Earthwork Calculator: Free Online Cut & Fill Estimator
Use our free earthwork calculator to estimate cut and fill volumes for any grading or excavation project. Designed for contractors, civil engineers, and site supervisors, this tool computes earthwork quantities from your existing and proposed grade elevations. Enter your grid points and get instant results in cubic yards or cubic meters to plan equipment, labor, and material logistics.
How to use this calculator.
- Set up your grid. Define your survey grid with evenly spaced points across the project area. Typical spacing is 25 to 100 feet depending on terrain complexity.
- Enter existing elevations. Input the current ground elevations at each grid point from your topographic survey or site measurements.
- Enter proposed elevations. Input the design elevations showing the finished grade at each grid point.
- Calculate cut and fill. Click Calculate to see the net earthwork volumes. Cut is material to be removed, fill is material to be imported.
- Review the mass balance. A well-planned site aims for balanced cut and fill to minimize off-haul and import costs.
How do you calculate earthwork volumes with swell and compaction?
Earthwork quantities are calculated using the grid method, also known as the borrow-pit method. Each grid cell is a prism, and the average cut or fill depth at each corner determines the volume.
Volume per cell (cu yd) = A × (C1 + C2 + C3 + C4) ÷ (4 × 27)
Where:
- A: Area of the grid cell in square feet (grid spacing squared for square grids).
- C1 through C4: Cut or fill depth at each corner of the cell, in feet. Positive values indicate cut (removal), negative values indicate fill (addition).
- 27: Conversion factor from cubic feet to cubic yards.
For non-square grids or irregular boundaries, the average-end-area method may be used, calculating volume as the average cross-sectional area multiplied by the distance between sections.
Example calculation.
Let's calculate the earthwork for a 50 ft × 50 ft building pad.
Scenario: A square lot with a 50 ft grid spacing. The existing and proposed elevations at the four corners are measured.
- Grid area: 50 ft × 50 ft = 2,500 sq ft per cell
- Corner cut depths: C1 = 2.1 ft, C2 = 1.8 ft, C3 = 0.9 ft, C4 = 1.6 ft
- Average depth: (2.1 + 1.8 + 0.9 + 1.6) ÷ 4 = 1.6 ft
- Volume in cubic feet: 2,500 sq ft × 1.6 ft = 4,000 cu ft
- Convert to cubic yards: 4,000 ÷ 27 = 148.15 cu yd of cut
Result: This building pad requires approximately148 cubic yards of material to be cut and removed, or stockpiled for fill elsewhere on site.
Tips from the field.
- Shrink and swell factors matter. Excavated soil typically swells 15–35% depending on soil type. Compacted fill shrinks 10–20%. Apply these factors for accurate trucking estimates.
- Topsoil should be stripped first. Strip and stockpile topsoil separately before cut-and-fill operations. Include this in your earthwork quantities as a separate line item.
- Use a smaller grid for complex terrain. For sites with rapidly changing grades, use 25-foot or even 10-foot grid spacing for better accuracy.
- Account for unsuitable material. If the site has peat, muck, or contaminated soil, over-excavation and replacement volumes must be added to your earthwork estimate.
- Always mark utilities before digging. Call 811 before any excavation. Hitting a utility line can cost tens of thousands in repairs and create life-threatening hazards.
Disclaimer: This calculator provides estimates for planning purposes only. Actual earthwork quantities depend on site-specific soil conditions, compaction requirements, shrink/swell factors, and construction methods. For grading plans, structural fill specifications, or mass excavation designs, consult a licensed civil engineer or professional surveyor. PavementCalculator.com assumes no liability for earthwork volume discrepancies or cost overruns.
Cost, price, and density figures on this page reflect approximate U.S. averages as of August 2026 and vary by region, supplier, and material availability.
Frequently asked questions.
What is a swell factor in earthwork?
A swell factor accounts for the increase in volume when soil is excavated. In-place (bank) soil expands when dug up and loaded into trucks (loose volume). Typical swell factors: Sand/gravel: 10-15% (1 cu yd bank = 1.10-1.15 cu yd loose). Common earth: 25% (1 yd bank = 1.25 yd loose). Clay: 30-40% (1 yd bank = 1.30-1.40 yd loose). Rock (blasted): 50-60% (1 yd bank = 1.50-1.60 yd loose). This means a 10-yd hole produces 12.5-14 loose cubic yards to haul away.
What is a shrink factor in earthwork?
A shrink factor accounts for the decrease in volume when soil is compacted. Loose fill dirt compresses when spread and compacted. Typical shrink factors: Sand/gravel: 10-15% (need 1.10-1.15 loose cu yd per 1.0 compacted cu yd). Common earth: 15-25%. Clay: 25-35%. This means to fill a 100 cu yd hole with compacted clay, you need 125-135 loose cubic yards of fill material. The shrink factor is critical for accurate fill quantity estimates.
How do I estimate earthwork quantities?
Use the average end area method: Calculate the cross-sectional area of cut/fill at each station, average adjacent stations, and multiply by the distance between them. For simple rectangular excavations: Length × Width × Depth ÷ 27 = cubic yards (bank). Then apply swell/shrink factors. Modern earthwork estimation uses 3D modeling (drone surveys + software), but the end area method remains the standard for estimating and bidding.
How much does earthwork cost?
Excavation: $3-$8 per cubic yard (machine excavation, no haul). Hauling: $5-$15 per cubic yard (depends on distance). Fill placement and compaction: $5-$12 per cubic yard. Site grading: $0.50-$2.00 per square foot. Complete site prep (clearing, grubbing, grading): $1,500-$5,000 per acre. Earthwork costs are highly variable based on soil type, site access, haul distance, and local disposal fees. Get multiple quotes for any significant earthwork.
How do I balance cut and fill on a site?
Site balancing (cut = fill) minimizes import and export costs. Key steps: (1) Survey existing grades. (2) Design proposed grades. (3) Calculate cut and fill volumes by comparing existing vs proposed. (4) Adjust the proposed grade up or down until cut ≈ fill (considering shrink/swell). (5) Aim for cut = fill × 1.1-1.3 (to account for shrink). The ideal balanced site generates zero import/export: all excavated material is reused on site. Software like Civil 3D or Carlson automates this calculation.
What is the difference between cut and fill?
Cut is the excavation of soil to lower the existing grade to the proposed grade. Fill is the addition of soil to raise the existing grade. A balanced site has roughly equal cut and fill volumes, minimizing the need to export or import material.
How accurate is the grid method for earthwork estimation?
The grid method is accurate to within 5–10% when using appropriate grid spacing for the terrain. For high-precision work on large sites, surveyors may use the triangular irregular network (TIN) method or drone-based photogrammetry for accuracy within 1–3%.
What is a typical swell factor for common soils?
Common swell factors: sand and gravel 10–15%, ordinary earth 20–25%, clay 30–40%, and rock (blasted) 50–60%. Always consult your project's geotechnical report for site-specific values.
How much does earthwork cost per cubic yard?
Earthwork excavation typically costs $3–$8 per cubic yard for bulk cut in favorable conditions. Hauling adds $0.25–$1.00 per cubic yard per mile. Compacted structural fill costs $10–$25 per cubic yard including material, placement, and compaction.
Do I need a geotechnical report before earthwork begins?
Yes. A geotechnical report identifies soil types, groundwater conditions, rock elevations, and compaction requirements. Without it, earthwork estimates are essentially guesses, and you risk significant cost overruns during unexpected soil conditions.