Calculator Form
Use one column for the page, but keep the form responsive with three columns on large screens, two on smaller screens, and one on mobile.
Example Data Table
| Example | Input Summary | Base Volume | Total With Waste | Truck Plan |
|---|---|---|---|---|
| Warehouse Slab | 40 ft × 30 ft × 0.5 ft, 5% waste, 10 yd³ trucks | 22.222 yd³ | 23.333 yd³ | 3 trucks |
| Retaining Wall | 60 ft × 8 ft × 0.667 ft, 7% waste, 8 yd³ trucks | 11.852 yd³ | 12.681 yd³ | 2 trucks |
| Strip Footing | 120 ft × 2.5 ft × 1 ft, 5% waste, 10 yd³ trucks | 11.111 yd³ | 11.667 yd³ | 2 trucks |
| Circular Pad | 12 m diameter × 0.18 m, 6% waste, 7 m³ trucks | 20.358 m³ | 21.579 m³ | 4 trucks |
| Round Columns | 16 columns, 0.4 m diameter, 3.2 m high, 5% waste, 6 m³ trucks | 6.434 m³ | 6.756 m³ | 2 trucks |
Formula Used
Rectangular Slab, Wall, and Footing
Volume = Length × Width × Thickness for slabs and footings.
Volume = Length × Height × Thickness for walls.
All dimensions are first converted into meters, then the calculator finds cubic meters and cubic yards.
Circular Slabs and Round Columns
Volume = π × Radius² × Thickness for circular slabs.
Volume = π × Radius² × Height × Count for round columns.
Waste Adjustment and Truck Count
Waste Volume = Base Volume × Waste %
Total Order Volume = Base Volume + Waste Volume
Exact Loads = Total Order Volume ÷ Truck Capacity
Total Trucks Needed = Ceiling of Exact Loads
Fresh Concrete Weight
Estimated Weight = Total Order Volume × Density
The default density is 2400 kg/m³, which fits normal concrete mixes used in many construction projects.
How to Use This Calculator
1. Choose the pour type
Select slab, wall, footing, circular slab, columns, or direct volume based on the concrete element you are planning.
2. Enter dimensions in one unit system
Pick a dimension unit, then enter all matching values in that same unit so the conversion stays accurate.
3. Add waste and truck details
Enter a waste percentage, truck capacity, capacity unit, and order increment that matches how your supplier dispatches loads.
4. Review the result panel
After you submit, the result section appears above the form with total volume, truck counts, utilization, rounding buffer, and weight.
5. Export the summary
Use the CSV button for spreadsheet work or the PDF button for a shareable delivery planning snapshot.
FAQs
1. What truck capacity should I enter?
Use the actual capacity provided by your ready-mix supplier. Common values are 8 to 10 yd³ or 6 to 8 m³, but legal road limits, mix type, and local fleet rules may reduce usable payload.
2. Does the calculator include waste automatically?
No. You control waste with the waste percentage field. This keeps the calculator flexible for clean slab pours, congested footings, pump priming, overexcavation, and other site conditions.
3. Why is the final truck only partially loaded?
Most pours do not divide perfectly by truck capacity. The last truck often carries the remaining balance, which is why the calculator shows final load size and utilization percentage.
4. Can I work in metric and imperial units?
Yes. You can enter dimensions in feet, inches, yards, meters, or centimeters. The calculator also reports cubic meters and cubic yards for easier coordination with drawings and suppliers.
5. Why does the rounded order matter?
Suppliers often batch in practical increments rather than tiny fractions. Rounding up helps avoid under-ordering and shows how much buffer your selected ordering rule adds to the pour.
6. Does rebar reduce the concrete volume?
Usually the displacement is small for preliminary ordering, so many teams ignore it. For heavily reinforced members, adjust the direct volume manually if your engineer provides a net concrete quantity.
7. Can I use this for pumped concrete placements?
Yes, but add a realistic waste factor. Pump line priming, washout allowances, longer lines, and slower placements can all change the practical amount you should order.
8. When should I use direct volume mode?
Use direct volume when your engineer, estimator, BIM model, or quantity takeoff already gives total concrete volume. Then this tool focuses only on waste, dispatch loads, rounding, and exports.