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Excavation Calculator — Volume & Cost
Calculate excavation volume in cubic yards and estimate removal costs. Enter length, width, and depth for trenches, basements, or foundation digs.
About This Calculator
Excavation projects require accurate volume estimates to arrange the right equipment and hauling capacity, but the math is trickier than most people expect. Soil expands when dug — a phenomenon called the swell factor — meaning 1 cubic yard of undisturbed bank soil becomes 1.25 to 1.4 cubic yards of loose material in the dump truck. Ordering too few trucks means the excavator sits idle while you wait; too many trucks means you're paying for equipment you don't need. Our excavation calculator accounts for soil swell and gives you both bank and loose volumes.
The Formula Behind This Calculator
Volume (cu yd) = Length * Width * Depth / 27 Truck loads = Volume / Truck capacity Cost = Loads * Cost per load
Understanding the math helps you verify results and make better decisions for your project.
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How to Use
- 1Enter the length and width of the area to be excavated.
- 2Specify the depth of excavation.
- 3Set the soil swell factor (25% is typical for common earth).
- 4Enter the per-yard price to estimate total excavation cost.
When to Use
- →Planning a basement, pool, or foundation excavation.
- →Estimating hauling truck loads for soil removal.
- →Budgeting excavation costs before hiring a contractor.
Tips
- ✓Clay soils can swell 30-40%, while sandy soils swell only 10-15%. Ask your contractor about local soil conditions.
- ✓Always call 811 (USA) before digging to locate underground utilities — it's free and required by law.
- ✓Add 5-10% extra depth if you need gravel base or footing below the excavation.
FAQ
What is the swell factor in excavation?
Swell factor is how much soil expands when disturbed. Bank (undisturbed) soil becomes loose when excavated. Common swell factors: sand 10-15%, clay 30-40%, rock 40-50%.
How many truck loads will my excavation need?
A standard dump truck carries about 10-14 cubic yards. Divide your loose cubic yards by the truck capacity to estimate loads. A tandem axle truck holds about 16-20 yards.
Does excavation cost include backfill?
No. Excavation, hauling, and backfill are typically priced separately. Backfill with compacted gravel can cost $15-30 per cubic yard plus delivery and compaction.
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