Concrete Volume Tools

Created By : Prasanna
Reviewed By : Phani Ponnapalli
Last Updated at : Oct 19,2023

The best Online Tool to calculate the weight and volume of concrete to fill your area is available here. All you have to do is type the input of the length, width, and height of the room or space in the input field and tap on the Calculate button to get the amount of concrete required in no time. You can also use another calculator tools for other calculations concrete step calculator, concrete calculator for steps, concrete quantity calculator, and concrete footer calculator.

Choose a Calculation

Concrete Tools: At times when you feel lazy to do your calculations. In such cases, if you ever need help with calculating the amount of concrete required take the help of the free tool. Learn how to estimate the volume and weight of the concrete that is required to fill the area by referring to the coming modules. Review the step-by-step method explained by considering an example and comprehend the concept much better. 

What is Concrete?

Concrete is one of the most widely utilized building materials in the world. It's made up of fine and coarse aggregates that are held together by fluid cement (cement paste) that hardens over time. Sand and gravel (or crushed stone) are commonly used as aggregates, with water and portland cement as the paste.

The term "portland cement" is used in almost all concrete cement and water solidifies and joins the aggregates into a rock-like mass through a process called hydration. After 28 days, concrete has reached its maximum compressive strength of roughly 99 percent. This hardening process, on the other hand, takes years to complete, resulting in stronger concrete over time.

Different Concrete Forms and Formulas for Volume

A concrete form is a formwork system usually for reinforced cement a concrete form acts as a formwork system. concrete that includes strong thermal insulation. The concrete casing is required to give the concrete a shape.

Here are a few popular concrete forms:

  1. Slab or square footing concrete form

The formula for volume = length × width × thickness

  1. Column or rounding concrete form

Formula for volume = п × (radius) 2 × height

  1. Circular or tube concrete form

Formula for volume = п × [(outer radius) 2 – (inner radius) 2] × height

Difference Between Ready Mix And Bagged Concrete

Differences between ready mix & bagged concrete are explained by using certain factors, as follows:


Ready-Mix Concrete

Site-Mixed Concrete


Delivered ready to use and with little effort.

Multiple processes, formulas, and the setting time all contribute to a slower process.


It is not necessary to bring any equipment to the construction site.

To produce concrete on-site, you'll need a weight batch mixer.


Within a project, it might be distributed to several locations.

To avoid contamination, it must be combined right before use.

Practical use

High-rise buildings

Low-rise buildings

Requirements for storage

Raw materials do not require additional storage space.

To store and maintain products like cement and aggregates, a controlled storage room is needed.


There is very little material waste on the job site.

During storage and mixing, some material is lost.

Quality parameter

Because of the mechanized and controlled environment, the quality is consistent.

To ensure batch consistency, continuous supervision is required. Due to variance, the time for setting may vary.


The only time skilled labour is necessary is for the concrete to be poured and compacted.

Concrete preparation at the project site necessitates extra man-hours


A sufficient entrance for the concrete mixer truck is required.

Space for material storage and batch mixers is required.


Concrete in large quantities can be delivered.

It's tough to mix big amounts of concrete on-site.

Steps to Find How Much Concrete Do I Need?

  1. Estimate the volume of concrete you need.
  2. Check the dimension of a concrete slab & quantity of slabs needed.
  3. Check the weight of all the required materials. Here, we consider the density of premix concrete as 2130 kg/m3.
  4. Check the size of a bag to see the quantity of concrete produced per bag.

Solved Example for Calculating Concrete Volume and Weight with Manual Calculations


The dimension of a concrete slab is 20x12x12 cm. We need 50,000 such slabs for construction. Calculate the weight of all the material & if the concrete bag size is 50 kg, then how many bags of concrete is required?


Here, dimension is given for a slab.

So, volume of a slab = 20 × 12 × 12 = 2880 cm3 = 0.00288 m3

As we need 50,000 slabs,

Total volume of concrete required = 50000 × 0.00288 = 144 m3

As the density of premix concrete as 2130 kg/m3, we can say that

Total weight of material = 2130 × 144 = 306720 kg

As each concrete bag weigh only 50 kg,

306720 / 50 = 6134.4

We need approximately 6135 bags of concrete.

You can find the best online tools for your help in daily calculations from a trusted website with solutions to your doubts.

FAQs on Concrete Volume and Weight Tools with Steps

1. How many 20kg bags of cement makes a cubic meter of concrete?

You will require 110 bags of cement to make a cubic meter of concrete.

2. How much concrete is needed for a 10×10 room?

For a 10×10 room, you will require approximately 1.3 cubic yards of concrete. Here extra 10% is added to overcome the depth variations or spills.

3. How much concrete do I need for a 4×8 slab?

Usually for a slab that is 4×8 in dimensions you can choose from 23- 60lb, 18- 80lb or 36- 40lb bags of concrete. You can also answer throught the same calculator tool to the questions like  how much concrete do we need for 3 steps,  how much concrete do i need for a footer, how much concrete do i need for steps, and  how to calculate concrete volume for steps.

4. How many yards of concrete do I need for a 24×24 slab?

For a 24×24 slab, you will require 7.11 yards of concrete. You can also know, how many bags of concrete do i need calculator.