Calculate the concrete needed for a slab in cubic yards.
A slab's volume is length times width times thickness converted to feet. Dividing cubic feet by 27 gives cubic yards, and premixed bags convert to small projects. Ordering a ready-mix truck too small leaves you short, while too much concrete cannot be returned, so matching the true volume matters.
Concrete Volume
Cubic yards = length x width x (thickness/12) / 27
Cubic yards = length x width x (thickness/12) / 27 A slab's volume is length times width times thickness converted to feet. Dividing cubic feet by 27 gives cubic yards, and premixed bags convert to small projects.
Ordering a ready-mix truck too small leaves you short, while too much concrete cannot be returned, so matching the true volume matters.
This calculator takes 3 inputs: Slab length, Slab width, Slab thickness. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.