# How To Calculate Steel Quantity From Drawing

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## How to Calculate Steel Quantity From Drawing?

Data requires for steel quantity calculation

1) Plan of Section or Element. (Slab, Beam, Column & Foundation)

2) Section and Elevation Details.

3) All dimensions must be clear and co-related.

## General Guidelines To Be Followed In Preparing BBS

• The bars are required to be grouped together for each of the structural units, For e.g. beam, etc.
• In a building structure, the Listing of bars should be done floor to floor.
• For cutting and bending operations, schedules should be provided separately in the form of A4 sheets and should not be a part of the detailed reinforcement drawings.
• The form of the bar, fabric schedule, and the shapes of the bar used should be according to BS 8666.
• It is always preferable that bars should be listed in numerical order in the schedule for better understanding.
• The bar mark reference on the label which is attached to a bundle of bars refers separately and uniquely to a specific group of defined length, size, shape, and type used on the job.
• This is very crucial as a bar mark reference can then state a class of bar characteristics. Similarly, it is also helpful in the case of steel fixers and laborers can keep track of the type and number of bars needed to complete a specific work.

## Steel Quantity Calculation

Let, we take one example of a slab for steel quantity calculation.

Following Steel Quantity, we have to calculate from the drawing.

• Cement Concrete for Slab.
• Centering and Shuttering for Slab.
• Weight of 12mm dia. Bars.
• Weight of 8mm dia. Bars.
• Prepare Bar Bending Schedule.

(Note:  Weight of Steel bars 12mm – @ 0.9 kg / m

8 mm â€“ @ 0.4 kg/m,

## Slab Steel Quantity Calculation Estimation Sheet

(See drawing in to in dimension (without the wall) of the slab is given 3 m x 4 m. For calculating the Quantity of slab concrete we have to calculate the dimension of the slab.)

(Formwork Quantity is calculated in a square meter. There is one bottom portion and 4 sides shuttering. For the bottom, we have a dimension of slab 3m x 4m. For Side formwork, there are 2 different dimensions, 2 with 4 m wide and 2 with 3 m sides. For the total length we have to add the wall width of both sides to get the total length.)

Read More: Estimation of a Building with Plan

Steel Quantity Formula

(In case of bent bars are provided on both sides, we have to add 0.45 X twice in length)

## FAQs:

### How to Calculate Steel Quantity

Longitudinal steels
Calculate the total length of longitudinal bars which is equal to the height of the column plus laps for footing multiply the number of longitudinal bars.
Convert this length into kgs. This can be easily done by multiplying the cross-section area ofÂ steelÂ with the total length by the density ofÂ steelÂ which is 7850 kg/m3

### Steel Quantity Calculation

(Cutting length) main bar:Â formulaÂ = (l) + (2 x ld) + (1 x 0.42d) â€“ (2 x 1d), where l = clear span of theÂ slab, ld = development length which is 40 d (where d is the diameter of a bar), 0.42d = inclined length (bend length), 1d = 45Â° bends (d is the diameter of a bar) firstÂ calculateÂ the length of â€œdâ€œ.

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