Excavation Volume Calculator

About the Excavation Volume Calculator

Whether you're digging a foundation, trenching for utilities, or excavating a swimming pool, knowing the exact volume of earth to be removed is critical. The excavation volume calculator converts your length, width, and depth measurements into cubic yards — the standard unit used by excavation contractors and hauling companies to price removal.

Accurate volume estimation prevents costly surprises. Underestimate and you'll need extra truck loads at premium rates. Overestimate and you'll pay for hauling capacity you don't use. This calculator also factors in swell — the natural expansion of soil when it's disturbed — so your hauling estimate reflects the actual volume that needs to leave the site.

From small residential digs to large commercial excavations, This calculator gives contractors, engineers, and homeowners the numbers they need to plan budgets, schedule trucks, and manage material flow.

When This Page Helps

Excavation is often the most expensive part of site preparation. Every cubic yard removed must be loaded, hauled, and dumped, with each step carrying its own cost. This calculator gives you the in-place volume plus the swelled volume so you can get accurate trucking quotes and avoid paying for wasted trips.

How to Use the Inputs

1. Measure the length of the excavation in feet.
2. Measure the width of the excavation in feet.
3. Enter the average depth in feet.
4. Optionally adjust the swell factor for your soil type (1.2–1.5 typical).
5. Review the in-place volume in cubic yards.
6. Use the swelled volume for hauling and truck estimates.

Example Calculation

Tips & Best Practices

• Measure depth at multiple points and use the average for irregular terrain.
• Clay soils swell 30–40% while sandy soils swell only 10–20%.
• Add 5–10% to your estimate for over-dig and bank sloughing.
• Record the swell factor your soil engineer recommends for the most accurate hauling estimate.
• Check local dump fees per cubic yard — they vary widely by region and material type.
• Keep topsoil separate from subsoil if you plan to reuse it for landscaping.

Understanding Excavation Volume

Excavation volume is the total amount of earth that must be removed from a site. It's measured in cubic yards (CY) and determines how many trucks, how much time, and what equipment you'll need. The basic calculation multiplies length × width × depth, but real-world projects require adjustments for swell, over-dig, and irregular shapes.

Swell Factors by Soil Type

Different soils expand different amounts when excavated. Sand and gravel swell 10–20%, loam 20–30%, clay 30–40%, and rock 40–70%. Using the right swell factor ensures your hauling estimate matches the actual volume headed off-site.

Planning Your Excavation

Before digging, call 811 to locate underground utilities. Review your site plan for setbacks, easements, and stormwater requirements. Establish a clear haul route and identify the disposal site. For large projects, coordinate truck scheduling to avoid idle time and keep the excavator productive.

Cost-Saving Tips

Balance cut and fill on-site whenever possible to minimize off-site hauling. Stockpile usable topsoil for landscaping. Get multiple quotes from haulers. Schedule excavation during dry weather to avoid muddy conditions that slow production and increase costs.

Frequently Asked Questions

• What is a swell factor in excavation?

  When soil is dug up, it loosens and expands. The swell factor represents this increase in volume. Clay may swell 30–40% (factor of 1.3–1.4), while sand swells only 10–20% (factor of 1.1–1.2). You need the swelled volume to estimate the number of trucks needed for hauling.

• How many cubic yards fit in a dump truck?

  A standard single-axle dump truck holds 10–12 CY. A tandem-axle truck holds 14–16 CY. Larger tri-axle or quad-axle trucks can carry 18–22 CY. Actual capacity depends on material weight and local axle-weight limits.

• How do I convert cubic feet to cubic yards?

  Divide cubic feet by 27. One cubic yard equals 3 ft × 3 ft × 3 ft = 27 cubic feet. For example, 540 ft³ ÷ 27 = 20 yd³.

• What does excavation typically cost?

  Excavation costs $3–$12 per cubic yard depending on soil type, depth, access, and disposal fees. Rock excavation can run $20–$50+ per cubic yard. Always get site-specific quotes from local contractors.

• Should I include topsoil in my excavation volume?

  Yes, if you're removing topsoil as part of the dig. However, many builders strip topsoil first and stockpile it on-site for later use in landscaping. Account for it separately from the subsoil excavation.

• How accurate does my excavation estimate need to be?

  For bidding purposes, aim for ±10%. For ordering trucks, use the swelled volume and round up to ensure you have enough capacity. It's always cheaper to have one extra truck on standby than to recall a fleet.

• What is bank cubic yards vs. loose cubic yards?

  Bank cubic yards measure soil in its undisturbed state. Loose cubic yards measure the same soil after excavation, when it has expanded due to swell. Hauling estimates always use loose cubic yards.

• Can I use this for trench excavation?

  Yes. Enter the trench length, average width, and depth. For trenches with sloped sides, use the average width (top width + bottom width) ÷ 2 for best accuracy.