# Some useful tips to work out the steel quantities in slabs

In this construction video tutorial you will learn the method for measuring the steel quantity in slabs in feets.

Suppose, the length of the slab is 15 feet and width is 10 feet. The main bars and distribution bars diameter are taken as #4@6 c/c.

To measure the main bars, the following formula is used :-

No. Of main bars = Total distance/c/c + 1
The distance taken should be perpendicular to the main bar.

After putting values, we get the following :-

15’/0.5’ + 1 (after converting inches to feet) = 31 numbers
Therefore, total length of main bars = 31 x 10 = 310 feet.
Weight of main bars = D2 / 24 x length = 42/24 x 310 = 206.7 lb
As 1 kg = 2.204 lb, therefore, 206.7 lb = 206.7/2.204 = 93.77 kg

The number of distribution bars will be calculate as follow :-

No. of distribution bars = 10/0.5 + 1 (width = 10 feet and center to center distance = 6 inches) = 21
So, length of distribution bars = 21 x 15 = 315 feet (length = 15 feet)

Weight of the distribution bars will be as follow :-

D2 / 24 x length = (4)2 /24 x 315 = 210 lb or pound.
To convert in kg, 210/2.204 = 95.28 kg
So, weight = 95.2814 kg
So, total weight of required steel bars = weight of man bars + weight of distribution bars = 93.77 + 95.28 = 189 kg