Spike's Calculators

Concrete Volume Calculator from Square Metres

Calculate the amount of concrete you will need for an area measured in square metres and a depth (thickness) measured in millimetres.
Cubic metres = S * D
where S is the area in square metres
D the depth of the area in millimetres
Example Calculation
slab covers an area of  55 square metres
the average depth is 152 millimetres

First convert the 152 millimetres to metres by dividing by 1000.
152 ÷ 1000 = 0.152
152 millimetres = 0.152 metres

Calculate the volume in cubic feet by multiplying the area by the dept of the slab.
55 * 0.152 = 8.36 
You will need 8.36 cubic metres of concrete for this slab.


Square Metres of Area
Slab Thickness mm
Waste    %


Concrete Needed in Cubic Metres:
Cubic Yards: yd³
Cubic Feet: ft³


  1. enter the square metres of the area
  2. the slab's thickness (depth) in millimetres
  3. waste factor (if required) in a percentage


  1. the amount of concrete in cubic metres
  2. in cubic yards
  3. in cubic feet

When Ordering Concrete

This concrete calculator will help you in estimating the amount of concrete needed for your project. The amount given as needed, does not include any waste. It is recommended, depending on the job you are doing, to add anywhere from an extra 4% to 10% to your concrete order to make sure you have enough concrete to finish the job. Ask when ordering the concrete. They will be able to give you a good idea of what is needed.


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