Excavation Volume Calculator: Bank, Loose and Truck Loads
Calculate excavation volumes for construction projects. Account for soil swell factors, side slopes, and truck loads. Includes bank volume, loose volume calculations, and backfill estimates for earthwork planning.
Last updated: January 2026
Swell factor: 1.3x - soil expands when excavated
Calculate material for partial backfill after construction
Bank Volume (In-situ)
240
m³
Loose Volume (Transport)
312
m³
Truck Loads
26
@ 12 m³ each
Swell Factor
1.3x
Clay
Notes:
- Bank volume is the in-situ (undisturbed) soil volume
- Loose volume accounts for soil expansion when excavated
- Swell factors vary by soil type (15-50% typical)
- Actual volumes may vary based on site conditions
- Consider access routes when planning truck sizes
ESTIMATION NOTICE
This calculator provides APPROXIMATE QUANTITIES for budgeting and planning purposes.
Please note:
• Results include standard wastage factors but actual waste may vary based on site conditions, workmanship, and material quality.
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About This Calculator
The Excavation Volume Calculator helps contractors and quantity surveyors estimate earthwork volumes for construction projects across the UAE and Gulf. Calculate bank volumes, loose volumes after swell, and the number of truck loads required for spoil removal. Essential for accurate tender pricing, earthwork planning, and coordinating with excavation subcontractors on infrastructure, building, and civil engineering projects.
Formula
Rectangular or trench: bank volume = length × width × depth
Trapezoidal: bottom length = length − (top width − bottom width); mid area = ((length + bottom length) ÷ 2) × ((top width + bottom width) ÷ 2)
Trapezoidal bank volume = (depth ÷ 6) × (top area + bottom area + 4 × mid area)
Loose volume = bank volume × swell factor (sand 1.10, gravel 1.12, clay 1.30, sandy clay 1.25, topsoil 1.25, mixed 1.20, blasted rock 1.50)
Truck loads = loose volume ÷ truck capacity, rounded up
Backfill volume = bank volume × backfill percentage
Spoil to dispose (loose) = (bank volume − backfill ÷ 0.9) × swell factor, not less than zero
Worked example
Inputs
- Pit 10 m long × 8 m wide × 3 m deep, clay (swell factor 1.30)
- 12 m³ trucks, backfill 30% of the bank volume
Steps
- Bank volume = 10 × 8 × 3 = 240 m³
- Loose volume = 240 × 1.30 = 312 m³
- Truck loads = 312 ÷ 12 = 26
- Backfill = 240 × 0.30 = 72 m³
- Soil needed for compacted backfill = 72 ÷ 0.9 = 80 m³ bank; remaining bank soil = 240 − 80 = 160 m³
- Spoil to dispose = 160 × 1.30 = 208 m³ loose
Result: 240 m³ bank, 312 m³ loose, 26 truck loads of 12 m³, and 208 m³ (loose) of spoil to dispose.
Assumptions and limits
- Swell factors are typical single values per soil type. Actual swell varies with moisture, compaction and rock quality, so confirm against the geotechnical report.
- Truck loads assume every truck is filled to its stated capacity with loose material and no allowance is made for partial loads.
- The calculator covers volume only. It does not model groundwater, shoring or battering, working space, benching, topsoil stripping or over-excavation.
- Trapezoidal pits assume the same side slope on the length and width, with the bottom length reduced by the same amount as the width.
- The backfill spoil calculation assumes excavated soil is reused for compacted backfill at a fixed 0.9 shrinkage ratio. Imported fill is not included.
- These are planning quantities. Check the governing specification and measurement rules before using them for pricing or payment.
When to Use This Calculator
- Estimating excavation costs for tender submissions
- Calculating truck loads for spoil disposal planning
- Determining backfill quantities after foundation works
- Planning earthwork schedules for site preparation
- Verifying subcontractor excavation claims
How to Use This Calculator
Enter Excavation Dimensions
Input length, width, and depth of the excavation area in meters.
Select Soil Type
Choose the soil type; the calculator applies its swell factor (see the FAQ for the values).
Specify Side Slopes
If the sides are sloped, enter the bottom and top dimensions of the excavation.
Enter Truck Capacity
Choose the truck size (8, 12 or 20m³) used for the number of loads.
Review Results
Get bank volume, loose volume, truck loads, and backfill quantities.
Typical Scenarios in UAE & Gulf Projects
A tower basement needs a 50 m × 40 m × 12 m deep excavation in sand. The calculator gives 24,000 m³ bank volume and 26,400 m³ loose volume (10% swell for sand), which is 2,200 loads in 12 m³ trucks to an approved disposal site.
A 2 km utility trench, 2 m wide × 1.5 m deep, in mixed soil. The calculator gives 6,000 m³ bank volume and 7,200 m³ loose volume (20% swell), 600 loads of 12 m³. With 80% of the trench backfilled (4,800 m³ compacted), reusing the excavated soil takes about 5,333 bank m³, leaving about 800 loose m³ of spoil to remove.
Frequently Asked Questions
What is the swell factor for different soil types?
Swell factor (increase in volume when excavated): Sand/gravel 10-15%, ordinary soil 20-25%, clay 25-35%, rock 40-65%. The calculator uses 10% for sand, 12% for gravel, 20% for mixed soil, 25% for sandy clay and topsoil, 30% for clay and 50% for blasted rock; use the values from your soil report where available. Swell factor is crucial for accurate truck load calculations and disposal costs.
How do I calculate sloped excavation volume?
For excavations with sloped sides: V = D × [LW + (L+W)×D×S + 4/3×D²×S²], where D=depth, L=length, W=width, S=slope ratio. Example: 10 m × 10 m base, 3 m deep, 1:1 side slopes (16 m × 16 m at the top) = 300 m³ base prism + 216 m³ for the slopes = 516 m³ total, the same as the calculator's trapezoidal (prismoidal) result.
What truck sizes are commonly used in Gulf construction?
Tipper and dump truck capacities vary by supplier and by whether the load is struck or heaped. The calculator offers 8, 12 and 20m³ trucks; use the real capacity quoted by your haulier, and check site access restrictions.
Last Updated: January 2026
Standards Reference: Geometric volume formulas; swell factors are indicative, use your soil investigation report
