Volume calculation is the computation of the volume of an excavation, fill or material stockpile. In construction, mining and infrastructure projects it forms the basis of cost, progress payment and progress tracking. Accurate volume calculation ties one of the most disputed questions between parties — “how much material was moved?” — to a measurable answer.
Why is volume calculation important?
Volume is not just a number but a means of agreement:
- Progress payment — the quantity of material moved or placed is the basis of payment.
- Progress tracking — planned volume is compared with actual.
- Stock management — the quantity of material in open-site stockpiles is determined.
- Cost control — haulage and fill costs are calculated on real volume.
The accuracy of the calculation feeds directly into the project’s cost control. That is why volume calculation must be based on measurement, not estimation.
Measurement methods
Depending on the size of the site and the accuracy required, two basic methods are used:
- Conventional survey (total station / GNSS): a numerical surface model is built from points selected across the site. On regular topography this is fast and sufficient.
- 3D laser scanning: a high-resolution surface is obtained from the point cloud. On complex, irregular or hard-to-reach stockpiles it gives a far more detailed and safer result.
In both methods the volume is computed from the difference between two surfaces: for example, the natural ground before excavation and the surface after it.
Period-to-period comparison
The most valuable use of volume calculation is comparing measurements of the same site at different times. From the surface difference between two periods, the quantity of material removed (cut) or added (fill) is derived separately.
This approach forms a solid basis for monthly progress payments, stock counts and site progress reports. When measurements are made with a consistent reference and method, comparison across periods becomes reliable.
Reporting
Volume results are presented not just as a total volume but in a way that can be checked:
- Cross-section and longitudinal-section drawings,
- Volume tables (with the cut / fill breakdown),
- Surface model and period-comparison visuals.
Thanks to these outputs, the calculation ceases to be a mere figure and becomes an auditable document. AKPRO reports its volume calculation work to this standard, from field survey or 3D scan data.