# How to Calculate Concrete With Concrete Calculator

This free concrete calculator can be used to find out the quantity of required concrete mix for any construction project

## CONCRETE CALCULATOR FORMULA

The concrete is calculated with the following method :

- Find out the proper thickness of the concrete
- Calculate the length and width required to be covered
- Multiply the length by the width to decide square footage
- Change the thickness from inches to feet
- Multiply the thickness in feet by the square footage to specify cubic feet
- Chance cubic feet to cubic yards by multiplying with .037

For a 10’ by 10’ concrete patio, the calculation will be as follow :

- 10 x 10 = 100 square feet
- 4 ÷ 12 = .33
- 100 x .33 = 33 cubic feet
- 33 x .037 = 1.22 cubic yards

Calculation is done for volume and then change to cubic yards. For concrete, the formula for volume is given as follows:

length x width x thickness

To workout the required number of bags for concrete, divide the total cubic yards needed by the yield.

Apply the following yields per each bag size:

- 40 pound bag yields .011 cubic yards
- 60 pound bag yields .017 cubic yards
- 80 pound bag yields .022 cubic yards

## Method for working out the amount of concrete required for slabs (together with odd shapes)

**Rule of Thumb:** add 1/4" to the thickness of your slab for your slab concrete budget. It is assumed that the job is equally graded to the exact depth, and the grade is well compacted.

While examining your grade and it is found that one spot is 4", some spots are 4.5" to 5"-the best solution for both the job quality and your concrete budget is to fix the grade.

Odd shapes: Convert odd shapes into rectangles and odd shapes can be easily figured.

The estimate will be perfect if the figure driveway is 14' x 20' since the driveway is 16' at the top and 12' at the bottom. Through the center the width averages 14'.

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## Calculating the amount of concrete required for footings

Footings is seldom based on the drawing exactly. In rocky soil the footings may fall down when big rocks are excavated.

The excavator may have dug deeply, or it may have rained and footings required to be dug out deeper to attain solid. Therefore, it is necessary to examine different types of spots on your footing and retain an average size. Then with the help of the calculator, determine the amount of required concrete.

House slabs on grade that are 8" out of grade with a 4" slab also contain some of the footing over the grade too.

12" x 12" footing should be computed as 12" x 16" so the footing is figured to go over grade to attain the 4" slab thickness.

To perform calculation online, click on the following link

httpss://www.concretenetwork.com/concrete/howmuch/calculator.htm