TMT Steel Bar weight calculator comes in handy when civil contractors, engineers, or architects ask builders or owners to get a particular quantity of TMT steel bars for construction.
The requirement for steel bars might be in the number of rods (pieces), the number of bundles (kg) or metric tons (mt) as it is the most recommended method by engineers and contractors.
“TMT steel bars are available from 8mm to 32mm as the requirements for the size also vary depending on the application and structure of the building.”
Points to keep in mind about TMT steel bar weight
- The length of the TMT Steel Bar is 12 meters in general standard.
- Weight Tolerance of TMT steel bars is IS 1786:2008 as per IS guidelines.
- The different sizes (diameter) of TMT steel bars produced are 8mm, 12mm, 16mm, 20mm, 25mm, 28mm, and 32mm.
- The TMT steel bars are generally calculated in kilograms, tons, or quintals (1 Quinta = 100 kg, 1 Ton = 1000 kg).
Kairali TMT Steel Bars Weight Chart
Please refer to the Weight Chart table below for a basic understanding of how the weight of TMT steel bars is calculated for different diameters of TMT steel bars:
| Size MM | Bis Standard KG/MTR. | Kairali Values Kg/Mtr. | ||
|---|---|---|---|---|
| min | avg | max | ||
| 8 | 0.367 | 0.395 | 0.423 | 0.375 TO 0.400 |
| 10 | 0.574 | 0.617 | 0.660 | 0.580 TO 0.620 |
| 12 | 0.844 | 0.888 | 0.932 | 0.850 TO 0.910 |
| 16 | 1.501 | 1.580 | 1.659 | 1.510 TO 1.600 |
| 20 | 2.396 | 2.470 | 2.544 | 2.400 TO 2.510 |
| 25 | 3.734 | 3.856 | 3.964 | 3.750 TO 3.910 |
| 28 | 4.685 | 4.830 | 4.975 | 4.700 TO 4.900 |
| 32 | 6.121 | 6.310 | 6.499 | 6.184 TO 6.436 |
Weight Chart of TMT Bars per Bundle
| TMT Steel Bar Size in mm | Length of TMT Steel Bar (Meter) | TMT Steel Bar pieces per bundle (No.s) | Total Weight of TMT Steel Bar bundle (Kg) |
|---|---|---|---|
| 8 | 12 | 10 | 45 Kg |
| 10 | 12 | 7 | 48.72 Kg |
| 12 | 12 | 5 | 51 Kg |
| 16 | 12 | 3 | 54.36 Kg |
| 20 | 12 | 2 | 57.6 Kg |
| 25 | 12 | 1 | 45 Kg |
| 28 | 12 | 1 | 56.4 Kg |
| 32 | 12 | 1 | 74.21 Kg |
TMT Steel Bar Weight Conversion Calculator
Why Accurate TMT Bar Weight Matters in Construction
Understanding the exact weight of TMT bars is more than just a numbers game. It directly impacts your project’s cost, strength, and safety. A small error in calculation can lead to over-ordering or under-supply, both of which affect the project budget and timeline.
Accurate weight estimation helps you:
- Plan the right quantity of steel required for slabs, beams, and columns
- Avoid material wastage and unnecessary expenditure
- Ensure structural safety by maintaining the correct reinforcement ratio
- Streamline procurement and billing for large construction projects
By using a reliable TMT steel bar weight calculator, you can maintain consistency and accuracy across every stage of construction — from design to execution.
Common Mistakes to Avoid When Calculating Steel Weight
Even experienced builders sometimes make small miscalculations that lead to major cost overruns. Here are a few common pitfalls to watch out for:
- Using wrong units: Always ensure that diameter and length are in consistent units (mm and metres) when using the formula.
- Ignoring bending allowances: Extra length added for hooks and bends can increase total steel weight by 3–5%.
- Forgetting tolerances: Every TMT manufacturer follows IS 1786:2008 tolerance limits — factor these in for precision.
- Rounding errors: In large projects, even minor rounding mistakes can cause significant discrepancies in total weight.
Being aware of these points ensures that your material estimation stays accurate and your construction budget stays on track.
FAQs
The formula for the weight of a steel bar is W=D2L/162.
Here,
W= Weight of the TMT Steel Bars
D= Diameter of TMT Steel Bar in Millimetres (mm)
L= Length of TMT Steel Bar in Meters (m)
For example, the weight of a steel bar with a 60m length and 12 mm diameter will be,
If we substitute the variables of the weight of steel bars formula, the calculation would be:
W=122 x 60/162=53kgs
The weight of a steel bar varies according to its diameter and length of it. Typically, 8mm and 1m TMT steel bars would weigh between 0.375 & 0.400.
The formula for weight of steel bar per meter is W=D21/162
For example, if it’s an 8mm steel bar, the formula would be 821/162, which equals 0.395 kgs.
TMT steel bar weight is typically denoted in kilograms (kgs), tonnes (T or Ton) and Pounds (lbs).