Updated August 5th, 2020

If you want to estimate concrete ingredients, you need to know the **dry volume of concrete**.

To estimate the concrete quantity we just take the dimension from drawings and then calculate the volume. The result we get is the actual concrete quantity and it is the **wet volume of concrete**.

If you order ready-mix concrete from suppliers then this estimation is correct and you don’t have to do anything.

But if you want to produce concrete manually on-site, you need to order concrete ingredients separately. To estimate concrete ingredients, you need to know the **dry volume of concrete**.

## What is The Dry Volume of Concrete

The prime ingredients of concrete are **cement**, **fine aggregate** (*sand*), and **coarse aggregate** (*stone/brick chips*). Concrete is produced by adding water with the mix of these ingredients.

The volume of the mix of concrete ingredients before adding water is the **dry volume of concrete**.

## Difference Between “Wet Volume” and “Dry Volume” of Concrete

After adding water the volume of concrete ingredients is reduced to a certain level. It is happened due to the presence of air voids and pores in concrete ingredients.

*Let me give you an example.*

If you through a glass of water on a stack of sand, you’ll see a trench where the water is dropped. It’s happened due to evaporate air voids from sands. And thus, the volume is reduced.

## How to Calculate The Dry Volume of Concrete

You can get **wet volume** by multiplying dimensions of a concrete member from drawing. When we need to get the dry volume of concrete, we just multiply the wet volume by **1.54**.

**Now the question is what is 1.54? How do we get that?**

To understand this, we need to know the air voids and pores containing-capability of concrete ingredients.

*Let’s see.*

Air voids containing capability of,

- Coarse aggregate (stone/brick chips) –
**32%**to**34%** - Fine aggregate (sand) –
**20%**to**27%**

Due to very fine particles, the air void containing-capability of cement is ignored.

If we take the highest percentage of air voids in both *coarse and fine aggregates*, we get,

= 34% + 27%

= **61%**

But when sand and cement are mixed with coarse aggregate, it evaporates some air voids from the **coarse aggregate**. The percentage of this is **5%** to **7%**.

If we deduct this, we’ll get,

= 61% – 7%

= **54%**.

That means the dry volume of concrete ingredients is reduced by **54%** after adding water. in other words, the wet volume of concrete is increased by 54% in the dry condition.

So, the formula of dry volume of concrete is,

= **wet volume of concrete x 1.54**.

## Practical Example of Calculating The “Dry Volume of Concrete”

Suppose, you need to calculate the **dry volume of concrete** for an RCC column. The column dimension is given in the drawing as **30″ x 30″** and the height of the column is **10′**.

So, the **wet volume of concrete** for the column is,

= 30″ x 30″ x 10′

= **62.50 cubic feet** (*30″ = 2½′*)

The **dry volume of concrete** for the column is,

= **wet volume x 1.54**

= 62.50 x 1.54

= **96.25 cubic feet**.

**Conclusion**

To get the dry volume of concrete, first, calculate the wet volume of concrete by multiplying the dimension of concrete members as shown in the drawing. Then multiply the result by **1.54**. That’s it.

**Get The “Estimating Cheat Sheet” Free**.

antonio says

Glad it was helpful!

Liton Biswas says

Thank you, Antonio.

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Tatan Debnath says

Nicely explained😊keep it up

Liton Biswas says

Thank you, Tatan.

Dhanaji says

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Liton Biswas says

Thank you, Dhanaji.

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Liton Biswas says

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Liton Biswas says

I’m glad, Karthik.

Rafeeq S hameed says

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Vishwanath says

54% i understood but

how can add 1%

Total 1.54%

Please explain