TMT Bar Sizes and Weight Chart: 8mm, 10mm, 12mm, 16mm, 20mm, 25mm & 32mm
TMT bars are available in different diameters to meet the reinforcement requirements of different structural members. Common TMT bar sizes include 8mm, 10mm, 12mm, 16mm, 20mm, 25mm and 32mm.
The required diameter depends on the structural design, type of RCC member, reinforcement requirements and load conditions of the structure.
Mongia Steel TMT rebars are currently listed in Fe600 grade and sizes ranging from 8mm to 32mm, providing different diameter options for reinforcement requirements based on structural design.
TMT Bar Size and Weight Chart
The theoretical unit weight of a TMT bar can be calculated using the formula:
Weight per metre = D² ÷ 162
Where D = diameter of the bar in millimetres.
| TMT Bar Size | Approx. Weight per Metre | Approx. Weight for 12m Bar |
| 8mm | 0.395 kg/m | 4.74 kg |
| 10mm | 0.617 kg/m | 7.40 kg |
| 12mm | 0.889 kg/m | 10.67 kg |
| 16mm | 1.580 kg/m | 18.96 kg |
| 20mm | 2.469 kg/m | 29.63 kg |
| 25mm | 3.858 kg/m | 46.30 kg |
| 32mm | 6.321 kg/m | 75.85 kg |
These are theoretical weights calculated using the standard formula. Actual supplied weight can vary within the applicable standard’s permitted tolerances.
What Are the Different TMT Bar Sizes Used For?
The appropriate TMT bar diameter depends on the structural drawings and reinforcement design. The following are general applications and should not replace structural engineering specifications.
8mm TMT Bar
8mm TMT bars are commonly used for lighter reinforcement and secondary reinforcement applications, including stirrups, distribution reinforcement and other applications specified in structural drawings.
10mm TMT Bar
10mm TMT bars may be used for slabs, stirrups and other reinforcement requirements depending on the structural design and spacing requirements.
12mm TMT Bar
12mm TMT bars are widely used in residential construction and may be specified for slabs, beams, columns and other RCC members based on engineering calculations.
16mm TMT Bar
16mm TMT bars are generally used where a greater reinforcement area is required, including certain beams, columns and other structural members.
20mm TMT Bar
20mm TMT bars are commonly associated with heavier reinforcement requirements in structural members such as columns, beams and foundations.
25mm TMT Bar
25mm TMT bars are used where structural calculations require larger reinforcement diameters, particularly in heavily reinforced structural members.
32mm TMT Bar
32mm TMT bars are among the larger commonly supplied diameters and may be used in heavily reinforced structural members and infrastructure applications.
Important: These are general applications only. The structural engineer’s drawings and bar bending schedule should always determine the required TMT bar diameter, quantity and spacing.
How Is TMT Bar Weight Calculated?
The theoretical TMT bar weight formula is:
Weight per metre = D² ÷ 162
For example:
12mm TMT bar:
12 × 12 ÷ 162 = 0.889 kg/m
16mm TMT bar:
16 × 16 ÷ 162 = 1.580 kg/m
20mm TMT bar:
20 × 20 ÷ 162 = 2.469 kg/m
This calculation helps contractors, engineers, builders and buyers estimate the approximate quantity and weight of TMT steel required for a project.
For actual purchasing, buyers should also consider the manufacturer’s specifications and applicable weight tolerances.
How Many TMT Bars Are Needed for a House?
There is no single TMT bar quantity that applies to every house. The requirement depends on several factors, including:
- Built-up area
- Number of floors
- Structural design
- Foundation type
- Column sizes
- Beam sizes
- Slab design
- Soil conditions
- Seismic requirements
- Bar diameter
- Reinforcement spacing
A structural engineer should calculate the reinforcement requirement using the structural drawings and Bar Bending Schedule (BBS).
The total quantity of steel should therefore be based on the project’s actual structural design rather than a general estimate based only on built-up area.
How Do You Choose the Right TMT Bar Size?
The right TMT bar size should be selected based on:
- Structural drawings
- Bar bending schedule
- RCC member type
- Load requirements
- Span
- Reinforcement spacing
- Applicable design codes
- Construction requirements
A larger-diameter bar is not automatically the correct choice for every structural application. The required diameter and spacing should be determined by structural calculations.
Mongia Steel TMT Bar Sizes
Mongia Steel TMT rebars are available in Fe600 grade and sizes from 8mm to 32mm. The published product information includes technical specifications, mechanical properties, bend properties and weight-tolerance information.
For buyers researching different steel products and specifications, the Mongia Steel products section provides an overview of the company’s available steel products.
If you are comparing the cost of different bar diameters, you can also check the current TMT prices published by Mongia Steel for different regions and bar sizes.
Frequently Asked Questions
What are the common TMT bar sizes?
Common TMT bar sizes include 8mm, 10mm, 12mm, 16mm, 20mm, 25mm and 32mm. The required diameter depends on the structural design and reinforcement requirements.
What is the weight of a 12mm TMT bar?
The theoretical unit weight of a 12mm TMT bar is approximately 0.889 kg per metre. For a 12-metre bar, the theoretical weight is approximately 10.67 kg.
What is the weight of a 16mm TMT bar?
A 16mm TMT bar has a theoretical weight of approximately 1.58 kg per metre, or approximately 18.96 kg for a 12-metre bar.
What is the weight of a 20mm TMT bar?
A 20mm TMT bar has a theoretical weight of approximately 2.47 kg per metre, or approximately 29.63 kg for a 12-metre bar.
What is the weight of a 25mm TMT bar?
A 25mm TMT bar has a theoretical unit weight of approximately 3.86 kg per metre, or approximately 46.30 kg for a 12-metre bar.
What is the weight of a 32mm TMT bar?
A 32mm TMT bar has a theoretical unit weight of approximately 6.32 kg per metre, or approximately 75.85 kg for a 12-metre bar.
Which TMT bar size is used for house construction?
Different TMT bar sizes can be used in different parts of a house. Reinforcement requirements may vary between slabs, beams, columns, foundations and stirrups.
The correct diameter, spacing and quantity should always be determined from the structural drawings and calculations provided by a qualified structural engineer.
What sizes of TMT bars are available from Mongia Steel?
Mongia Steel currently lists Fe600 TMT rebars in sizes from 8mm to 32mm, including 8mm, 10mm, 12mm, 16mm, 20mm, 25mm and 32mm.
How can I check the current TMT bar price?
TMT bar prices vary by diameter, location and market conditions. Buyers can refer to Mongia Steel’s current TMT prices for available regional pricing information.
