TMT bars are a crucial component of reinforced concrete structures, providing strength, durability and structural stability. Whether you are planning a residential project, commercial building or large-scale infrastructure, understanding the TMT bar weight chart can help you estimate material requirements and manage construction costs more efficiently.
This guide explains the TMT bar size and weight for commonly used diameters, including 8mm, 10mm, 12mm, 16mm and 20mm bars.
The weight of a TMT bar depends primarily on its diameter and length. A standard TMT bar is generally 12 metres long. The following TMT bar weight chart in kg provides approximate weights for standard 12-metre bars:
TMT Bar Size| Approx. Weight per Metre| Approx. Weight of 12m Bar
8mm| 0.395 kg| 4.74 kg
10mm| 0.617 kg| 7.40 kg
12mm| 0.888 kg| 10.66 kg
16mm| 1.58 kg| 18.96 kg
20mm| 2.47 kg| 29.60 kg
These values are useful for estimating the quantity and total steel requirement for a project.
An 8mm TMT bar weight is approximately 0.395 kg per metre, making a standard 12-metre bar around 4.74 kg. These lighter bars are commonly used for stirrups, distribution reinforcement and other applications where smaller reinforcement is required.
The 10mm TMT bar weight is approximately 0.617 kg per metre. Therefore, a 12-metre bar weighs around 7.40 kg. It is frequently used in residential construction and reinforced concrete applications where moderate reinforcement is required.
A 12mm TMT bar weight is around 0.888 kg per metre, or about 10.66 kg for a 12-metre bar. Due to its balance of strength and weight, 12mm reinforcement is widely used in slabs, beams, columns and other structural elements.
The 16mm TMT bar weight is approximately 1.58 kg per metre. A standard 12-metre bar therefore weighs around 18.96 kg. Its greater diameter makes it suitable for applications requiring higher reinforcement strength, including beams and columns.
A 20mm TMT bar weight is around approximately 2.47 kg per metre, while a 12-metre bar weighs nearly 29.60 kg. These heavier bars are generally selected for structural members that require substantial reinforcement and load-bearing capacity.
Knowing how to calculate TMT bar size and weight can make material estimation easier. The commonly used formula is:
Weight per metre = D² ÷ 162
Here, D represents the bar diameter in millimetres.
For example, for a 12mm bar:
12² ÷ 162 = 0.888 kg per metre
You can multiply the weight per metre by the required bar length to estimate the total weight. A TMT bar weight calculator can also be used to quickly calculate requirements for different diameters and lengths.
BIS Standards for TMT Bar Weight and Permissible Tolerance:
The Bureau of Indian Standards (BIS) specifies requirements for high-strength deformed steel bars and wires for concrete reinforcement under IS 1786:2008. The standard specifies nominal sizes, cross-sectional areas, nominal mass per metre and permissible tolerances on nominal mass.
Amba Shakti Tricore completely complies with the applicable BIS standards for TMT bars, including the requirements related to nominal mass and permissible weight tolerances under IS 1786:2008.
This compliance helps ensure that the TMT bars supplied meet the specified requirements for quality, consistency and performance, giving customers greater confidence when selecting reinforcement steel for their construction projects.
A reliable TMT bar weight chart in kg helps contractors, engineers and buyers estimate steel quantities, compare material requirements and reduce unnecessary wastage. Checking the 8mm TMT bar weight, 10mm TMT bar weight and 12mm TMT bar weight, along with larger sizes such as 16mm and 20mm, makes planning more systematic.
For accurate project estimation, always consider the structural design, specified bar diameter, actual bar length and applicable construction standards before ordering TMT steel.
The weight of a 12-metre TMT bar depends on its diameter. An 8mm bar weighs approximately 4.74 kg, a 10mm bar weighs 7.40 kg, a 12mm bar weighs 10.66 kg, a 16mm bar weighs 18.96 kg, and a 20mm bar weighs around 29.60 kg.
TMT bar weight can be calculated using the formula D² ÷ 162, where D is the bar diameter in millimetres. For example, a 12mm TMT bar weighs approximately 12² ÷ 162 = 0.888 kg per metre.
An 8mm TMT bar weighs approximately 0.395 kg per metre, a 10mm bar weighs 0.617 kg per metre, and a 12mm bar weighs around 0.888 kg per metre. For a standard 12-metre length, their approximate weights are 4.74 kg, 7.40 kg and 10.66 kg, respectively.
A 16mm TMT bar weighs approximately 1.58 kg per metre, while a 20mm TMT bar weighs around 2.47 kg per metre. For a 12-metre bar, the approximate weights are 18.96 kg and 29.60 kg, respectively.
TMT bars in India are covered under IS 1786:2008, which specifies requirements including nominal sizes, cross-sectional areas, nominal mass per metre and permissible tolerances on nominal mass. Manufacturers should ensure that their TMT bars comply with the applicable BIS requirements.
