Why don’t We Exclude Steel Volume in Concrete Calculation? – Quick Tips

Welcome to our Quick Tip series post,

There are some unanswered questions which may be answered within a minute or within 2-3 sentences. Nobody specifically wants us to know or no one asks us in the interview.

But it is our responsibility as a civil engineer to know every in & out of construction.

Let’s get started.

Why don’t we exclude steel volume in Concrete Calculation?

Whenever we calculate the concrete volume to cast structural members like a beam, footing or slab, we don’t actually exclude the steel reinforcement quantity.


Steel quantity varies anywhere from 1% – 3% of the structural member’s volume which is comparatively low. So we will neglect that.

In simple,

Take the below example,

Typical beam drawing

We will calculate the required concrete volume for the above beam as,

V = L x B x D = 3 x 0.2 x 0.5 = 0.3 m3

According to the thumb rule, the concrete wastage is 3%, the reinforcement for the above example may be 3% = 0.009 m

That steel reinforcement volume will be compromised with the wastage of concrete. So that we don’t actually exclude the steel reinforcement in concrete calculation

We hope you understand the concept.

Happy Learning 🙂