Excavation & Hauling Estimate
How This Calculator Works
Excavation projects involve more than just digging — you need to account for volume expansion, truck logistics, and hauling costs. This calculator ties it all together in one estimate.
Key Concepts
- Bank volume — The volume of dirt while it's still in the ground, before excavation.
- Expanded volume — The volume after excavation, accounting for the fluff factor (typically 35% increase).
- Fluff factor — When dirt is excavated, it expands because air pockets form between particles. The standard industry assumption is 35%.
- Round-trip hauling — The cost per mile is calculated for round trips (distance × 2) since trucks must return empty.
Tips for Accurate Estimates
For the most accurate results: measure your excavation area carefully, use the 35% default fluff factor for most soil types (clay may swell more, sand less), and get current rate quotes from local trucking companies for the cost-per-load and cost-per-mile fields.
Frequently Asked Questions
What is the fluff factor for different soil types?
Sand and gravel: 10-15%. Average soil: 30-40%. Clay: 40-60%. The default 35% works well for most mixed soil conditions.
Why does the calculator double the haul distance?
Trucks must drive to the dump site and then return empty to the excavation site. The cost per mile is applied to the full round trip distance.
How do I estimate costs if I don't know rates?
Contact local trucking companies for per-load and per-mile quotes. Typical rates range from $50-150 per truckload and $3-8 per mile depending on your area.
Can I use this for backfill projects too?
Yes — the volume calculations work the same way. For backfill, you may want to reduce the fluff factor since material being placed back in is typically compacted (set to 0% or a negative value).
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