Inputs
m
m
m
%
m
m
m
H:1
Top width = Bottom width + 2 × Depth × H
%
m
m
%
%
| # | Length (m) | Width (m) | Depth (m) | |
|---|---|---|---|---|
| 1 | ||||
| 2 |
Results
| # | Type | Inputs | Waste | Volume | Notes |
|---|---|---|---|---|---|
| Total Volume | 0 | ||||
Volumes shown in m³ (primary) and yd³ (secondary).
Example Data
| # | Scenario | Inputs | Computed Volume |
|---|---|---|---|
| 1 | Spread | 4 units; L=1.5 m, W=1.5 m, D=0.6 m, Waste=5% | — |
| 2 | Trench | Length=20 m; Bottom=0.6 m; Depth=0.4 m; Batter=0.5H:1V; Waste=7.5% | — |
| 3 | Pier | 8 units; Ø=0.45 m; Depth=1.0 m; Waste=6% | — |
Formula Used
Spread / Isolated (rectangular prism)
V = n × L × B × D
V = n × L × B × D
Pier / Cylindrical
V = n × (π × d² / 4) × D
V = n × (π × d² / 4) × D
Strip / Trench (trapezoidal section with batter)
Top width Wt = Wb + 2 × D × H
Area A = (Wt + Wb) × D / 2
V = A × Length
Top width Wt = Wb + 2 × D × H
Area A = (Wt + Wb) × D / 2
V = A × Length
Stepped Footing
V = n × Σ (Li × Bi × Di) for each step i
V = n × Σ (Li × Bi × Di) for each step i
Final volumes include Waste/Overbreak: Vfinal = V × (1 + p/100). For imperial units, yd³ = ft³ / 27; for metric, 1 m³ ≈ 1.30795 yd³.
How to Use
- Pick your unit system: metric or imperial.
- Select a footing type tab and enter required dimensions.
- Optionally enable batter for trench and set H:1 ratio.
- Enter Waste/Overbreak to cover over-excavation and spillage.
- Click Calculate to preview, then Add to Table to store.
- Repeat for other footings; export totals using CSV or PDF.
Tip: Use the Stepped tab to stack rectangular tiers under column bases.
FAQs
Yes. Enable the batter switch and provide the horizontal component H per 1V. The top width is increased by 2 × Depth × H and volume uses a trapezoid cross-section.
Yes. Use the Pier/Cylindrical tab, enter diameter and depth, and set count. The volume is πd²/4 × depth times the number of piers, plus optional wastage.
When imperial is selected, inputs are in feet (or inches converted) and outputs show cubic yards primarily and cubic feet secondarily; yd³ = ft³ / 27.
Yes. The percentage multiplies the geometric volume for each item. Typical values range 3–10% depending on soil conditions, trench stability, and placement method.
Yes. Add as many rectangular steps as needed; the calculator sums L × B × D for each step, multiplies by the count, and optionally applies wastage.
Results are estimating aids. Confirm dimensions and bearing requirements with your structural drawings and engineer. Round up for truck load sizes and placement losses.