY-mile for long hauls.
🪨 Clean Fill / Topsoil Supplier
Typical rate: $15 – $35 per ton delivered, depending on material type and haul distance.
🏗️ Landfill / Transfer Station
Typical tipping fee: $10 – $35 per ton for clean fill; $50+ per ton for rock or contaminated soil.
Pro tip: Always call 811 (or your regional utility locator) before excavation to mark underground utilities. Striking a buried gas or fiber line can cost $10,000+ in repairs and cause serious safety hazards.
Regional Pricing Notes
- Northeast US / UK: Higher labor rates ($5–$8 per BCY) and tighter site access add 20–40% to base costs.
- Southeast US / South Asia: Lower machine rates ($2.50–$4 per BCY) but higher haul distances in rural areas.
- Urban sites: Add a 15–25% premium for traffic control, restricted working hours, and spoil staging limitations.
Excavation Key Metrics (Quick Reference)
Instant answers to the most common Know-Simple excavation queries:
1.25–1.35
Typical clay swell factor
12–14
LCY per tandem dump truck
1.3–1.5
tons per CY of soil
2 ft
Min. working space offset
Instant Unit Conversions (Know-Simple)
| Question | Answer |
|---|
| 1 cubic yard in cubic feet? | 27 ft³ |
| 1 cubic meter in cubic yards? | 1.30795 CY |
| 1 CY of soil in tons (average)? | 1.0 – 1.5 tons |
| 1 dump truck load in cubic yards? | 10 – 20 CY (varies by truck type) |
| Standard concrete density? | 2,400 kg/m³ (150 lb/ft³) |
| Standard asphalt density? | 2,300 kg/m³ (145 lb/ft³) |
Search Intent → Content Mapping Matrix
Every section of this page is designed to capture a specific search intent category. This matrix shows how the structure maps to user mindsets.
| Intent Category |
User Goal |
Best Page Element |
| Know-Simple |
Quick reference or single unit conversion |
Key Metrics Box (above), soil density tables, conversion tables |
| Commercial Evaluation |
Compare options, materials, or methods |
Side-by-side comparison tables (BCY vs LCY vs CCY) |
| Specifier / Code |
Engineering and building code compliance |
OSHA soil type table, IS 3764 section, BOQ format |
| Field Utility |
Fast site verification on mobile |
Swell factor chart, truckload table, soil density guide |
| Action / Execution |
Instant calculation and takeoff creation |
Interactive calculator with printable results |
| Visit-in-Person (Local) |
Find suppliers, contractors, or disposal sites |
Local Resources Box with pricing benchmarks |
| Mathematical / Formula |
Underlying math for spreadsheets |
Formula blocks (rectangular, trench, prismoidal) |
Why this matters: A page optimized only for one intent (e.g., "calculate excavation volume") captures one narrow slice of search. By covering Know-Simple, Do, Visit, Commercial, Specifier, Field, and Mathematical intents, this page becomes a complete topical authority hub — earning more featured snippets, more internal link equity, and more long-tail traffic.
Excavation Calculator: Complete Volume & Truckload Guide
This excavation calculator helps you estimate the volume of material to be excavated, its weight, and the number of truckloads required for removal. Enter your dimensions, soil type, and truck capacity — get results in seconds.
⛏️ Quick Formula: Excavation Volume
Volume (cy) = Length (ft) × Width (ft) × Depth (ft) ÷ 27
Example: 20 ft × 10 ft × 4 ft = 800 cu ft ÷ 27 = 29.6 cy. With 15% swell = 34.0 cy loose. At 3,000 lbs/cy = 44.4 tons.
