Earthwork volume calculation decides how much soil needs to be cut from high points and filled into low points to bring a site to design grade. Getting this number wrong before construction means budget overruns and schedule delays once machinery is already on site. This calculator uses the grid method: divide a site into equal cells, enter the existing and design elevation at each grid point, and the tool computes cut and fill volume per cell and totals them.
How the Grid Method Works
- The site is divided into equal square or rectangular cells, typically 5m to 20m depending on required precision.
- At each grid corner, existing ground level (EGL) is surveyed and the finished/design ground level (FGL) is taken from the grading plan.
- The difference (EGL minus FGL) at each point gives cut depth if positive, fill depth if negative.
- Average depth across the four corners of each cell, multiplied by cell area, gives that cell's volume.
- Summing every cell gives total site cut and fill volume.
This calculator handles a single cell for quick estimates. For a full site, this exact method is repeated across every grid cell from a topography survey, which is exactly how our quantity takeoff reports are compiled for construction and road projects. Real projects typically involve hundreds of grid points collected via DGPS or drone photogrammetry, not manual entry.
Where the Grid Point Data Actually Comes From
On real projects, EGL values are not typed in manually, they come from a topographic survey grid captured by DGPS RTK rover or drone photogrammetry, spaced according to how much elevation detail the site needs. FGL values come from the civil design drawing. Once both surfaces exist digitally, a full cut/fill report across the entire site is generated automatically rather than cell by cell.
Grid point elevation data collection in the field, the raw input behind every cut/fill report.
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