To work out quantities of concrete, floor screed, paving slabs, bricks and blocks.
Add the length of the trench or floor space, you can change it from imperial to metric by clicking on the arrow.
Add the width of the trench or floor space, again remembering to change it from imperial to metric if needed.
Add the thickness of the concrete or floor material.
Quantiy is for how many trenches or floor spaces you require to fill.