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##### Asked by: Riccardo Altnickel

business and finance construction industry# How do you calculate slab thickness?

**How to calculate concrete:**

- Determine how
**thick**you want the**concrete**. - Measure the length and
**width**that you'd like to cover. - Multiply the length by the
**width**to determine square footage. - Convert the
**thickness**from inches to feet. - Multiply the
**thickness**in feet by the square footage to determine cubic feet.

Besides, what is the minimum thickness of slab?

UBC recommends **minimum thickness** of Concrete floor **slabs** supported directly on the ground to be 89mm, whereas BCGBC4010A – Apply structural principles to residential low-rise constructions determined **minimum thickness** to be 100mm.

**depth**ratio = the effective

**depth**. The overall

**depth**of

**slab**= effective

**depth**+ the cover to reinforcement + half the diameter of reinforcing bar.

Herein, how thick should slab on grade be?

An article once reported that the **thickness** of one specified 6 inch **slab** varied from 2 ¾ inches to 8 inches, but the “normal” range **should** have been between 4 ½ inches to 7 ½ inches of **thickness** with an “average” concrete **thickness** of 5 ¼ to 5 ½ inches.

Moreover, the **minimum thickness** of any **two way slab** without interior beams should not be less than the following: For **slabs** without drop panel 125 mm. For **slabs** with drop panel 100 mm.