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How to Calculate Weight of TMT Steel Bar

Calculation  of TMT bar Weight

TMT bars are extensively used in building construction and hence, their weight becomes a subject of paramount importance. To discover the mass of steel per meter square, the exact formula is D*D/162. In this formula, D is the diameter of the bar in meters as well as the mass will be evaluated in kilograms. Here, W is known as the weight of the bar in kg, D is known as the diameter of the bar in mm, plus L in the length of the bar in meters.

Calculation for the weight of a steel bar:

Formula for weight of Steel bars = πD*2/ 4 × L × density,

In the formula, w = weight of steel, π = 3.14, L= length of Steel bar =1m, D = diameter of Steel bar in mm in addition to density = 7850 kg/ m3.

Calculation of TMT bar section weight:

In case, we set 1 meter length for every diameter of steel bar in the formula then we will obtain the unit weight, here.

  1. 6 mm ø bar = 6² x 1/162 = 0.222 kg per m.
  2. 8 mm ø bar = 8² x 1/162 = 0.395 kg per m.
  3. 10mm ø bar = 10² x 1/162 = 0.617 kg per m.
  4. 12mm ø bar = 12² x 1/162 = 0.888 kg per m.
  5. 16mm ø bar = 16² x 1/162 = 1.580 kg per m.


Weight of 12mm steel bar:

For example , diameter of steel = 12mm, length of 1 steel rod = 12 meter, after that weight of 1 piece of 12mm steel rod in kilogram = (12×12×12)/162 = 10.667 kg.

Thus, weight of 1 piece 12mm Steel rod is 10.667 kg.

Weight of 1 TMT bar:

TMT Steel Weight Chart:


Number of Rods


12 MM

Five Rods

52 KG

16 MM

Three Rods

55 KG

20 MM

Two Rods

60 KG

25 MM

One Rod

46 KG


How do you determine steel weight in kg?

  1. Weight of bar in kg per meter ought to be calculated as (d2÷ 162), where'd' is known as the diameter of bar in mm.
  2. 'L' for column major steel in footing is supposed to be considered as least 30cm/as specified.
  3. For bent up bar, include 0.42d in straight length of bar, where’d’ is known as the clear depth of beam per slab.

How do you evaluate steel weight in feet?

  1. Is the formula to estimate the weight of steel bars in KG/feet?
  2. Thus, the weight of 10 mm bar shall be,
  3. (10 x 10) / 533 = 0.188 kg/feet.
  4. To be exact W= D2/533 it is.
  5. It is resulting from the very fundamental concept.
  6. Density of steel in terms of meter =7850 kg/m3> 7850/(1000X1000X1000) kg per mm.







Know more

Tmt Bars is used when

Building Superstructure

Lot of Material Required to build Super structure. Comaron Gurgaon provides you all the product related to Super structure for any construction.

Laying Down Foundation

Foundation work is important for any construction. Comaron Gurgaon provides complete Solution for Foundation work