How to Calculate Cubic Volume of Concrete

Concrete is used and sold on a cubic volume basis (usually by cubic yards although some places will sell by cubic feet). When converting between cubic yards / cubic feet / cubic inches use the following conversion factors:

  • 1 cubic yard = 27 cubic feet
  • 1 cubic foot = 1,728 cubic inches

To calculate how much concrete you would need to order to pour a slab use the following formula:

Slab thickness (in ft.) X Slab width (in ft.) X Slab length (in ft.) = Total cubic ft. of concrete required.