About this tool
Trench or pit volume with side slopes, structure deduction, bulking and shrinkage factors.
A_b = W·L; A_t = (W + 2s·D)·L; V = (A_b + A_t)/2·D; backfill = V − structure.
Formula: V = (A_b + A_t)/2 · D
Example: Length (m) = 20, Bottom width (m) = 1.2, Depth (m) = 1.5, Side slope (H per 1 V) = 0.5 → Excavation (m³) = 58.5, Top width (m) = 2.7.
Prismoidal mean, exact for a prismatic trench. Bulking and shrinkage are supplied by you, never assumed.
Quick steps
- Enter your values — every field shows its unit.
- Press Calculate (or Try an example to see how it works).
- Read the results and copy them if you need them elsewhere.
The calculation runs in your browser. Nothing you type is sent to 1CLIK.
FAQ
How does the Excavation & Backfill Calculator work?
A_b = W·L; A_t = (W + 2s·D)·L; V = (A_b + A_t)/2·D; backfill = V − structure.
What should I keep in mind?
Prismoidal mean, exact for a prismatic trench. Bulking and shrinkage are supplied by you, never assumed.
Is my data sent anywhere?
No. The numbers stay on your device; the page only shows the result.