Concrete Quantity Takeoff

V = L W t V_{order} = V (1 + waste)

Compute geometric volume of slabs, walls, footings, and columns. Add waste (often 5–10%) for spillage, over-excavation, and pump lines. Convert yd³ = ft³/27. Rebar is a separate takeoff (lb/ft × length × (1+lap waste)).

$L, W, t$: Plan dimensions and thickness
$waste$: Waste fraction

Step-by-step solved example

Slab 40 ft × 20 ft × 6 in, waste 8%. Order yd³?

Slab or wall volume L×W×t plus waste.

1. Volume
t=0.5 ft; V=40×20×0.5=400 ft³=14.81 yd³.
2. Order
14.81×1.08=16.0 yd³.

Answer: 16.0 yd³

10 practice questions

0/10 correct

1.ft³ to yd³: divide by

2.6 inches as feet is

3.Waste covers

4.A wall 50 ft × 10 ft × 8 in. V=

5.Columns: use

6.Footing 8×8×2 ft. V=

7.If waste is omitted you will

8.1 m³ is about

9.Rebar takeoff uses

10.A 10% waste factor on 20 yd³ is