Inputs
Add rows for each shape. Volumes update live.
Common: 5–10% for irregular pours.
For ordering. Rounds after waste added.
Typical: 8–10 yd³ per truck.
$
Used for cost estimate only.
Normal weight ≈ 145–150 lb/ft³.
Example Data Table
Reference example for common pours. Use "Fill Example" to auto-populate rows.
| # | Shape | Dimensions | Units | Qty | Approx Volume (yd³) |
|---|---|---|---|---|---|
| 1 | Rectangle Slab | 24 × 12 × 0.5 (thickness) | feet | 1 | 24*12*0.5 / 27 = 5.33 |
| 2 | Footing/Trench | 120 × 2 × 2 | feet | 1 | 120*2*2 / 27 = 17.78 |
| 3 | Column/Pier | Dia 1.5, Height 10 | feet | 4 | π*(0.75²)*10*4 / 27 ≈ 2.62 |
| 4 | Stairs (Solid) | Width 4, Rise 2.5, Run 9 | feet | 1 | 0.5*4*2.5*9 / 27 ≈ 1.67 |
Formula Used
- Rectangle Slab: L × W × T
- Circular Slab: π × (D/2)² × T
- Footing/Trench: L × W × D
- Wall: L × H × T
- Column/Pier: π × (D/2)² × H
- Stairs (Solid): 0.5 × Width × Total Rise × Total Run
- Convert all linear dimensions to feet, compute ft³.
- yd³ = ft³ ÷ 27; m³ = yd³ × 0.764555.
- Waste applied to sum: Vw = V × (1 + p/100).
- Rounding applies after waste for ordering convenience.
- Weight ≈ ft³ × density; short tons = pounds ÷ 2000.
How to Use
- Click Add Shape for each distinct pour shape.
- Choose units, enter dimensions, and set quantity.
- Adjust waste percent, rounding, truck capacity, and optional cost.
- Review totals; refine to match delivery and placement constraints.
- Export a CSV or PDF summary for orders.
Always verify site measurements and local code or specification requirements before ordering.
FAQs
Common practice is 5–10% for simple slabs; irregular shapes, slopes, or difficult access can require more. Discuss specifics with your supplier and finisher.
Yes, ordering in quarter- or half-yard increments is typical. This helps avoid shortages and aligns with truck batching practices.
This tool uses a triangular-prism approximation for solid stairs. For complex designs, model in segments or consult drawings for precise volumes.
Yes. Each row lets you choose units. The calculator converts internally and presents totals in yards, feet, and meters.
Approximately 60‑lb bags: ~60 bags per yard (0.45 ft³ each). 80‑lb bags: ~45 bags per yard (0.60 ft³ each). Ready‑mix is recommended for volumes over ~2 yards.
Results
Total, no waste (yd³):
0.000
Total with waste (yd³):
0.000
m³: 0.000 • ft³: 0.0
Rounded for order (yd³):
0.000
Rounding applies after waste; set in Inputs.
Estimated trucks:
0 (capacity 8 yd³)
Weight (short tons):
0.00
Based on density setting. Pounds: 0
Bag equivalents (60 / 80 lb):
0 / 0
Calculated from volume with waste (not order rounding).
Per-Row Volumes
Assumptions
- All computations assume prismatic geometry and true dimensions.
- Stairs approximated as solid right-triangular prism.
- Yields and densities are typical values; adjust as needed.