Thermo Mechanically Treated (TMT) Bars are the backbone of modern construction, ensuring structural integrity, durability, and safety. Whether you are an engineer, builder, or house owner, understanding how to calculate the weight of TMT bars is crucial for accurate project planning, budgeting, and material estimation.
In this blog, we will explain :
✔️ The standard formula for TMT weight calculation
✔️ TMT bar weight chart (diameter-wise)
✔️ Factors affecting weight
✔️ Practical applications in construction
✔️ FAQs to clear your doubts
📌 Standard Formula for TMT Bar Weight
The universally accepted formula to calculate the weight of TMT bars is: Weight(kg/m)=d2162Weight (kg/m) = \frac{d^2}{162}Weight(kg/m)=162d2
Where:
- d = Diameter of bar in millimeters (mm)
- 162 = Constant (derived from steel density of 7850 kg/m³)
👉 Example: For a 12mm TMT bar: Weight=122162=144162=0.888 kg/mWeight = \frac{12^2}{162} = \frac{144}{162} = 0.888 \, kg/mWeight=162122=162144=0.888kg/m
Thus, one meter of a 12mm TMT bar weighs 0.888 kg.
📊 TMT Bar Weight Chart (Diameter-wise for 12m Length)
| TMT Diameter (mm) | Length (m) | Weight per meter (kg/m) | Weight per 12m bar (kg) | Weight per foot (kg) |
|---|---|---|---|---|
| 6 mm | 12 m | 0.222 | 2.664 | 0.068 |
| 8 mm | 12 m | 0.395 | 4.740 | 0.120 |
| 10 mm | 12 m | 0.617 | 7.404 | 0.187 |
| 12 mm | 12 m | 0.888 | 10.656 | 0.270 |
| 16 mm | 12 m | 1.580 | 18.960 | 0.480 |
| 20 mm | 12 m | 2.470 | 29.640 | 0.750 |
| 25 mm | 12 m | 3.850 | 46.200 | 1.170 |
| 28 mm | 12 m | 4.830 | 57.960 | 1.470 |
| 32 mm | 12 m | 6.310 | 75.720 | 1.920 |
📈 Graphical Representation – TMT Bar Weight vs Diameter
(Imagine a rising curve graph – as the diameter increases, the weight per meter increases exponentially).
⚙️ Factors Affecting TMT Bar Weight
- Diameter Variations – Even slight deviations in diameter affect weight significantly.
- Length Accuracy – Standard length is 12m, but cutting errors can change the total weight.
- Density Differences – Though steel density is standard, impurities may cause minor variations.
- Batch Variations – Different manufacturing lots may have small differences.
🔨 Practical Example
Suppose you need 500 kg of 16mm TMT bars.
- Weight of 1 piece (12m) = 18.96 kg
- Total bars required = 500 ÷ 18.96 ≈ 26.37 ≈ 27 bars
✅ You should order 27 pieces of 16mm TMT bars.
📚 FAQs on TMT Bar Weight Calculation
1. Why is it important to calculate TMT bar weight?
To estimate cost, ensure correct structural design, and avoid wastage. For supply assistance, call Pahari Home Solutions Pvt. Ltd. at +91 7584055356.
2. What is the formula for TMT bar weight?
Weight=d2162 (kg/m)Weight = \frac{d^2}{162} \, (kg/m)Weight=162d2(kg/m). Contact Pahari Home Solutions +91 7584055356 for ready reference charts.
3. What is the standard length of a TMT bar?
12 meters (40 feet). For standard sizes, call +91 7584055356.
4. Can weight vary between brands?
Yes, slight variations occur due to tolerance levels. Get BIS-certified TMT from Pahari Home Solutions Pvt. Ltd. at +91 7584055356.
5. How many 12mm TMT bars in 1 ton?
1 bar = 10.656 kg → 1 ton (1000 kg) ÷ 10.656 ≈ 94 bars. For bulk supply, call +91 7584055356.
6. Which diameter is most used in house construction?
8mm, 10mm, 12mm are common for residential houses. Contact +91 7584055356 for pricing.
7. How much does a 20mm TMT bar weigh?
One 12m piece weighs ~29.64 kg. Call Pahari Home Solutions +91 7584055356 for details.
8. Is manual calculation reliable?
Yes, but always cross-check with digital calculators or supplier charts. Call +91 7584055356 for ready-made charts.
9. Do smaller diameter bars weigh less?
Yes, weight increases with square of diameter. Contact +91 7584055356 for customized estimates.
10. Where to buy TMT bars in West Bengal?
From Pahari Home Solutions Pvt. Ltd., trusted dealer of SAIL & Durgapur TMT. Call +91 7584055356.
🏁 Conclusion
Calculating the weight of TMT bars is essential for budgeting, structural safety, and procurement planning. By using the formula (d²/162) and referring to standard weight charts, one can easily determine the weight and quantity required. For builders, engineers, and homeowners, this ensures smooth construction without cost overruns or shortages.
For bulk orders, price inquiries, or expert consultation on TMT bar requirements, contact:
📞 Pahari Home Solutions Pvt. Ltd.
Trusted dealer & distributor of TMT Bars in West Bengal
📱 Call/WhatsApp: +91 7584055356
🌐 Website: paharihomesolutions.in