Excavation & Backfill Calculator

Calculation type

Pit length Meter(m)

Pit width Meter(m)

Section bottom width Meter(m)

Section top width Meter(m)

Section height Meter(m)

Project length Meter(m)

Pit radius Meter(m)

Pit depth Meter(m)

Slope factor K

Backfill depth Meter(m)

Structure volume m³

Bulking factor

Excavation: -

Backfill: -

Haul-away: -

Loose haul volume: -

Slope area: -

Notes: -

Excavation & Backfill Calculator

Estimate excavation, backfill and haul volumes for rectangular pits, trapezoid sections, circular pits and combo mode. Supports slope factor K, bulking factor and slope area.

Vertical box: V = L × W × H
Sloped rectangle (prismoid): V = H/6 × [AB + ab + (A+a)(B+b)]
Cone frustum: V = πH/3 × (r² + rR + R²)
Trapezoid prism: V = (bottom + top)/2 × height × length
Loose haul ≈ solid × bulking (~1.3)

All math runs locally—estimates only.