How to Calculate Excavation Volume
The calculation for excavation volume is straightforward:
- Step 1: Calculate cubic feet: Length × Width × Depth
- Step 2: Convert to cubic yards: Cubic feet ÷ 27
- Step 3: Apply swell factor for loose volume: In-place volume × (1 + Swell %)
- Step 4: Calculate weight: Volume × Soil Density
- Step 5: Calculate truckloads: Loose volume ÷ Truck Capacity
Soil Types and Their Densities
Different soil types have different weights per cubic yard. Using the correct density ensures accurate weight estimates:
| Soil Type | Density (lbs/cy) | Density (tons/cy) | Typical Use |
|---|
| Sand | 2,700 | 1.35 | Beach, desert, foundation fill |
| Sandy Loam | 3,000 | 1.50 | Gardening, general excavation |
| Clay | 3,200 | 1.60 | Foundation, pond lining |
| Gravel | 3,400 | 1.70 | Driveways, base material |
| Rock | 3,800 | 1.90 | Blasting, heavy excavation |
Swell Factor Explained
When soil is excavated, it expands (swells) because of increased air voids. This is important for trucking calculations:
- Sand: 8-12% swell
- Sandy Loam: 12-18% swell
- Clay: 15-25% swell
- Gravel: 10-15% swell
- Rock: 20-30% swell
Real-World Excavation Examples
- Foundation (20' × 30' × 4'): 2,400 cu ft ÷ 27 = 88.9 cy × 1.15 = 102.2 cy loose × 3,000 lbs = 153.3 tons → 11 trucks (10cy)
- Basement (30' × 40' × 8'): 9,600 cu ft ÷ 27 = 355.6 cy × 1.15 = 409 cy loose × 3,200 lbs = 654 tons → 41 trucks (10cy)
- Swimming pool (20' × 40' × 6'): 4,800 cu ft ÷ 27 = 177.8 cy × 1.15 = 204.4 cy loose × 3,000 lbs = 306.6 tons → 21 trucks (10cy)
- Commercial building (100' × 60' × 10'): 60,000 cu ft ÷ 27 = 2,222 cy × 1.15 = 2,555 cy loose × 3,200 lbs = 4,088 tons → 256 trucks (10cy)
📋 Real Project: Residential Foundation Excavation
Project: Residential foundation, Austin, TX | Size: 40' × 50' × 5' | Soil: Clay (3,200 lbs/cy)
📐 Calculation:
Volume: 40 × 50 × 5 = 10,000 cu ft ÷ 27 = 370.4 cy
Swell (18%): 370.4 × 1.18 = 437.1 cy loose
Weight: 370.4 × 3,200 = 1,185,280 lbs ÷ 2000 = 592.6 tons
Truckloads (12cy): 437.1 ÷ 12 = 37 loads
5 Excavation Estimation Mistakes
- Forgetting to convert to cubic yards: Divide cubic feet by 27
- Not accounting for swell: Loose volume is always greater than in-place
- Using wrong soil density: Different soils weigh different amounts
- Ignoring truck capacity: Different trucks hold different volumes
- Underestimating depth: Measure depth accurately at multiple points
Frequently Asked Questions
How do I calculate excavation volume?➕
Volume = Length × Width × Depth. For cubic yards, divide by 27. For loose volume, multiply by (1 + swell factor).
What is the difference between bank cubic yards and loose cubic yards?➕
Bank cubic yards (BCY) measure soil in its natural, undisturbed state. Loose cubic yards (LCY) measure the expanded volume after excavation because digging introduces air voids. 1 BCY of clay typically becomes 1.25 to 1.35 LCY.
What is swell factor in excavation?➕
Swell factor is the percentage increase in volume when soil is excavated. It accounts for the soil expanding due to air voids. Typical swell factors range from 8% (sand) to 30% (rock).
How many tons of dirt are in a cubic yard?➕
It depends on the soil type. Sand: 1.35 tons/cy, Sandy Loam: 1.5 tons/cy, Clay: 1.6 tons/cy, Gravel: 1.7 tons/cy, Rock: 1.9 tons/cy.
How many dump truck loads per cubic yard?➕
Divide loose volume by truck capacity. A tandem dump truck hauls 12-14 LCY, a tri-axle hauls 16-20 LCY. A 100 LCY job needs about 8 tandem loads or 5 tri-axle loads.
What is the formula for trench excavation volume?➕
Vertical trench: Volume = Length × Width × Depth. Sloped trench: Volume = [(W_top + W_bot) ÷ 2] × Depth × Length. Measure along the trench centerline to avoid double-counting corners.
What is the OSHA soil type sloped excavation requirement?➕
OSHA 29 CFR 1926 Subpart P requires: Type A soil slope 0.75:1, Type B slope 1:1, Type C slope 1.5:1. These are maximum allowable slopes for un-shored excavations deeper than 5 feet.
How do you calculate excavation cost?➕
Excavation cost = Volume × Cost per cubic yard + Equipment + Labor + Disposal. Typical rates: $2.50-$6.00 per BCY for excavation, $10-$35 per ton for landfill tipping fees, and $90-$150 per hour for trucking.
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