Concrete Materials Calculator
Imperial

click here for our Metric calculator

These Concrete Calculators provide the required quantities of cement and all-in ballast or cement, sharp sand and gravel required to give a defined volume of finished concrete.

Both of these concrete calculators make an allowance for the fact that material losses volume after being mixed to make concrete.

Calculator are provided for a general mix and a paving mix, the different ratio of materials are:

  1. General mix - 1:5 cement:all-in ballast or 1:2½:3½ cement:sharp sand:gravel.
    and
  2. Paving mix - 1:3½ cement:all-in ballast or 1:1½:2½ cement:sharp sand:gravel.
Comment: If you are wondering how 1:2½:3½ equals 1:5 ("shouldn't it be 1:6" I hear someone say), the answer is that there is a lot of space between the individual pieces of gravel which will accommodate some sand, and when 2½ parts sand is mixed with 3½ parts gravel, the final volume will reduce down to about 5 parts.

General imperial mix - 1:5 or 1:2½:3½

Enter the finished volume of the work - then select 'Calculate now !':
Note: this calculator allows for the concrete 'shrinkage'
The materials needed are approximately:-
Portland cement
     
Sharp sand
Gravel - 1 inch
OR    
Ballast - 1 inch

 

Paving Imperial mix - 1:3½ or 1:1½:2½

Enter the finished volume of the work - then select 'Calculate now !':

Note: this calculator allows for the concrete 'shrinkage'
The materials needed are approximately:-
Portland cement
     
Sharp sand
Gravel - 1 inch
OR    
Ballast - 1 inch