Trench Calculator
Estimate the volume of a rectangular trench for utilities, drainage or foundations.
How to Use the Trench Calculator
Enter trench length, width and depth to estimate excavation volume.
Practical Example
A trench 20 m long, 0.5 m wide and 0.8 m deep has a volume of 8 m³.
Factors That Affect the Result
Side slopes, bedding, over-excavation, soil swell, pipe clearance and uneven depth can change the actual volume.
Frequently Asked Questions
Can I use this for utility trenches?
Yes for a basic geometric estimate.
Should bedding depth be included?
Include any additional excavated depth required for bedding.
Does soil swell matter?
Yes when estimating hauled or stockpiled material.
Related Tools
Trench Volume Planning
Enter the trench length, width and depth using consistent units to estimate the amount of soil or material involved. Real trenches may widen at the top, include sloped sides or vary in depth, so a rectangular estimate can differ from field conditions. For excavation projects, include a reasonable allowance for overdig, bedding and soil expansion after removal. The result is most useful for preliminary planning, material ordering and comparing excavation scenarios before work begins.